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Created January 12, 2022 17:30
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Lesson02.ipynb
{
"cells": [
{
"metadata": {},
"cell_type": "markdown",
"source": "## Наука о данных\n### Совместный бакалавриат ВШЭ-РЭШ, 2021-2022 учебный год\n_Илья Щуров_\n\n[Страница курса](http://math-info.hse.ru/s21/j)"
},
{
"metadata": {},
"cell_type": "markdown",
"source": "### Занятие 2. Списки"
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "print(\"Hello, World!\")\n# http://python.math-hse.info/",
"execution_count": null,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list = [10, 20, 30, 40, 100]",
"execution_count": 1,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[2]",
"execution_count": 3,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 3,
"data": {
"text/plain": "30"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[2] = 150",
"execution_count": 4,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 5,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 5,
"data": {
"text/plain": "[10, 20, 150, 40, 100]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[5] = 1500",
"execution_count": 6,
"outputs": [
{
"output_type": "error",
"ename": "IndexError",
"evalue": "list assignment index out of range",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mIndexError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-6-86c20b2b4c4c>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mmy_list\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m5\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m1500\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mIndexError\u001b[0m: list assignment index out of range"
]
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 7,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 7,
"data": {
"text/plain": "[10, 20, 150, 40, 100]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list.append(1500)",
"execution_count": 8,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 9,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 9,
"data": {
"text/plain": "[10, 20, 150, 40, 100, 1500]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list.insert(1, 99)",
"execution_count": 10,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 11,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 11,
"data": {
"text/plain": "[10, 99, 20, 150, 40, 100, 1500]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "del my_list[1]",
"execution_count": 12,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 13,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 13,
"data": {
"text/plain": "[10, 20, 150, 40, 100, 1500]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "type(my_list)",
"execution_count": 14,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 14,
"data": {
"text/plain": "list"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "type(my_list[1])",
"execution_count": 15,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 15,
"data": {
"text/plain": "int"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "strange_list = [1, 2, \"Hello\", 2.5]",
"execution_count": 16,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "strange_list",
"execution_count": 17,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 17,
"data": {
"text/plain": "[1, 2, 'Hello', 2.5]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "print(my_list)",
"execution_count": 18,
"outputs": [
{
"output_type": "stream",
"text": "[10, 20, 150, 40, 100, 1500]\n",
"name": "stdout"
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "str(my_list)",
"execution_count": 19,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 19,
"data": {
"text/plain": "'[10, 20, 150, 40, 100, 1500]'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 20,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 20,
"data": {
"text/plain": "[10, 20, 150, 40, 100, 1500]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[3:5] # slice (срез) [x, y)",
"execution_count": 23,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 23,
"data": {
"text/plain": "[40, 100]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[3:]",
"execution_count": 24,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 24,
"data": {
"text/plain": "[40, 100, 1500]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 25,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 25,
"data": {
"text/plain": "[10, 20, 150, 40, 100, 1500]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list.extend([1, 2, 3])",
"execution_count": 26,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 27,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 27,
"data": {
"text/plain": "[10, 20, 150, 40, 100, 1500, 1, 2, 3]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[2:2] = [0, 0, 0]",
"execution_count": 29,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 30,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 30,
"data": {
"text/plain": "[10, 20, 0, 0, 0, 150, 40, 100, 1500, 1, 2, 3]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[2] = [1, 2, 3]",
"execution_count": 31,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 32,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 32,
"data": {
"text/plain": "[10, 20, [1, 2, 3], 0, 0, 150, 40, 100, 1500, 1, 2, 3]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[2][0]",
"execution_count": 35,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 35,
"data": {
"text/plain": "1"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[2:4]",
"execution_count": 36,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 36,
"data": {
"text/plain": "[[1, 2, 3], 0]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list = [0, 10, 20, 30, 40, 50]",
"execution_count": 37,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list",
"execution_count": 38,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 38,
"data": {
"text/plain": "[0, 10, 20, 30, 40, 50]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[2:6]",
"execution_count": 39,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 39,
"data": {
"text/plain": "[20, 30, 40, 50]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[2:6:2]",
"execution_count": 40,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 40,
"data": {
"text/plain": "[20, 40]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_list[6:2:-1]",
"execution_count": 41,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 41,
"data": {
"text/plain": "[50, 40, 30]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "first = [2, 3, 4]\nsecond = [10, 20, 30]",
"execution_count": 42,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "first + second",
"execution_count": 43,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 43,
"data": {
"text/plain": "[2, 3, 4, 10, 20, 30]"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s = \"Hello, World!\"",
"execution_count": 44,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s[3]",
"execution_count": 46,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 46,
"data": {
"text/plain": "'l'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s[3:6:2]",
