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lesson07.ipynb
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| { | |
| "cells": [ | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "## лямбда-функции", | |
| "execution_count": null, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "table = [[1, 4, 3],\n [2, 3, 4],\n [0, 2, 5]]\n\ndef get_second_element(row):\n return row[1]\n\nsorted(table, key=get_second_element)", | |
| "execution_count": 1, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "[[0, 2, 5], [2, 3, 4], [1, 4, 3]]" | |
| }, | |
| "execution_count": 1, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "def subs2(f):\n return f(2)", | |
| "execution_count": 2, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "subs2(lambda x: x * 3)", | |
| "execution_count": 4, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "6" | |
| }, | |
| "execution_count": 4, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "(lambda x: x * 3)(5)", | |
| "execution_count": 5, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "15" | |
| }, | |
| "execution_count": 5, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "def mult_3(x):\n return x * 3\nmult_3(5)", | |
| "execution_count": 6, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "15" | |
| }, | |
| "execution_count": 6, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "sorted(table, key=lambda row: row[1])", | |
| "execution_count": 9, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "[[0, 2, 5], [2, 3, 4], [1, 4, 3]]" | |
| }, | |
| "execution_count": 9, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "(lambda x: x if x > 0 else -x)(-5)", | |
| "execution_count": 12, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "5" | |
| }, | |
| "execution_count": 12, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "(lambda x: [i ** 2 for i in range(x) if i % 3 == 0])(20)", | |
| "execution_count": 14, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "[0, 9, 36, 81, 144, 225, 324]" | |
| }, | |
| "execution_count": 14, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "(lambda x, f: f(x))(10, lambda x: x ** 2)", | |
| "execution_count": 15, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "100" | |
| }, | |
| "execution_count": 15, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "from operator import itemgetter", | |
| "execution_count": 16, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "sorted(table, key=itemgetter(1))", | |
| "execution_count": 18, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "[[0, 2, 5], [2, 3, 4], [1, 4, 3]]" | |
| }, | |
| "execution_count": 18, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "itemgetter(1)([100, 200, 300, 400])", | |
| "execution_count": 20, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "200" | |
| }, | |
| "execution_count": 20, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "itemgetter(2)([100, 200, 300, 400])", | |
| "execution_count": 21, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "300" | |
| }, | |
| "execution_count": 21, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "itemgetter(1, 3)([100, 200, 300, 400])", | |
| "execution_count": 24, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "(200, 400)" | |
| }, | |
| "execution_count": 24, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "incrementors = []\nfor i in range(10):\n incrementors.append(lambda x: x + i)", | |
| "execution_count": 25, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "incrementors[0](20)", | |
| "execution_count": 28, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "29" | |
| }, | |
| "execution_count": 28, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "incrementors[3](20)", | |
| "execution_count": 27, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "29" | |
| }, | |
| "execution_count": 27, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "i = 50", | |
| "execution_count": 29, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "incrementors[3](20)", | |
| "execution_count": 30, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "70" | |
| }, | |
| "execution_count": 30, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "incrementors = []\nfor i in range(10):\n incrementors.append(lambda x, inc=i: x + inc)", | |
| "execution_count": 31, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "incrementors[3](7)", | |
| "execution_count": 32, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "10" | |
| }, | |
| "execution_count": 32, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "incrementors[5](2)", | |
| "execution_count": 34, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "7" | |
| }, | |
| "execution_count": 34, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "incrementors[5](2, inc=200)", | |
| "execution_count": 37, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "202" | |
| }, | |
| "execution_count": 37, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "## упражнение\n## напишите itemgetter", | |
| "execution_count": 38, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": {}, | |
| "cell_type": "markdown", | |
| "source": "## Множества" | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "A = {1, 2, 3}\nB = {3, 2, 2, 2, 'a'}", | |
| "execution_count": 115, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "A", | |
| "execution_count": 116, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "{1, 2, 3}" | |
| }, | |
| "execution_count": 116, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "B", | |
| "execution_count": 117, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "{2, 3, 'a'}" | |
| }, | |
| "execution_count": 117, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "A | B", | |
| "execution_count": 118, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "{1, 2, 3, 'a'}" | |
| }, | |
| "execution_count": 118, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "A & B", | |
| "execution_count": 119, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "{2, 3}" | |
| }, | |
| "execution_count": 119, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "1 in A", | |
| "execution_count": 120, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "True" | |
| }, | |
| "execution_count": 120, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "for i in sorted(A):\n print(i)", | |
