diff --git a/labs01/podstawy.ipynb b/labs01/podstawy.ipynb
index 6146f07..964b9d2 100644
--- a/labs01/podstawy.ipynb
+++ b/labs01/podstawy.ipynb
@@ -54,7 +54,7 @@
     "print(3.14)\n",
     "print(123456789 * 987654321)\n",
     "print(10 ** 20)\n",
-    "print(12 ** (3 + 4 *(567 % 8) / 9))\n",
+    "print(12 ** (3 + 4 *(567 % 8) / 9)) # % modulo\n",
     "print(\"PI\",  \"jest równe \", 3.1415)"
    ]
   },
@@ -159,6 +159,27 @@
     "print(type(czy_lubie_pythona))"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
   {
    "cell_type": "markdown",
    "metadata": {
@@ -621,6 +642,13 @@
     "    print(znak, ord(znak))"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
   {
    "cell_type": "code",
    "execution_count": null,
diff --git a/labs01/wprowadzenie.ipynb b/labs01/wprowadzenie.ipynb
index 0371781..af5f0fb 100644
--- a/labs01/wprowadzenie.ipynb
+++ b/labs01/wprowadzenie.ipynb
@@ -31,21 +31,6 @@
     " * Prawie 10-letnia przygoda z Pythonem"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {
-    "slideshow": {
-     "slide_type": "slide"
-    }
-   },
-   "source": [
-    "## Warunki zaliczenia\n",
-    " * Od tej edycji zajęcia z Pythona są osobnym przedmiotem.\n",
-    " * Ocena na podstawie zadań domowych.\n",
-    " * Termin na zadania domowe to prawie 2 tygodnie.\n",
-    " * Więcej na drugiej godzinie zajęć."
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {
@@ -113,6 +98,31 @@
     " Motywacje zaczerpnięte m.in. z [5 Reasons why Python is Powerful Enough for Google](https://www.codefellows.org/blog/5-reasons-why-python-is-powerful-enough-for-google)."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": []
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "source": [
+    "## Warunki zaliczenia\n",
+    " * Od tej edycji zajęcia z Pythona są osobnym przedmiotem.\n",
+    " * Ocena na podstawie zadań domowych.\n",
+    " * Termin na zadania domowe to prawie 2 tygodnie.\n",
+    " * Więcej na drugiej godzinie zajęć."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": []
+  },
   {
    "cell_type": "code",
    "execution_count": null,
diff --git a/labs03/Podstawy 2.ipynb b/labs03/Podstawy 2.ipynb
index adf5795..e8679c1 100644
--- a/labs03/Podstawy 2.ipynb	
+++ b/labs03/Podstawy 2.ipynb	
@@ -49,34 +49,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": null,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
     }
    },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "2\n",
-      "[1, 2, 3, 1, 2, 3]\n",
-      "123\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
-    "def dwojak(x): \n",
-    "    x *= 2\n",
-    "    return x\n",
+    "def dwojak(x): x *= 2\n",
     "    \n",
     "l = [1, 2, 3]\n",
     "s = \"123\"\n",
     "\n",
     "dwojak(l)\n",
     "dwojak(s)\n",
-    "print(dwojak(1))\n",
+    "\n",
     "print(l)\n",
     "print(s)"
    ]
@@ -116,7 +104,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 2,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -127,17 +115,13 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "[1, 2, 3, 1, 2, 3]\n",
-      "F: [1, 2, 3, 1, 2, 3]\n",
-      "[1, 2, 3]\n"
+      "[1, 2, 3, 1, 2, 3]\n[1, 2, 3]\n"
      ]
     }
    ],
    "source": [
     "def dwojak1(x): x *= 2\n",
-    "def dwojak2(x): \n",
-    "    x = x * 2\n",
-    "    print(\"F:\", x)\n",
+    "def dwojak2(x): x = x * 2\n",
     "\n",
     "l = [1,2, 3]\n",
     "dwojak1(l)\n",
@@ -150,7 +134,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 3,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -161,22 +145,20 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "[1, 2, 3]\n",
       "[1, 2, 3, 4]\n"
      ]
     }
    ],
    "source": [
     "l = [1, 2, 3]\n",
-    "e = l[:]\n",
+    "e = l\n",
     "e.append(4)\n",
-    "print(l)\n",
-    "print(e)"
+    "print(l)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": 4,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -214,7 +196,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": 5,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -225,28 +207,15 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "(1, 'napis', [0])\n",
-      "3\n"
-     ]
-    },
-    {
-     "ename": "TypeError",
-     "evalue": "unhashable type: 'list'",
