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pistatium/immutable_python.ipynb

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Immutable Python スクリプト
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immutable_python.ipynb
{
"nbformat": 4,
"nbformat_minor": 0,
"metadata": {
"colab": {
"name": "Untitled2.ipynb",
"provenance": []
},
"kernelspec": {
"name": "python3",
"display_name": "Python 3"
}
},
"cells": [
{
"cell_type": "markdown",
"metadata": {
"id": "c6hlTFHILlZc",
"colab_type": "text"
},
"source": [
"## list と tuple の違い\n",
"### list の 場合"
]
},
{
"cell_type": "code",
"metadata": {
"id": "ZxcUqO1bLTNm",
"colab_type": "code",
"colab": {}
},
"source": [
"l = [1, 2, 3, 4, 5] "
],
"execution_count": 0,
"outputs": []
},
{
"cell_type": "code",
"metadata": {
"id": "It2GVhDrLaLm",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "581d924b-8c07-42ea-999f-3dc67942cb44"
},
"source": [
"# index を指定して読み取り\n",
"l[1] "
],
"execution_count": 4,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"2"
]
},
"metadata": {
"tags": []
},
"execution_count": 4
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "uqc5QpCQLb9A",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "48a23235-876f-45fd-f1b2-33b29ea0cb81"
},
"source": [
"# 範囲を指定して取り出し\n",
"l[:3] "
],
"execution_count": 5,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"[1, 2, 3]"
]
},
"metadata": {
"tags": []
},
"execution_count": 5
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "HAv9mZ7oMu7Y",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "49a8946e-b1a4-4da5-d7d6-759915327ed8"
},
"source": [
"# index を指定して書き換え\n",
"l[0] = 6\n",
"l"
],
"execution_count": 13,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"[6, 2, 3, 4, 5]"
]
},
"metadata": {
"tags": []
},
"execution_count": 13
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "YqzgszZFM4RT",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "a6e45570-e83c-4fcb-e9d1-70642412d6a0"
},
"source": [
"# 末尾に追加\n",
"l.append(7)\n",
"l"
],
"execution_count": 15,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"[6, 2, 3, 4, 5, 7, 7]"
]
},
"metadata": {
"tags": []
},
"execution_count": 15
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "arspcb-uM9pk",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "ed390141-75a8-4aed-e2e6-dff18b7055ce"
},
"source": [
"# 変数の使い回し\n",
"l = [8, 9, 10]\n",
"l"
],
"execution_count": 17,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"[8, 9, 10]"
]
},
"metadata": {
"tags": []
},
"execution_count": 17
}
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "IOnDxHqoLuoP",
"colab_type": "text"
},
"source": [
"### tuple の場合"
]
},
{
"cell_type": "code",
"metadata": {
"id": "alcq-BFkLyKT",
"colab_type": "code",
"colab": {}
},
"source": [
"t = (1, 2, 3, 4, 5)"
],
"execution_count": 0,
"outputs": []
},
{
"cell_type": "code",
"metadata": {
"id": "zmsEThIPL1ne",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "bfa47803-4668-41fd-e6ee-5883934123ed"
},
"source": [
"# index を指定して読み取り\n",
"t[1]"
],
"execution_count": 7,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"2"
]
},
"metadata": {
"tags": []
},
"execution_count": 7
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "b0I0_uZUL40V",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "262986ab-d55f-49f0-8a45-764312505410"
},
"source": [
"# 範囲を指定して取り出し\n",
"t[:3]"
],
"execution_count": 9,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"(1, 2, 3)"
]
},
"metadata": {
"tags": []
},
"execution_count": 9
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "F1ZVwHYnL6qv",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 164
},
"outputId": "b2e252bb-a4be-4516-80e5-2cba460a59b9"
},
"source": [
"# index を指定して書き換え\n",
"t[0] = 6"
],
"execution_count": 18,
"outputs": [
{
"output_type": "error",
"ename": "TypeError",
"evalue": "ignored",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-18-28b8e5df48e8>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mt\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m0\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m6\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m: 'tuple' object does not support item assignment"
]
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "YUoxJ-VxNHYA",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 164
},
"outputId": "d8f8de5d-4d7a-4fa1-f03f-2ed21b0c489f"
},
"source": [
"# 末尾に追加\n",
"t.append(7)"
],
"execution_count": 19,
"outputs": [
{
"output_type": "error",
"ename": "AttributeError",
"evalue": "ignored",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mAttributeError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-19-91f1b43b8697>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mt\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mappend\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m7\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mAttributeError\u001b[0m: 'tuple' object has no attribute 'append'"
]
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "8P1bvXWqNKgM",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "1262edda-63d9-427c-a25d-19e47d9dcba6"
},
"source": [
"# 変数の使い回し\n",
"t = [8, 9, 10]\n",
"t"
],
"execution_count": 20,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"[8, 9, 10]"
]
},
"metadata": {
"tags": []
},
"execution_count": 20
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "pJIrTIsTNPpP",
"colab_type": "code",
