strings in Python

Author: ostad-ai

README.md

@@ -4,4 +4,5 @@
 2) Lists: Example, computing Khayyam-Pascal's triangle
 3) Lists: Copying
 4) Exercise: Solving quadratic equation
-5) Stacks are implemented by lists. An example to reverse a list with stack is also included.
+5) Stacks are implemented by lists. An example to reverse a list with stack is also included.
+6) strings in Python: Introduction

python-strings.ipynb

@@ -0,0 +1,224 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Python Everything:\n",
+    "6) *Strings* in Python: Introduction.\n",
+    "\n",
+    "# رشته ها در پایتون: آشنایی \n",
+    "By Hamed Shah-Hosseini<br>\n",
+    "The code is at: https://github.com/ostad-ai/Python-Everything"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Strings in Python are a sequence of characters\n",
+    "- enclosed by single or double quotation marks:\n",
+    "\n",
+    "رشته ها در پایتون، دنباله‌ای از نویسه ها هستند\n",
+    "- که با ماریک های بازگفت تک یا دوگانه، دربرگرفته شده"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Strings encloded with ' and \" are the same <br>\n",
+    "رشته ‌ها دربرگرفته شده با ' یا \" ، یکسان هستند"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "True"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "s='hello world'\n",
+    "s2=\"hello world\"\n",
+    "s==s2"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Accessing characters of a string:\n",
+    "<br> دسترسی به نویسه های یک رشته"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 32,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "h, e, l, l, o,  , w, o, r, l, d, \n",
+      "\n",
+      "h; e; l; l; o;  ; w; o; r; l; d; "
+     ]
+    }
+   ],
+   "source": [
+    "for char in s:\n",
+    "    print(char,end=', ')\n",
+    "    \n",
+    "print('\\n') # new line\n",
+    "\n",
+    "for i in range(len(s)):\n",
+    "    print(s[i],end='; ')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Replacing old substrings with new one:\n",
+    "<br> جایگزینی زیررشته های کهنه با نو"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "original: hello world\n",
+      "new one: helloworld\n"
+     ]
+    }
+   ],
+   "source": [
+    "s_no_space=s.replace(' ', '')\n",
+    "print('original:',s)\n",
+    "print('new one:', s_no_space)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Spliting a string based on a separator:\n",
+    "<br>شکاندن یک رشته برپایه یک جداگر"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['hello', 'world']\n"
+     ]
+    }
+   ],
+   "source": [
+    "separator=' '\n",
+    "print(s.split(separator))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Original: hello world\n",
+      "To upper: HELLO WORLD\n",
+      "To lower:  hello world\n",
+      "To title: Hello World\n",
+      "To capitalize: Hello world\n"
+     ]
+    }
+   ],
+   "source": [
+    "print('Original:',s)\n",
+    "print('To upper:', s.upper())\n",
+    "print('To lower: ',s.lower())\n",
+    "print('To title:',s.title())\n",
+    "print('To capitalize:',s.capitalize())"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Concatenating strings:\n",
+    "<br>بهم چسباندن رشته ها"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 33,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "To concatenate:  hello world, it's me, bye\n"
+     ]
+    }
+   ],
+   "source": [
+    "s3=', it\\'s me'\n",
+    "s4=', bye'\n",
+    "print('To concatenate: ',s+s3+s4)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "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": "3.8.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}