-     "output_type": "error",
-     "traceback": [
-      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-25-2bd2fa17fbf5>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      3\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mt\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      4\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mlen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mt\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 5\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m{\u001b[0m\u001b[0mt\u001b[0m\u001b[0;34m:\u001b[0m \u001b[0;32mNone\u001b[0m\u001b[0;34m}\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-      "\u001b[0;31mTypeError\u001b[0m: unhashable type: 'list'"
+      "(1, 'napis', None)\n3\n"
      ]
     }
    ],
    "source": [
-    "t = (1, \"napis\", [])\n",
-    "t[-1].append(0)\n",
+    "t = (1, \"napis\", None)\n",
+    "elem = t[0]\n",
     "print(t)\n",
-    "print(len(t))\n",
-    "print({t: None})"
+    "print(len(t))"
    ]
   },
   {
@@ -262,7 +231,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 36,
+   "execution_count": 6,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -273,9 +242,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "15\n",
-      "a == 1\n",
-      "b == (3, 4)\n"
+      "15\na == 1\nb == (3, 4)\n"
      ]
     }
    ],
@@ -284,7 +251,7 @@
     "    return sum(args)\n",
     "print(suma(1,2,3,4,5))\n",
     "\n",
-    "def greet_me(z=None,**kwargs):\n",
+    "def greet_me(**kwargs):\n",
     "    if kwargs is not None:\n",
     "        for key, value in kwargs.items():\n",
     "            print(\"%s == %s\" %(key,value))\n",
@@ -304,7 +271,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 38,
+   "execution_count": 7,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -315,21 +282,13 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "97\n",
-      "a\n",
-      "98\n",
-      "b\n",
-      "99\n",
-      "c\n",
-      "100\n",
-      "d\n"
+      "a\nb\nc\nd\n"
      ]
     }
    ],
    "source": [
     "def alfaRange(x, y):\n",
     "    for i in range(ord(x), ord(y)):\n",
-    "        print(i)\n",
     "        yield chr(i)\n",
     "\n",
     "for c in alfaRange('a', 'e'):\n",
@@ -349,7 +308,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 45,
+   "execution_count": 8,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -360,63 +319,37 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "W Paryżu najlepsze kasztany są na placu Pigalle\n",
-      "Zuzanna lubi je tylko jesienią.\n",
-      "\n",
-      ">>\n"
+      "W Paryżu najlepsze kasztany są na placu Pigalle\nZuzanna lubi je tylko jesienią.\n\n"
      ]
     }
    ],
    "source": [
-    "plik = open(\"haslo.txt\", 'r')\n",
+    "plik = open(\"J:\\PycharmProjects\\Python2017\\labs03\\haslo.txt\", 'r')\n",
     "for linia in plik.readlines():\n",
     "    print(linia.strip())\n",
-    "print(plik.read())\n",
-    "print(\">>\")\n",
+    "print(plik.read()) # odczytuje \n",
     "plik.close()"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 47,
+   "execution_count": null,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
     }
    },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "W Paryżu najlepsze kasztany są na placu Pigalle\n",
-      "\n",
-      "Zuzanna lubi je tylko jesienią.\n",
-      "\n"
-     ]
-    },
-    {
-     "ename": "ValueError",
-     "evalue": "I/O operation on closed file.",
-     "output_type": "error",
-     "traceback": [
-      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-47-f06513c1bbec>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      2\u001b[0m     \u001b[0;32mfor\u001b[0m \u001b[0mlinia\u001b[0m \u001b[0;32min\u001b[0m \u001b[0mplik\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mreadlines\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      3\u001b[0m         \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mlinia\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 4\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mplik\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mread\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-      "\u001b[0;31mValueError\u001b[0m: I/O operation on closed file."