| "execution_count": 124, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "1\n2\n3\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": {}, | |
| "cell_type": "markdown", | |
| "source": "## Пример" | |
| }, | |
| { | |
| "metadata": {}, | |
| "cell_type": "markdown", | |
| "source": "Пусть мы хотим убедиться, что среди чисел `x`, `y` и `z` нет одинаковых." | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "x = 1\ny = 2\nz = 4\nif x != y and x != z and y != z:\n print(\"All different\")", | |
| "execution_count": 46, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "All different\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "if len({x, y, z}) == 3:\n print(\"All different\")", | |
| "execution_count": 47, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "All different\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "set({1, 2, 3})[1]", | |
| "execution_count": 48, | |
| "outputs": [ | |
| { | |
| "ename": "TypeError", | |
| "evalue": "'set' object does not support indexing", | |
| "output_type": "error", | |
| "traceback": [ | |
| "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m", | |
| "\u001b[0;31mTypeError\u001b[0m Traceback (most recent call last)", | |
| "\u001b[0;32m<ipython-input-48-86da26f02818>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mset\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m{\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;36m2\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;36m3\u001b[0m\u001b[0;34m}\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m1\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: 'set' object does not support indexing" | |
| ] | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "list(set({1, 2, 3}))[0]", | |
| "execution_count": 49, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "1" | |
| }, | |
| "execution_count": 49, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "{'a', [2]}", | |
| "execution_count": 50, | |
| "outputs": [ | |
| { | |
| "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-50-7882af34050d>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;34m{\u001b[0m\u001b[0;34m'a'\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m[\u001b[0m\u001b[0;36m2\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;31mTypeError\u001b[0m: unhashable type: 'list'" | |
| ] | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "{(1, 2), (3, 4)}", | |
| "execution_count": 51, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "{(1, 2), (3, 4)}" | |
| }, | |
| "execution_count": 51, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": {}, | |
| "cell_type": "markdown", | |
| "source": "## Немного про строки" | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "s = \"Hello, world!\"", | |
| "execution_count": 52, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "s.replace(\",\", \"!\")", | |
| "execution_count": 53, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'Hello! world!'" | |
| }, | |
| "execution_count": 53, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "s.replace(\"lo\", \"LOL\")", | |
| "execution_count": 54, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'HelLOL, world!'" | |
| }, | |
| "execution_count": 54, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "s.replace(\"l\", \"L\", 1)", | |
| "execution_count": 56, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'HeLlo, world!'" | |
| }, | |
| "execution_count": 56, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "s.startswith(\"He\")", | |
| "execution_count": 57, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "True" | |
| }, | |
| "execution_count": 57, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "s.endswith(\"!\")", | |
| "execution_count": 58, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "True" | |
| }, | |
| "execution_count": 58, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "\"abba\".translate({'a': 'X', 'b': 'Y'})", | |
| "execution_count": 59, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'abba'" | |
| }, | |
| "execution_count": 59, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "s[2:9]", | |
| "execution_count": 63, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'llo, wo'" | |
| }, | |
| "execution_count": 63, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "import os", | |
| "execution_count": 65, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "os.getcwd()", | |
| "execution_count": 66, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'/Users/user/prj/svn.math-hse.info/repo/2020-21/nes-datascience'" | |
| }, | |
| "execution_count": 66, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "f = open(\"untitled.txt\")\nfor line in f:\n print(line.rstrip())\nf.close()", | |
| "execution_count": 71, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Раз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "line", | |
| "execution_count": 68, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'Hello, world!\\n'" | |
| }, | |
| "execution_count": 68, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "print(\"Hello\", end=\" \")\nprint(\"World\")", | |
| "execution_count": 69, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Hello World\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "print(\"Hello\")\nprint(\"World\")", | |
| "execution_count": 70, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Hello\nWorld\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "f = open(\"untitled.txt\")\nfor line in f:\n print(line.rstrip())\nprint(\"== Once again ==\")\nfor line in f:\n print(line.rstrip())\nf.close()", | |
| "execution_count": 73, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Раз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n== Once again ==\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "f = open(\"untitled.txt\")\nfor line in f:\n print(line.rstrip())\nprint(\"== Once again ==\")\nf.seek(0)\nfor line in f:\n print(line.rstrip())\nf.close()", | |
| "execution_count": 74, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Раз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n== Once again ==\nРаз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "f = open(\"untitled.txt\")\nfor line in f:\n print(line.rstrip())\nprint(\"== Once again ==\")\nf.close()\nf = open(\"untitled.txt\")\nfor line in f:\n print(line.rstrip())\nf.close()", | |
