forked from tdwojak/Python2019
406 lines
8.6 KiB
Plaintext
406 lines
8.6 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"# Podstawy Pythona: cz. 3\n",
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"\n",
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" \n",
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"\n",
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"## 27 stycznia 2019"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"## Co już było?\n",
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" * podstawowe typy danych\n",
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" * operacje arytmetyczne\n",
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" * wyświtlanie na ekran\n",
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" * pętla `for`, instrukcja `if`\n",
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" * listy i słowniki"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"## Funkcje\n",
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"\n",
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" * znamy kilka funkcji, np. print, len\n",
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" * funckje w pythonie nie odbiegają od funkcji w innych językach\n",
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" * może istnieć tylko 1 funkcja o danej nazwie"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [],
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"source": [
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"def nazwa_funkcji(argument1, argument2, argument3):\n",
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" # instrukcje do wykoniania\n",
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" return wartosc"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"True\n"
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]
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}
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],
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"source": [
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"def is_greater_than_5(x):\n",
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" if x > 5:\n",
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" return True\n",
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" else:\n",
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" return False\n",
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" \n",
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"print(is_greater_than_5(10))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"8.0\n"
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]
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}
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],
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"source": [
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"def srednia(lista):\n",
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" s = 0\n",
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" for item in lista:\n",
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" s += item\n",
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" return s / len(lista) \n",
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"\n",
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"print(srednia([7,8,9]))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [],
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"source": [
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"def count(lista, item):\n",
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" l = 0\n",
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" for i in lista:\n",
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" if i == item:\n",
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" l += 1\n",
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" return l"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 12,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"3"
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]
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},
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"execution_count": 12,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"count([3,3,3,4], 3)\n",
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"count(lista=[3,3,3,4], item=3)\n",
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"count(item=3, lista=[3,3,3,4])"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 15,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [],
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"source": [
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"def is_grater_than(x, y=0):\n",
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" if x > y:\n",
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" return True\n",
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" else:\n",
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" return False"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 16,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"False"
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]
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},
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"execution_count": 16,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"is_grater_than(5)\n",
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"is_grater_than(x=5)\n",
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"is_grater_than(5, 0)\n",
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"is_grater_than(5, 6)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 17,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"['a', 'b', 'c', 'd']\n"
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]
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}
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],
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"source": [
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"def alfaRange(x, y):\n",
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" for i in range(ord(x), ord(y)):\n",
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" yield chr(i)\n",
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"print(list(alfaRange('a', 'e')))"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"## Operacje na plikach"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [],
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"source": [
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"plik = open(\"haslo.txt\", 'r')\n",
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"for linia in plik.readlines():\n",
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" print(linia.strip())\n",
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"print(\">>\")\n",
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"plik.close()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 18,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [
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{
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"ename": "FileNotFoundError",
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"evalue": "[Errno 2] No such file or directory: 'haslo.txt'",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mFileNotFoundError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-18-c98a6e23ed86>\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\"haslo.txt\"\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m'r'\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[0;34m\u001b[0m\u001b[0m\n\u001b[0m\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[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[0;34m\u001b[0m\u001b[0m\n",
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"\u001b[0;31mFileNotFoundError\u001b[0m: [Errno 2] No such file or directory: 'haslo.txt'"
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]
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}
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],
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"source": [
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"with open(\"haslo.txt\", 'r') as plik:\n",
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" for linia in plik.readlines():\n",
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" print(linia)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 19,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [],
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"source": [
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"with open(\"haslo2.txt\", 'w') as plik:\n",
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" for word in ('corect', 'horse', 'battery', 'staple'):\n",
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" plik.write(word)\n",
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" plik.write('\\n')\n",
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"with open(\"haslo2.txt\", 'w+') as plik:\n",
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" plik.writelines([' '.join(('corect', 'horse', 'battery', 'staple'))])"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"## Korzystanie z bibliotek"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 20,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"posix\n",
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"Nazwa uzytkownika: tomasz\n"
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]
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}
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],
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"source": [
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"import os\n",
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"print(os.name)\n",
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"\n",
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"from os import getenv\n",
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"print('Nazwa uzytkownika: {}'.format(getenv(\"USER\")))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 21,
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"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"
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]
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},
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{
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"data": {
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"text/plain": [
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"array([[1., 3., 4., 5.]], dtype=float32)"
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]
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},
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"execution_count": 21,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"from collections import *\n",
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"print(Counter(\"konstantynopolitańczykowianeczka\"))\n",
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"\n",
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"import numpy as np\n",
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"np.array([[1, 3, 4, 5]], dtype='float32')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"celltoolbar": "Slideshow",
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.7.2"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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