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "with open(\"haslo.txt\", 'r') as plik:\n",
     "    for linia in plik.readlines():\n",
     "        print(linia)\n",
-    "print(plik.read())"
+    "# print(plik.read())"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 48,
+   "execution_count": null,
    "metadata": {
     "collapsed": true,
     "slideshow": {
@@ -457,22 +390,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 49,
+   "execution_count": null,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
     }
    },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "posix\n",
-      "Nazwa uzytkownika: tomaszd\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "import os\n",
     "print(os.name)\n",
@@ -483,31 +407,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 50,
+   "execution_count": null,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
     }
    },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Counter({'o': 4, 'n': 4, 'a': 4, 'k': 3, 't': 3, 'y': 2, 'i': 2, 'c': 2, 'z': 2, 's': 1, 'p': 1, 'l': 1, 'ń': 1, 'w': 1, 'e': 1})\n"
-     ]
-    },
-    {
-     "data": {
-      "text/plain": [
-       "array([[ 1.,  3.,  4.,  5.]], dtype=float32)"
-      ]
-     },
-     "execution_count": 50,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
+   "outputs": [],
    "source": [
     "from collections import *\n",
     "print(Counter(\"konstantynopolitańczykowianeczka\"))\n",
@@ -544,23 +450,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 51,
+   "execution_count": null,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
     }
    },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "What's your name?\n",
-      "Tomasz\n",
-      "Welcome home, Tomasz.\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "name = input(\"What's your name?\\n\")\n",
     "print(\"Welcome home, {}.\".format(name))"
diff --git a/labs03/task01.py b/labs03/task01.py
new file mode 100644
index 0000000..e360adf
--- /dev/null
+++ b/labs03/task01.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+lista = [1,2,3,4,5]
+print("lista ma id: {}".format(id(lista)))
+lista *= 10
+lista.append(6)
+print("lista ma id: {}".format(id(lista)))
+lista.pop(2)
+print("lista ma id: {}".format(id(lista)))
+
+
+lancuch = "a string"
+print("lancuch ma id: {}".format(id(lancuch)))
+lancuch.capitalize()
+print("lancuch ma id: {}".format(id(lancuch)))
+lancuch += "!"
+print("lancuch ma id: {}".format(id(lancuch)))
+
+liczba = 5.2
+print("liczba ma id: {}".format(id(liczba)))
+liczba += 2.3
+print("liczba ma id: {}".format(id(liczba)))
diff --git a/labs03/task02.py b/labs03/task02.py
new file mode 100644
index 0000000..186f240
--- /dev/null
+++ b/labs03/task02.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+def Fibb(n):
+    f_1 = 1
+    f_2 = 1
+    for i in range(0, n):
+        f_3 = f_1 + f_2
+        yield f_1
+        f_1 = f_2
+        f_2 = f_3
+
+for c in Fibb(10):
+    print(c)
\ No newline at end of file
diff --git a/labs03/task03.py b/labs03/task03.py
new file mode 100644
index 0000000..80c184f
--- /dev/null
+++ b/labs03/task03.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+import requests,json
+
+# pobieram zawartość JSON wykorzystując bibliotekę 'requests'
+r = requests.get('https://api.fixer.io/latest')
+if r.status_code == 200:
+    # korzystając z biblioteki ``json`` przekształcamy go do obiektu typu JSON.
+    decoded_js = json.loads(r.text)
+
+    print('Kurs EUR do PLN wynosi {}'.format(decoded_js['rates']['PLN']))
+
diff --git a/labs03/task04.py b/labs03/task04.py
new file mode 100644
index 0000000..08bbad8
--- /dev/null
+++ b/labs03/task04.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+import weather,datetime
+
+def FahrenheitToCelsius(fahrenheit):
+    return (fahrenheit - 32) / 1.8
+    #return round((fahrenheit - 32) / 1.8, 1)
+
+def dzien_tygodnia(data):
+    dni_tygodnia = ["poniedziałek",
+                    "wtorek",
+                    "środa",
+                    "czwartek",
+                    "piatek",
+                    "sobotę",
+                    "niedzielę"]
+    return dni_tygodnia[data.weekday()]
+
+def miesiaca(data):
+    miesiace = ["stycznia",
+                "lutego",
+                "marca",
+                "kwietnia",
+                "maja",
+                "czerwca",
+                "lipca",
+                "śierpnia",
+                "września",
+                "października",
+                "listopada",
+                "grudnia"]
+    return miesiace[data.month-1]
+
+
+pogoda = weather.Weather()
+
+# Yahoo! WOEID dla miasta Poznań 514048
+
+#miejsce = pogoda.lookup(514048)
+#stan = miejsce.condition()
+#print(stan.text())
+
+# Lookup poprzez podanie nazwy miasta
+
+miejsce = pogoda.lookup_by_location('Poznań')
+stan = miejsce.condition()
+#print(stan.text())
+
+# prognozy na nadchodzące dni
+prognozy = miejsce.forecast()
+#print(prognozy)
+
+# wybieram dzień z prognozy pogody w którym bedzie najzimniej
+najzimniejszy = min(prognozy, key = lambda prognozy : prognozy.low())
+
+# konwerstuję string na format czasu
+datetime_object = datetime.datetime.strptime(najzimniejszy.date(), '%d %b %Y')
+
+#print(datetime_object.get_weekday())
+#print(FahrenheitToCelsius(float(najzimniejszy.high())))
+#print(FahrenheitToCelsius(float(najzimniejszy.low())))
+
+# korzystając z prognozy, wypisuję dzień, w którym będzie najzimniej.