"execution_count": 69,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 69,
"data": {
"text/plain": "'l,'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s",
"execution_count": 65,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 65,
"data": {
"text/plain": "'Hello, World!'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s[6:2:-1]",
"execution_count": 48,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 48,
"data": {
"text/plain": "' ,ol'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s",
"execution_count": 71,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 71,
"data": {
"text/plain": "'Hello, World!'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s[2:6:-1]",
"execution_count": 70,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 70,
"data": {
"text/plain": "''"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s[:3]",
"execution_count": 66,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 66,
"data": {
"text/plain": "'Hel'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s[3:]",
"execution_count": 67,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 67,
"data": {
"text/plain": "'lo, World!'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "s[::-1]",
"execution_count": 68,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 68,
"data": {
"text/plain": "'!dlroW ,olleH'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "sentence = \"Hello, World! This is a test!\"",
"execution_count": 52,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "sentence.split(\"!\")",
"execution_count": 53,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 53,
"data": {
"text/plain": "['Hello, World', ' This is a test', '']"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "sentence",
"execution_count": 54,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 54,
"data": {
"text/plain": "'Hello, World! This is a test!'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "parts = sentence.split(\"!\")\nparts[0]",
"execution_count": 56,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 56,
"data": {
"text/plain": "'Hello, World'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "sentence",
"execution_count": 57,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 57,
"data": {
"text/plain": "'Hello, World! This is a test!'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "sentence[0]",
"execution_count": 59,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 59,
"data": {
"text/plain": "'H'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "sentence[0] = \"A\"",
"execution_count": 58,
"outputs": [
{
"output_type": "error",
"ename": "TypeError",
"evalue": "'str' object does not support item assignment",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-58-f5e190b4cd8a>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0msentence\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m0\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m\"A\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m: 'str' object does not support item assignment"
]
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "list(\"Hello, World!\")",
"execution_count": 60,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 60,
"data": {
"text/plain": "['H', 'e', 'l', 'l', 'o', ',', ' ', 'W', 'o', 'r', 'l', 'd', '!']"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "type(s[4])",
"execution_count": 63,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 63,
"data": {
"text/plain": "str"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "type(s)",
"execution_count": 64,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 64,
"data": {
"text/plain": "str"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "sentence",
"execution_count": 72,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 72,
"data": {
"text/plain": "'Hello, World! This is a test!'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "sentence.split()",
"execution_count": 73,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 73,
"data": {
"text/plain": "['Hello,', 'World!', 'This', 'is', 'a', 'test!']"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "story = \"First sentence.\\nSecond sentence.\\n\\nThe end.\"",
"execution_count": 74,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "story",
"execution_count": 78,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 78,
"data": {
"text/plain": "'First sentence.\\nSecond sentence.\\n\\nThe end.'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "print(story)",
"execution_count": 76,
"outputs": [
{
"output_type": "stream",
"text": "First sentence.\nSecond sentence.\n\nThe end.\n",
"name": "stdout"
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "story.split()",
"execution_count": 79,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 79,
"data": {
"text/plain": "['First', 'sentence.', 'Second', 'sentence.', 'The', 'end.']"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "words = \"One two three\"",
"execution_count": 82,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "list_of_words = words.split()",
"execution_count": 83,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "list_of_words",
"execution_count": 84,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 84,
"data": {
"text/plain": "['One', 'two', 'three']"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "\" \".join(list_of_words)",
"execution_count": 85,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 85,
"data": {
"text/plain": "'One two three'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "\"!\".join(list_of_words)",
"execution_count": 86,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 86,
"data": {
"text/plain": "'One!two!three'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "\"***\".join(list_of_words)",
"execution_count": 87,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 87,
"data": {
"text/plain": "'One***two***three'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "my_words = [\"Hello\", \"World\"]",
"execution_count": 88,
"outputs": []
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "\"\".join(my_words)",
"execution_count": 90,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 90,
"data": {
"text/plain": "'HelloWorld'"
},
"metadata": {}
}
]
},
{
"metadata": {
"trusted": true
},
"cell_type": "code",
"source": "glue = \"!!!\"\nglue.join([\"Hello\", \"World\"])",
"execution_count": 91,
"outputs": [
{
"output_type": "execute_result",
"execution_count": 91,
"data": {
"text/plain": "'Hello!!!World'"
},
"metadata": {}
}
]
}
],
"metadata": {
"kernelspec": {
"name": "py39_system",
"display_name": "Python 3.9 (system)",
"language": "python"
},
"language_info": {
"name": "python",
"version": "3.9.0",
"mimetype": "text/x-python",
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"pygments_lexer": "ipython3",
"nbconvert_exporter": "python",
"file_extension": ".py"
},
"gist": {
"id": "",
"data": {
"description": "Lesson02.ipynb",
"public": false
}
}
},
"nbformat": 4,
"nbformat_minor": 5
}
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