"colab": {}
},
"source": [
""
],
"execution_count": 0,
"outputs": []
},
{
"cell_type": "markdown",
"metadata": {
"id": "OjoHqr3nNSkF",
"colab_type": "text"
},
"source": [
"## 比較"
]
},
{
"cell_type": "code",
"metadata": {
"id": "zp5cU7MFNWql",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "b487c05a-616f-494d-a3fa-306fc59815b8"
},
"source": [
"class Hoge:\n",
" def __init__(self):\n",
" self.fuga = 'fuga'\n",
"\n",
"h1 = Hoge()\n",
"h2 = Hoge()\n",
"h1 == h2"
],
"execution_count": 21,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"False"
]
},
"metadata": {
"tags": []
},
"execution_count": 21
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "M3DsctloNjCi",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "5ca161f7-c79a-461d-b5c3-55a889bbb340"
},
"source": [
"from typing import NamedTuple\n",
"\n",
"class Hoge(NamedTuple):\n",
" fuga: str = 'fuga'\n",
"\n",
"h1 = Hoge()\n",
"h2 = Hoge()\n",
"h1 == h2"
],
"execution_count": 22,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"True"
]
},
"metadata": {
"tags": []
},
"execution_count": 22
}
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "i4d0E1q2NxTT",
"colab_type": "text"
},
"source": [
"## 副作用"
]
},
{
"cell_type": "code",
"metadata": {
"id": "yewDtu_uN0Ns",
"colab_type": "code",
"colab": {}
},
"source": [
"def print_last(l: list):\n",
" \"\"\" Listの一番後ろを表示する関数 \"\"\"\n",
" last = l.pop()\n",
" print(last)\n",
"\n",
"l = [1, 2, 3]"
],
"execution_count": 0,
"outputs": []
},
{
"cell_type": "code",
"metadata": {
"id": "ohoL77kRN2rI",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "03a32a03-2aaf-4aa2-fa49-74f00fb26710"
},
"source": [
"print_last(l)"
],
"execution_count": 24,
"outputs": [
{
"output_type": "stream",
"text": [
"3\n"
],
"name": "stdout"
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "1qNbLurTN4aq",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "b9bf7c24-0391-4717-b433-239a69173a6d"
},
"source": [
"l"
],
"execution_count": 25,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"[1, 2]"
]
},
"metadata": {
"tags": []
},
"execution_count": 25
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "btFMW4mgN5Hk",
"colab_type": "code",
"colab": {}
},
"source": [
"def print_last(t : tuple):\n",
" \"\"\" tuple バージョン \"\"\"\n",
" t = t[-1] \n",
" print(t)\n",
"\n",
"t = (1, 2, 3)"
],
"execution_count": 0,
"outputs": []
},
{
"cell_type": "code",
"metadata": {
"id": "j8KwfWsQODR7",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "d81378f7-a1d6-4d62-dcb4-6da8a69b9460"
},
"source": [
"print_last(t)"
],
"execution_count": 29,
"outputs": [
{
"output_type": "stream",
"text": [
"3\n"
],
"name": "stdout"
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "vp1hKx3dOMWA",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "c5d671bd-2fc4-49c1-efc0-fd277eb1d923"
},
"source": [
"t"
],
"execution_count": 30,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"(1, 2, 3)"
]
},
"metadata": {
"tags": []
},
"execution_count": 30
}
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "80iu048KOPTs",
"colab_type": "text"
},
"source": [
"## ハッシュ化"
]
},
{
"cell_type": "code",
"metadata": {
"id": "h6wSG0hQOR4H",
"colab_type": "code",
"colab": {}
},
"source": [
"l = [1, 2, 3] # list\n",
"t = (1, 2, 3) # tuple\n",
"\n",
"d = {}"
],
"execution_count": 0,
"outputs": []
},
{
"cell_type": "code",
"metadata": {
"id": "X467p-NOOjnN",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 164
},
"outputId": "16878d3f-8801-4a7f-a23a-747b72701826"
},
"source": [
"d[l] = \"これは list です\""
],
"execution_count": 32,
"outputs": [
{
"output_type": "error",
"ename": "TypeError",
"evalue": "ignored",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mTypeError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-32-348e43151d5a>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0md\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0ml\u001b[0m\u001b[0;34m]\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m\"これは list です\"\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'"
]
}
]
},
{
"cell_type": "code",
"metadata": {
"id": "YKIHLaWwOk5Z",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "6d858549-39d3-45d9-c3cb-a337656d75d9"
},
"source": [
"d[t] = \"これは tuple です\"\n",
"d"
],
"execution_count": 34,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"{(1, 2, 3): 'これは tuple です'}"
]
},
"metadata": {
"tags": []
},
"execution_count": 34
}
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "US-PpS0fO7nH",
"colab_type": "text"
},
"source": [
"## 構造化したNamedTuple"
]
},
{
"cell_type": "code",
"metadata": {
"id": "c7RWwowJPASb",
"colab_type": "code",
"colab": {}
},
"source": [
"from typing import Tuple, NamedTuple\n",
"\n",
"class User(NamedTuple):\n",
" name: str\n",
"\n",
"class Group(NamedTuple):\n",
" users: Tuple[User, ...]\n",
"\n",
"u1 = User(name='taro')\n",
"u2 = User(name='hanako')\n",
"g = Group(users=(u1, u2))"
],
"execution_count": 0,
"outputs": []
},
{
"cell_type": "code",
"metadata": {
"id": "9MWCJmuxPDmn",
"colab_type": "code",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 34
},
"outputId": "239293bd-1064-4c11-dc3e-9b9b4440a823"
},
"source": [
"g"
],
"execution_count": 38,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"Group(users=(User(name='taro'), User(name='hanako')))"
]
},
"metadata": {
"tags": []
},
"execution_count": 38
}
]
}
]
}
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