lists-copying

Author: ostad-ai

README.md

@@ -1,4 +1,5 @@
 # Python-Everything
 
 1) Lists: Introduction
-2) Lists: Example, computing Khayyam-Pascal's triangle
+2) Lists: Example, computing Khayyam-Pascal's triangle
+3) Lists: Copying

lists-2-copying.ipynb

@@ -0,0 +1,141 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "f189c3fd",
+   "metadata": {},
+   "source": [
+    "# Python: Everything\n",
+    "- 2) Lists: Copying\n",
+    "<br>----------------------------------------------\n",
+    "<br> By Hamed Shah-Hosseini\n",
+    "<br> https://github.com/ostad-ai/Python-Everything\n",
+    "<br> https://www.pinterest.com/HamedShahHosseini/programming-languages/python\n",
+    "<br> Explanation in **Persian** language at Instagram: @words.persian"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "78beeaf8",
+   "metadata": {},
+   "source": [
+    "To copy a list with keyword $list$ or : , as shown below:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 17,
+   "id": "e2fa4e97",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "86545920 for [1, 2, 3, 'hello', 'world']\n",
+      "82048192 for [1, 2, 3, 'hello', 'world']\n",
+      "86545152 for [1, 2, 3, 'hello', 'world']\n"
+     ]
+    }
+   ],
+   "source": [
+    "mylist=[1,2,3,'hello','world']\n",
+    "mylist2=list(mylist)\n",
+    "mylist3=mylist[:]\n",
+    "print(f'{id(mylist)} for {mylist}')\n",
+    "print(f'{id(mylist2)} for {mylist2}')\n",
+    "print(f'{id(mylist3)} for {mylist3}')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "71985d4c",
+   "metadata": {},
+   "source": [
+    "To copy a list with $copy$:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "id": "0ddc46e1",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "86541312 for [1, 2, 3, 'hello', 'world']\n",
+      "82025600 for [1, 2, 3, 'hello', 'world']\n"
+     ]
+    }
+   ],
+   "source": [
+    "mylist=[1,2,3,'hello','world']\n",
+    "mylist2=mylist.copy()\n",
+    "print(f'{id(mylist)} for {mylist}')\n",
+    "print(f'{id(mylist2)} for {mylist2}')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "574d3a0b",
+   "metadata": {},
+   "source": [
+    "To copy a nested list, we should use $deepcopy$:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 19,
+   "id": "b02995f7",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "82028352 for [[1, 2, 3], ['hello', 'world']]\n",
+      "86534144 for [[1, 2, 3], ['hello', 'world']]\n"
+     ]
+    }
+   ],
+   "source": [
+    "from copy import deepcopy\n",
+    "mylist=[[1,2,3],['hello','world']]\n",
+    "mylist2=deepcopy(mylist)\n",
+    "print(f'{id(mylist)} for {mylist}')\n",
+    "print(f'{id(mylist2)} for {mylist2}')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "9dd1d861",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}