Python2017/la/Podstawy 2.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "# Python: podstaw ciąg dalszy\n",
    "\n",
    "## Tomasz Dwojak\n",
    "\n",
    "### 2 grudnia 2017"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Co już znamy?\n",
    " * podstawowe typy danych i operacje na nich\n",
    " * Instrukcje sterujące: ``if``, ``for``\n",
    " * pisanie funkcji\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "fragment"
    }
   },
   "source": [
    "## Co na dziś?\n",
    "\n",
    " * ``tuple`` i ``set``,\n",
    " * operacje na plikach,\n",
    " * coś więcej o funkcjach\n",
    " * korzystanie z bibliotek\n",
    " * przegląd najważniejszych bibliotek"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "outputs": [],
   "source": [
    "def dwojak(x): x *= 2\n",
    "    \n",
    "l = [1, 2, 3]\n",
    "s = \"123\"\n",
    "\n",
    "dwojak(l)\n",
    "dwojak(s)\n",
    "\n",
    "print(l)\n",
    "print(s)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Mutable i Immutable\n",
    "\n",
    "### Mutable\n",
    " * listy,\n",
    " * słowniki,\n",
    " * sety,\n",
    " * własnoręcznie zdefiniowane klasy.\n",
    " \n",
    "### Immutable\n",
    " * liczby: inty i floaty,\n",
    " * napisy,\n",
    " * tuple."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Nieoczywistości"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "outputs": [],
   "source": [
    "def dwojak1(x): x *= 2\n",
    "def dwojak2(x): x = x * 2\n",
    "\n",
    "l = [1,2, 3]\n",
    "dwojak1(l)\n",
    "print(l)\n",
    "\n",
    "l = [1,2, 3]\n",
    "dwojak2(l)\n",
    "print(l)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "outputs": [],
   "source": [
    "l = [1, 2, 3]\n",
    "e = l\n",
    "e.append(4)\n",
    "print(l)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "outputs": [],
   "source": [
    "e = []\n",
    "f = [e for i in range(3)]\n",
    "f[0].append(1)\n",
    "print(f)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## To może ``tuple``?\n",
    " * stały rozmiar,\n",
    " * immutable,\n",
    " * mogą być kluczami w słownikach"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "outputs": [],
   "source": [
    "t = (1, \"napis\", None)\n",
    "elem = t[0]\n",
    "print(t)\n",
    "print(len(t))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Funkcje cz. 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "fragment"
    }
   },
   "outputs": [],
   "source": [
    "def suma(*args):\n",
    "    return sum(args)\n",
    "print(suma(1,2,3,4,5))\n",
    "\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",
    "greet_me(a=1, b=(3,4))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Generatory"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "fragment"
    }
   },
   "outputs": [],
   "source": [
    "def alfaRange(x, y):\n",
    "    for i in range(ord(x), ord(y)):\n",
    "        yield chr(i)\n",
    "\n",
    "for c in alfaRange('a', 'e'):\n",
    "    print(c)\n",
    "    ##druga wersja; w Pythonie3 f range rozni sie od 2\n",
    "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",
    "    print(c)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Operacje na plikach"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "fragment"
    }
   },
   "outputs": [],
   "source": [
    "plik = open(\"haslo.txt\", 'r') ## r - read only\n",
    "for linia in plik.readlines():\n",
    "    print(linia.strip())\n",
    "print(plik.read())\n",
    "print(\">>\")\n",
    "plik.close() ## jesli nie uzyjemy tej funkcji przy duzej liczbie plikow, to skoncza sie deskryptory"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "outputs": [],
   "source": [
    "with open(\"haslo.txt\", 'r') as plik: ## wygodne do pracy z plikami\n",
    "    for linia in plik.readlines():\n",
    "        print(linia)\n",
    "# print(plik.read()) ##nie trzeba zamykac plikow"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true,
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "outputs": [],
   "source": [
    "with open(\"haslo2.txt\", 'w') as plik: ## write - zapis do pliku\n",
    "    for word in ('corect', 'horse', 'battery', 'staple'):\n",
    "        plik.write(word)\n",
    "    plik.write('\\n')\n",
    "with open(\"haslo2.txt\", 'w+') as plik:\n",
    "    plik.writelines([' '.join(('corect', 'horse', 'battery', 'staple'))])"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "# Korzystanie z modułów"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Importowanie"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "fragment"
    }
   },
   "outputs": [],
   "source": [
    "import os  ##ta biblioteka pozwala na operacje na systemie operacyjnym\n",
    "print(os.name)\n",
    "\n",
    "from os import getenv\n",
    "print('Nazwa uzytkownika: {}'.format(getenv(\"USER\")))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "outputs": [],
   "source": [
    "from collections import *\n",
    "print(Counter(\"konstantynopolitańczykowianeczka\"))\n",
    "\n",
    "import numpy as np\n",
    "np.array([[1, 3, 4, 5]], dtype='float32')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true,
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Instalacja\n",
    "\n",
    " * lokalnie (per użytkownik) lub globalnie\n",
    " * pyCharm lub linia komend, np. ``pip install --user flask`` lub ``python -m pip install --user flask``"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Wczytywanie z klawiatury"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "fragment"
    }
   },
   "outputs": [],
   "source": [
    "name = input(\"What's your name?\\n\")\n",
    "print(\"Welcome home, {}.\".format(name))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "outputs": [],
   "source": [
    "liczby = eval(input(\"Podaj liczby\"))\n",
    "print(sum(liczby))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "## Co ominąłem?\n",
    "\n",
    " * klasy (jutro)\n",
    " * podział programu na pliki (jutro)\n",
    " "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "celltoolbar": "Slideshow",
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.3"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}