+#
+#print 'W {}'.format(dzien_tygodnia(datetime_object))+ ' ' + str(datetime_object.day) + ' ' + miesiaca(datetime_object) + ' ' + str(datetime_object.year) + ' będzie najchłodniej, najniższa możliwa temperatura może wynieść {}'.format(round(FahrenheitToCelsius(float(najzimniejszy.low())),1)) + ' °C'
+
+wydruk = 'W {dt} {d} {m} {r} będzie najchłodniej, najniższa możliwa temperatura może wynieść {t:.1f} °C'
+
+print wydruk.format(dt=dzien_tygodnia(datetime_object),d=str(datetime_object.day), m=miesiaca(datetime_object), r=str(datetime_object.year), t=FahrenheitToCelsius(float(najzimniejszy.low())))
\ No newline at end of file
diff --git a/labs03/task05.py b/labs03/task05.py
new file mode 100644
index 0000000..1293e85
--- /dev/null
+++ b/labs03/task05.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+import glob
+
+# funkcja, która wydobywa wartości miary BLEU z pliku o podanej ścieżce
+def BLEU(sciezka):
+    with open(sciezka, 'r') as plik:
+        for linia in plik.readlines():
+            lancuch = linia.strip()
+            #print sciezka + lancuch
+            return float(lancuch.partition(',')[0].partition('=')[2])
+
+# znajduję nazwę pliku z maksymalną wartościa miary BLEU korzystając z iteratora ścieżek
+# do plików o podanej postaci oraz funkcji BLEU
+#
+#print max(glob.iglob('scores/model.iter*.npz.bleu'), key = BLEU).partition('\\')[2]
+#
+sciezka = max(glob.iglob('scores/model.iter*.npz.bleu'), key = BLEU)
+print 'Największa wartość mary BLEU wynosząca {1} znajduje się w pliku {0}'.format(sciezka.partition('\\')[2],BLEU(sciezka))
\ No newline at end of file
diff --git a/labs04/Klasy.ipynb b/labs04/Klasy.ipynb
index 1cd0a99..14040d4 100644
--- a/labs04/Klasy.ipynb
+++ b/labs04/Klasy.ipynb
@@ -43,7 +43,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 1,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -54,8 +54,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "0\n",
-      "Python da się lubić !\n"
+      "0\nPython da się lubić !\n"
      ]
     }
    ],
@@ -77,7 +76,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 18,
+   "execution_count": 6,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -88,7 +87,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "<class '__main__.NajprostszaKlasa'>\n"
+      "<type 'instance'>\n<type 'instance'>\n"
      ]
     }
    ],
@@ -97,7 +96,10 @@
     "    pass\n",
     "\n",
     "nasza_klasa = NajprostszaKlasa() # Uwaga na nawiasy na końcu!\n",
-    "print(type(nasza_klasa))"
+    "print(type(nasza_klasa))\n",
+    "\n",
+    "nasza_klasa = NajprostszaKlasa # Uwaga na nawiasy na końcu!\n",
+    "print(type(nasza_klasa()))"
    ]
   },
   {
@@ -114,7 +116,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 30,
+   "execution_count": 14,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -125,23 +127,26 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "2\n"
+      "2\n<__main__.Punkt instance at 0x00000000049B3CC8>\n"
      ]
     }
    ],
    "source": [
     "class Punkt:\n",
-    "    def __init__(self, x, y):\n",
+    "    def __init__(self, x, y=0):\n",
     "        self.x = x\n",
     "        self.y = y\n",
+    "        \n",
+    "# self jak this w C\n",
     "\n",
-    "punkt = Punkt(2, 3)\n",
-    "print(punkt.x)"
+    "punkt = Punkt(2)\n",
+    "print(punkt.x)\n",
+    "print(punkt)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": 20,
    "metadata": {
     "collapsed": true,
     "slideshow": {
@@ -157,13 +162,16 @@
     "    def liczba_wierzcholkow(self):\n",
     "        return len(self.vertexes)\n",
     "    \n",
+    "    #metoda - jedynym argumentem jest self\n",
+    "    #funkcja - \n",
+    "    \n",
     "    def dodaj_wierzcholek(self, x):\n",
     "        self.vertexes.append(x)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": 22,
    "metadata": {
     "collapsed": true,
     "slideshow": {
@@ -172,10 +180,12 @@
    },
    "outputs": [],
    "source": [
+    "#dziedziczenie\n",
+    "\n",
     "class Prostokat(Figura):\n",
     "    def __init__(self, vertexes):\n",
     "        super().__init__(vertexes)\n",
-    "        \n",
+    "        #lub self.vertexes = vertexes\n",
     "    def czy_jestem_kwadratem(self):\n",
     "        pass\n",
     "        "
@@ -183,7 +193,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
+   "execution_count": 41,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -196,7 +206,7 @@
        "3"
       ]
      },
-     "execution_count": 28,
+     "execution_count": 41,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -212,7 +222,11 @@
     "    def __len__(self):\n",
     "        return self.liczba_wierzcholkow()\n",
     "    \n",
-    "len(Figura([Punkt(2,3), Punkt(3,4), Punkt(0, 0)]))"
+    "len(Figura([Punkt(2,3), Punkt(3,4), Punkt(0, 0)]))\n",
+    "o = Figura([Punkt(2,3), Punkt(3,4), Punkt(0, 0)])\n",
