|
| 1 | +{ |
| 2 | + "cells": [ |
| 3 | + { |
| 4 | + "cell_type": "markdown", |
| 5 | + "metadata": {}, |
| 6 | + "source": [ |
| 7 | + "# Python Keywords" |
| 8 | + ] |
| 9 | + }, |
| 10 | + { |
| 11 | + "cell_type": "markdown", |
| 12 | + "metadata": {}, |
| 13 | + "source": [ |
| 14 | + "Keywords are the reserved words in python\n", |
| 15 | + "\n", |
| 16 | + "We can't use a keyword as variable name, function name or any other identifier\n", |
| 17 | + "\n", |
| 18 | + "Keywords are case sentive" |
| 19 | + ] |
| 20 | + }, |
| 21 | + { |
| 22 | + "cell_type": "code", |
| 23 | + "execution_count": 2, |
| 24 | + "metadata": {}, |
| 25 | + "outputs": [ |
| 26 | + { |
| 27 | + "name": "stdout", |
| 28 | + "output_type": "stream", |
| 29 | + "text": [ |
| 30 | + "['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'not', 'or', 'pass', 'print', 'raise', 'return', 'try', 'while', 'with', 'yield']\n", |
| 31 | + "('Total number of keywords ', 31)\n" |
| 32 | + ] |
| 33 | + } |
| 34 | + ], |
| 35 | + "source": [ |
| 36 | + "#Get all keywords in python 3.6\n", |
| 37 | + "\n", |
| 38 | + "import keyword\n", |
| 39 | + "\n", |
| 40 | + "print(keyword.kwlist)\n", |
| 41 | + "\n", |
| 42 | + "print(\"Total number of keywords \", len(keyword.kwlist))" |
| 43 | + ] |
| 44 | + }, |
| 45 | + { |
| 46 | + "cell_type": "markdown", |
| 47 | + "metadata": { |
| 48 | + "collapsed": true |
| 49 | + }, |
| 50 | + "source": [ |
| 51 | + "# Identifiers" |
| 52 | + ] |
| 53 | + }, |
| 54 | + { |
| 55 | + "cell_type": "markdown", |
| 56 | + "metadata": {}, |
| 57 | + "source": [ |
| 58 | + "Identifier is the name given to entities like class, functions, variables etc. in Python. It helps differentiating one entity from another." |
| 59 | + ] |
| 60 | + }, |
| 61 | + { |
| 62 | + "cell_type": "markdown", |
| 63 | + "metadata": {}, |
| 64 | + "source": [ |
| 65 | + "Rules for Writing Identifiers:\n", |
| 66 | + "\n", |
| 67 | + "1. Identifiers can be a combination of letters in lowercase (a to z) or uppercase (A to Z) or digits (0 to 9) or an underscore (_).\n", |
| 68 | + "\n", |
| 69 | + "2. An identifier cannot start with a digit. 1variable is invalid, but variable1 is perfectly fine.\n", |
| 70 | + "\n", |
| 71 | + "3. Keywords cannot be used as identifiers." |
| 72 | + ] |
| 73 | + }, |
| 74 | + { |
| 75 | + "cell_type": "code", |
| 76 | + "execution_count": 3, |
| 77 | + "metadata": {}, |
| 78 | + "outputs": [ |
| 79 | + { |
| 80 | + "ename": "SyntaxError", |
| 81 | + "evalue": "invalid syntax (<ipython-input-3-d0026cf49b71>, line 1)", |
| 82 | + "output_type": "error", |
| 83 | + "traceback": [ |
| 84 | + "\u001b[0;36m File \u001b[0;32m\"<ipython-input-3-d0026cf49b71>\"\u001b[0;36m, line \u001b[0;32m1\u001b[0m\n\u001b[0;31m global = 1\u001b[0m\n\u001b[0m ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m invalid syntax\n" |
| 85 | + ] |
| 86 | + } |
| 87 | + ], |
| 88 | + "source": [ |
| 89 | + "global = 1" |
| 90 | + ] |
| 91 | + }, |
| 92 | + { |
| 93 | + "cell_type": "markdown", |
| 94 | + "metadata": {}, |
| 95 | + "source": [ |
| 96 | + " We cannot use special symbols like !, @, #, ,ドル % etc. in our identifier." |
| 97 | + ] |
| 98 | + }, |
| 99 | + { |
| 100 | + "cell_type": "code", |
| 101 | + "execution_count": 5, |
| 102 | + "metadata": {}, |
| 103 | + "outputs": [ |
| 104 | + { |
| 105 | + "ename": "SyntaxError", |
| 106 | + "evalue": "invalid syntax (<ipython-input-5-b512271f00c8>, line 1)", |
| 107 | + "output_type": "error", |
| 108 | + "traceback": [ |
| 109 | + "\u001b[0;36m File \u001b[0;32m\"<ipython-input-5-b512271f00c8>\"\u001b[0;36m, line \u001b[0;32m1\u001b[0m\n\u001b[0;31m a@ = 10 #can't use special symbols as an identifier\u001b[0m\n\u001b[0m ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m invalid syntax\n" |
| 110 | + ] |
| 111 | + } |
| 112 | + ], |
| 113 | + "source": [ |
| 114 | + "a@ = 10 #can't use special symbols as an identifier" |
| 115 | + ] |
| 116 | + } |
| 117 | + ], |
| 118 | + "metadata": { |
| 119 | + "kernelspec": { |
| 120 | + "display_name": "Python 2", |
| 121 | + "language": "python", |
| 122 | + "name": "python2" |
| 123 | + }, |
| 124 | + "language_info": { |
| 125 | + "codemirror_mode": { |
| 126 | + "name": "ipython", |
| 127 | + "version": 2 |
| 128 | + }, |
| 129 | + "file_extension": ".py", |
| 130 | + "mimetype": "text/x-python", |
| 131 | + "name": "python", |
| 132 | + "nbconvert_exporter": "python", |
| 133 | + "pygments_lexer": "ipython2", |
| 134 | + "version": "2.7.13" |
| 135 | + } |
| 136 | + }, |
| 137 | + "nbformat": 4, |
| 138 | + "nbformat_minor": 2 |
| 139 | +} |
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