| "execution_count": 75, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Раз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n== Once again ==\nРаз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "f = open(\"untitled.txt\")\nfor line in f:\n print(line.rstrip())\nprint(\"== Once again ==\")\nf.seek(2)\nfor line in f:\n print(line.rstrip())\nf.close()", | |
| "execution_count": 77, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Раз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n== Once again ==\nаз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "f = open(\"untitled.txt\", encoding='CP1251')\nfor line in f:\n print(line.rstrip())\nprint(\"== Once again ==\")\nf.seek(2)\nfor line in f:\n print(line.rstrip())\nf.close()", | |
| "execution_count": 78, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Раз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n== Once again ==\nаз два три четыре пять.\nВышел зайчик погулять.\nОй-ой-ой.\nHello, world!\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "f = open(\"untitled.txt\")\nfor line in f:\n lines = f.readlines()\nf.close()", | |
| "execution_count": 79, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "lines", | |
| "execution_count": 80, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "['Вышел зайчик погулять.\\n', 'Ой-ой-ой.\\n', 'Hello, world!\\n']" | |
| }, | |
| "execution_count": 80, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "f = open(\"untitled.txt\")\nfor line in f:\n lines = f.read()\nf.close()", | |
| "execution_count": 81, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "lines", | |
| "execution_count": 82, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'Вышел зайчик погулять.\\nОй-ой-ой.\\nHello, world!\\n'" | |
| }, | |
| "execution_count": 82, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "with open(\"untitled.txt\") as f:\n lines = f.readlines()\n print(\"We read the file\")\n print(f.closed)\n print(\"It's still open\")\nprint(\"Now it's closed\")\nprint(f.closed)", | |
| "execution_count": 83, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "We read the file\nFalse\nIt's still open\nNow it's closed\nTrue\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "f.readlines()", | |
| "execution_count": 84, | |
| "outputs": [ | |
| { | |
| "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-84-055d0c37aeda>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mf\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[0m", | |
| "\u001b[0;31mValueError\u001b[0m: I/O operation on closed file." | |
| ] | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "with open(\"newfile.txt\", \"w\") as f:\n print(\"Этот файл написал искусственный интеллект\", file=f)\n print(\"Humans, beware!\", file=f)", | |
| "execution_count": 85, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "with open(\"newfile.txt\", \"a\") as f:\n print(\"Skynet is coming!\", file=f)", | |
| "execution_count": 86, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "from pathlib import Path", | |
| "execution_count": 87, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "for i in range(1, 12):\n print(f\"dir{i:03}\")", | |
| "execution_count": 92, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "dir001\ndir002\ndir003\ndir004\ndir005\ndir006\ndir007\ndir008\ndir009\ndir010\ndir011\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "for i in range(1, 11):\n Path(f\"dir{i:02}\").mkdir(exist_ok=True)", | |
| "execution_count": 95, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "for i in range(1, 11):\n with open(Path(f\"dir{i:02}\") / \"myfile.txt\", \"w\") as f:\n print(f\"This is file in folder {i}\", file=f)", | |
| "execution_count": 100, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "Path(f\"dir{i:02}\") / \"myfile.txt\"", | |
| "execution_count": 98, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "PosixPath('dir10/myfile.txt')" | |
| }, | |
| "execution_count": 98, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "Path(\"a\") / \"b\" / \"c\"", | |
| "execution_count": 99, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "PosixPath('a/b/c')" | |
| }, | |
| "execution_count": 99, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "p = Path(\"dir\") / \"subdir\" / \"file.txt\"", | |
| "execution_count": 101, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "p.exists()", | |
| "execution_count": 103, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "False" | |
| }, | |
| "execution_count": 103, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "Path(\"..\") / \"..\"", | |
| "execution_count": 105, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "PosixPath('../..')" | |
| }, | |
| "execution_count": 105, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "os.getcwd()", | |
| "execution_count": 106, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'/Users/user/prj/svn.math-hse.info/repo/2020-21/nes-datascience'" | |
| }, | |
| "execution_count": 106, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "(Path(\"dir02\") / \"myfile.txt\").read_text()", | |
| "execution_count": 109, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'This is file in folder 2\\n'" | |
| }, | |
| "execution_count": 109, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "for file in Path(\".\").iterdir():\n if file.is_dir():\n print(file)", | |
| "execution_count": 113, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "assignments\ndir01\ndir06\ndir08\ndir09\ndir07\nold\ndir10\n.ipynb_checkpoints\ndir05\ndir02\ndir03\ndir04\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "cell_type": "code", | |
| "source": "", | |
| "execution_count": null, | |
| "outputs": [] | |
| } | |
| ], | |
| "metadata": { | |
| "kernelspec": { | |
| "name": "python3", | |
| "display_name": "Python 3", | |
| "language": "python" | |
| }, | |
| "language_info": { | |
| "name": "python", | |
| "version": "3.6.10", | |
| "mimetype": "text/x-python", | |
| "codemirror_mode": { | |
| "name": "ipython", | |
| "version": 3 | |
| }, | |
| "pygments_lexer": "ipython3", | |
| "nbconvert_exporter": "python", | |
| "file_extension": ".py" | |
| }, | |
| "gist": { | |
| "id": "", | |
| "data": { | |
| "description": "lesson07.ipynb", | |
| "public": false | |
| } | |
| } | |
| }, | |
| "nbformat": 4, | |
| "nbformat_minor": 4 | |
| } |
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