+    "len(o)\n",
+    "o.__len__()\n",
+    "o.liczba_wierzcholkow()"
    ]
   },
   {
@@ -228,7 +242,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 33,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -246,7 +260,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 34,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -257,25 +271,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Help on class Punkt in module __main__:\n",
-      "\n",
-      "class Punkt(builtins.object)\n",
-      " |  Klasa reprezentująca punkt w 2D.\n",
-      " |  \n",
-      " |  Methods defined here:\n",
-      " |  \n",
-      " |  __init__(self, x, y)\n",
-      " |      opis argumentów x i y.\n",
-      " |  \n",
-      " |  ----------------------------------------------------------------------\n",
-      " |  Data descriptors defined here:\n",
-      " |  \n",
-      " |  __dict__\n",
-      " |      dictionary for instance variables (if defined)\n",
-      " |  \n",
-      " |  __weakref__\n",
-      " |      list of weak references to the object (if defined)\n",
-      "\n"
+      "Help on class Punkt in module __main__:\n\nclass Punkt(__builtin__.object)\n |  Klasa reprezentująca punkt w 2D.\n |  \n |  Methods defined here:\n |  \n |  __init__(self, x, y)\n |      opis argumentów x i y.\n |  \n |  ----------------------------------------------------------------------\n |  Data descriptors defined here:\n |  \n |  __dict__\n |      dictionary for instance variables (if defined)\n |  \n |  __weakref__\n |      list of weak references to the object (if defined)\n\n"
      ]
     }
    ],
@@ -309,13 +305,13 @@
     {
      "ename": "AttributeError",
      "evalue": "'Parser' object has no attribute '__parse'",
-     "output_type": "error",
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mAttributeError\u001b[0m                            Traceback (most recent call last)",
       "\u001b[0;32m<ipython-input-6-80ee186598d3>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      4\u001b[0m \u001b[0mparser\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mParser\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      5\u001b[0m \u001b[0mparser\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_get\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 6\u001b[0;31m \u001b[0mparser\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m__parse\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
       "\u001b[0;31mAttributeError\u001b[0m: 'Parser' object has no attribute '__parse'"
-     ]
+     ],
+     "output_type": "error"
     }
    ],
    "source": [
@@ -340,7 +336,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 42,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -348,13 +344,15 @@
    },
    "outputs": [
     {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "<__main__.Punkt object at 0x7f728015b358>\n",
-      "<__main__.Punkt object at 0x7f728015b4a8>\n",
-      "<__main__.Punkt object at 0x7f728015b438>\n"
-     ]
+     "ename": "TypeError",
+     "evalue": "instance has no next() method",
+     "traceback": [
+      "\u001b[1;31m\u001b[0m",
+      "\u001b[1;31mTypeError\u001b[0mTraceback (most recent call last)",
+      "\u001b[1;32m<ipython-input-42-c424f51c19dc>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m     13\u001b[0m         \u001b[1;32mreturn\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mvertexes\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mindex\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     14\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 15\u001b[1;33m \u001b[1;32mfor\u001b[0m \u001b[0mv\u001b[0m \u001b[1;32min\u001b[0m \u001b[0mFigura\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0mPunkt\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m2\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m3\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mPunkt\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m3\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m4\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mPunkt\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m0\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     16\u001b[0m     \u001b[1;32mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mv\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
+      "\u001b[1;31mTypeError\u001b[0m: instance has no next() method"
+     ],
+     "output_type": "error"
     }
    ],
    "source": [
@@ -390,7 +388,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 16,
+   "execution_count": 1,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -401,8 +399,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "0\n",
-      "0\n"
+      "79384200\n48959560\n0\n0\n"
      ]
     }
    ],
@@ -411,13 +408,23 @@
     "    atrybut = 0\n",
     "\n",
     "klasa = Klasa()\n",
-    "print(Klasa.atrybut)\n",
-    "print(klasa.atrybut)"
+    "#klasa2 = Klasa\n",
+    "#klasa2.atrybut=1\n",
+    "print(id(Klasa))\n",
+    "klasa2 = Klasa()\n",
+    "print(id(klasa2))\n",
+    "klasa2.atrybut=1\n",
+    "\n",
+    "print(Klasa.atrybut)  \n",
+    "#atrybut wspólny dla wszystkich instancji\n",
+    "print(klasa.atrybut)\n",
+    "\n",
+    "klasa.temp = []"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": 62,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -425,11 +432,15 @@
    },
    "outputs": [
     {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Jestem statyczna!\n"
-     ]
+     "ename": "TypeError",
+     "evalue": "unbound method metoda() must be called with Klasa instance as first argument (got nothing instead)",
+     "traceback": [
+      "\u001b[1;31m\u001b[0m",
+      "\u001b[1;31mTypeError\u001b[0mTraceback (most recent call last)",
+      "\u001b[1;32m<ipython-input-62-63152cc2cac6>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      6\u001b[0m         \u001b[1;32mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"Jestem statyczna!\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m \u001b[0mKlasa\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mmetoda\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
+      "\u001b[1;31mTypeError\u001b[0m: unbound method metoda() must be called with Klasa instance as first argument (got nothing instead)"
+     ],
+     "output_type": "error"
     }
    ],
    "source": [
@@ -437,6 +448,7 @@
     "    def __init__(self):\n",
     "        self.t = 0\n",
     "    def metoda():\n",
+    "        # nie będzie działać self.t = 0\n",
     "        print(\"Jestem statyczna!\")\n",
     "\n",
     "Klasa.metoda()"
@@ -455,7 +467,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": 1,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -463,15 +475,15 @@
    },
    "outputs": [
     {
-     "ename": "FileNotFoundError",
-     "evalue": "[Errno 2] No such file or directory: 'nieistniejący_plik.txt'",
-     "output_type": "error",
+     "ename": "IOError",
+     "evalue": "[Errno 2] No such file or directory: 'nieistniej\\xc4\\x85cy_plik.txt'",
      "traceback": [
-      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[0;31mFileNotFoundError\u001b[0m                         Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-20-41928d542bef>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;32mwith\u001b[0m \u001b[0mopen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"nieistniejący_plik.txt\"\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;32mas\u001b[0m \u001b[0mplik\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      2\u001b[0m     \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mplik\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mread\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-      "\u001b[0;31mFileNotFoundError\u001b[0m: [Errno 2] No such file or directory: 'nieistniejący_plik.txt'"
-     ]
+      "\u001b[1;31m\u001b[0m",
+      "\u001b[1;31mIOError\u001b[0mTraceback (most recent call last)",
+      "\u001b[1;32m<ipython-input-1-1bebecf2f5c5>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[1;32mwith\u001b[0m \u001b[0mopen\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"nieistniejący_plik.txt\"\u001b[0m\u001b[1;33m)\u001b[0m \u001b[1;32mas\u001b[0m \u001b[0mplik\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      2\u001b[0m     \u001b[0mcontent\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mplik\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mread\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
+      "\u001b[1;31mIOError\u001b[0m: [Errno 2] No such file or directory: 'nieistniej\\xc4\\x85cy_plik.txt'"
+     ],
+     "output_type": "error"
     }
    ],
    "source": [
@@ -481,7 +493,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 23,
+   "execution_count": 31,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -489,6 +501,8 @@
    },
    "outputs": [],
    "source": [
+    "from pandas.compat import FileNotFoundError\n",
+    "\n",
     "try:\n",
     "    with open(\"nieistniejący_plik.txt\") as plik:\n",
     "        content = plik.read()\n",
@@ -498,7 +512,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": 32,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -509,7 +523,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Warning [Errno 2] No such file or directory: 'nieistniejący_plik.txt'\n"
+      "Warning [Errno 2] No such file or directory: 'nieistniej\\xc4\\x85cy_plik.txt'\n"
      ]
     }
    ],
@@ -524,7 +538,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
+   "execution_count": 13,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"
@@ -535,7 +549,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Warning [Errno 2] No such file or directory: 'nieistniejący_plik.txt'\n"
+      "Warning [Errno 2] No such file or directory: 'nieistniej\\xc4\\x85cy_plik.txt'\n"
      ]
     }
    ],
@@ -550,7 +564,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 29,
+   "execution_count": 14,
    "metadata": {
     "collapsed": true,
     "slideshow": {
@@ -568,25 +582,40 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 30,
+   "execution_count": 19,
    "metadata": {
     "collapsed": true,
     "slideshow": {
      "slide_type": "slide"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "ename": "Exception",
+     "evalue": "Empty list of vertexes",
+     "traceback": [
+      "\u001b[1;31m\u001b[0m",
+      "\u001b[1;31mException\u001b[0mTraceback (most recent call last)",
+      "\u001b[1;32m<ipython-input-19-0884e4d4e2f2>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      5\u001b[0m         \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mvertexes\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mvertexes\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 7\u001b[1;33m \u001b[0mfigura\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mFigura\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
+      "\u001b[1;32m<ipython-input-19-0884e4d4e2f2>\u001b[0m in \u001b[0;36m__init__\u001b[1;34m(self, vertexes)\u001b[0m\n\u001b[0;32m      2\u001b[0m     \u001b[1;32mdef\u001b[0m \u001b[0m__init__\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mvertexes\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      3\u001b[0m         \u001b[1;32mif\u001b[0m \u001b[0mlen\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mvertexes\u001b[0m\u001b[1;33m)\u001b[0m \u001b[1;33m==\u001b[0m \u001b[1;36m0\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 4\u001b[1;33m             \u001b[1;32mraise\u001b[0m \u001b[0mException\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"Empty list of vertexes\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      5\u001b[0m         \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mvertexes\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mvertexes\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
+      "\u001b[1;31mException\u001b[0m: Empty list of vertexes"
+     ],
+     "output_type": "error"
+    }
+   ],
    "source": [
     "class Figura:\n",
     "    def __init__(self, vertexes):\n",
     "        if len(vertexes) == 0:\n",
     "            raise Exception(\"Empty list of vertexes\")\n",
-    "        self.vertexes = vertexes"
+    "        self.vertexes = vertexes\n",
+    "        \n",
+    "figura = Figura([])"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 35,
+   "execution_count": 27,
    "metadata": {
     "collapsed": true,
     "slideshow": {
@@ -604,7 +633,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 36,
+   "execution_count": 34,
    "metadata": {
     "slideshow": {
      "slide_type": "fragment"
@@ -614,13 +643,13 @@
     {
      "ename": "MyError",
      "evalue": "Coś poszło nie tak!",
-     "output_type": "error",
      "traceback": [
-      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[0;31mMyError\u001b[0m                                   Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-36-4fb306b42ebc>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;32mraise\u001b[0m \u001b[0mMyError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Coś poszło nie tak!\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
-      "\u001b[0;31mMyError\u001b[0m: Coś poszło nie tak!"
-     ]
+      "\u001b[1;31m\u001b[0m",
+      "\u001b[1;31mMyError\u001b[0mTraceback (most recent call last)",
+      "\u001b[1;32m<ipython-input-34-99f654d8334c>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[1;32mraise\u001b[0m \u001b[0mMyError\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"Coś poszło nie tak!\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
+      "\u001b[1;31mMyError\u001b[0m: Coś poszło nie tak!"
+     ],
+     "output_type": "error"
     }
    ],
    "source": [
diff --git a/labs04/task01.py b/labs04/task01.py
index 88741a4..3f53b3e 100644
--- a/labs04/task01.py
+++ b/labs04/task01.py
@@ -1,3 +1,21 @@
 #!/usr/bin/env python2
 # -*- coding: utf-8 -*-
 
+import math
+
+
+def is_numeric(lista):
+    bool = False
+    for i in lista:
+        bool = isinstance(i, int) or isinstance(i, float)
+        if not bool:
+            return False
+    return bool
+
+print(is_numeric([-1,2.1,3]))
+
+print(is_numeric([-1,2.1, '3',3]))
+
+print(is_numeric(['2']))
+
+print(is_numeric([None]))
diff --git a/labs04/task02.py b/labs04/task02.py
index 88741a4..55fadf6 100644
--- a/labs04/task02.py
+++ b/labs04/task02.py
@@ -1,3 +1,57 @@
 #!/usr/bin/env python2
 # -*- coding: utf-8 -*-
 
+import random
+
+random.seed(a=0)
+
+# Klasa bazowa, która zawiera informacje o imieniu i nazwisku pracownika.
+# Każdy pracownik posiada unikatowy numer 'id'.
+class Employee:
+    # atrybut statyczny
+    id =  0
+    def __init__(self, firstname = 'Anonim', lastname = 'Gal'):
+            self.firstname = firstname
+            self.lastname = lastname
+            self.id = random.randrange(10000000, 50000000, 1)
+    # Metodę 'get_id', która zwraca identyfikator pracownika.
+    def get_id(self):
+        return self.id
+
+# Klasy pochodna posiadająca dodatkową metodę 'recruit', która jako parament przyjmuje
+# obiekt 'Employee' i zapisuje jego 'id' w liście 'self.recruited'.
+class Recruiter(Employee):
+    def recruit(self, employee):
+        self.recruited = employee.get_id()
+
+# Klasa pochodna przyjmuje w konstruktorze podstawowe informacje (imię i nazwisko)
+# oraz obiekt rekturera. Ponadto posiada ona atrybut 'recruiter', który będzie
+# przechowywał 'id' rekrutera.
+class Programmer(Recruiter):
+    def __init__(self, firstname, lastname, recruiter_obj):
+            self.firstname = firstname
+            self.lastname = lastname
+            self.recruiter = recruiter_obj
+            recruiter = recruiter_obj.recruited
+            self.id = random.randrange(50000000, 100000000, 1)
+
+
+pracownik = Employee('Jurek', 'P')
+print pracownik.get_id()
+
+rekruter = Recruiter('Kasia', 'P')
+print rekruter.get_id()
+
+rekruter.recruit(pracownik)
+print rekruter.get_id()
+
+programista = Programmer('Maciej', 'W', rekruter)
+print programista.get_id()
+
+rekruter.recruit(programista)
+print rekruter.get_id()
+
+print Employee.id
+
+
+
diff --git a/labs04/task03.py b/labs04/task03.py
index 88741a4..87a9e59 100644
--- a/labs04/task03.py
+++ b/labs04/task03.py
@@ -1,3 +1,75 @@
 #!/usr/bin/env python2
 # -*- coding: utf-8 -*-
 
+import math
+
+# klasa, która reprezentuje punkt w przestrzeni wielowymiarowej.
+class Point:
+
+    # konstruktor, który ma przyjmyje tylko 1 parametr: listę współrzednych.
+    def __init__(self,coordinates=[]):
+        if self.is_numeric(coordinates):
+            self.coordinates = coordinates
+        else:
+            self.coordinates = None
+
+    # funkcja sprawdzająca czy lista składa się z samych liczb.
+    def is_numeric(self, lista):
+        bool = False
+        for i in lista:
+            bool = isinstance(i, int) or isinstance(i, float)
+            if not bool:
+                return False
+        return bool
+
+    # metoda, która dodaje dwa punkty po współrzędnych i zwróci obiekt typu 'Punkt'.
+    def __add__(self, other):
+        if len(self) == len(other):
+            return Point(map((lambda x,y: x+y), self.coordinates, other.coordinates))
+        else:
+            raise DimensionError("Dodawany punkt ma inny wymiar!")
+
+    #  metoda zwracająca łancuch znakowy, który w czytelny sposób przedstawi punkt.
+    def to_string(self):
+        if self.coordinates == None:
+            return "()"
+        else:
+            return "(" + ", ".join(str(c) for c in self.coordinates) + ")"
+
+    # metoda, która zwróci liczbę współrzędnych punktu.
+    def __len__(self):
+        if self.coordinates is not None:
+            return len(self.coordinates)
+        else:
+            return 0
+
+    # metoda, która działa dokładnie tak samo jak metoda `to_string`.
+    def __str__(self):
+        return self.to_string()
+
+# wyjątek `DimensionError`, który zostaje wyrzucony, jeżeli dodawany punkt ma inny wymiar.
+class DimensionError(Exception):
+    def __init__(self, text="Błąd wymiaru!"):
+        self.text = text
+    def __str__(self):
+        return self.text
+
+p_0 = Point([])
+print(str(p_0))
+print(len(p_0))
+
+p_1 = Point([ 1, 3, 5])
+print(p_1)
+print(len(p_1))
+p_2 = Point([ 1, 2, 4])
+print(p_2)
+print(len(p_2))
+
+try:
+    p_sum = p_1.__add__(p_2)
+    print(p_sum)
+    print(len(p_sum))
+    #print(len(str(p_1.__add__(p_2))))
+    p_sum = p_0.__add__(p_1)
+except Exception as ex:
+    print("Warning: {}".format(ex))
\ No newline at end of file