add telegram bot tutorial

Author: x4nth055

README.md

@@ -126,6 +126,7 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
     - [How to Translate Text in Python](https://www.thepythoncode.com/article/translate-text-in-python). ([code](general/using-google-translate-api))
     - [How to Make a URL Shortener in Python](https://www.thepythoncode.com/article/make-url-shortener-in-python). ([code](general/url-shortener))
     - [How to Get Google Page Ranking in Python](https://www.thepythoncode.com/article/get-google-page-ranking-by-keyword-in-python). ([code](general/getting-google-page-ranking))
+    - [How to Make a Telegram Bot in Python](https://www.thepythoncode.com/article/make-a-telegram-bot-in-python). ([code](general/telegram-bot))
 
 - ### [Database](https://www.thepythoncode.com/topic/using-databases-in-python)
     - [How to Use MySQL Database in Python](https://www.thepythoncode.com/article/using-mysql-database-in-python). ([code](database/mysql-connector))

general/telegram-bot/README.md

@@ -0,0 +1,5 @@
+# [How to Make a Telegram Bot in Python](https://www.thepythoncode.com/article/make-a-telegram-bot-in-python)
+To run this:
+- `pip3 install -r requirements.txt`
+- Get an API key contacting @FatherBot in Telegram
+- Run `telegram_bot.py`

general/telegram-bot/requirements.txt

@@ -0,0 +1 @@
+python-telegram-bot

general/telegram-bot/telegram_bot.py

@@ -0,0 +1,102 @@
+import telegram
+import telegram.ext
+import re
+from random import randint
+import logging
+logging.basicConfig(level=logging.INFO,
+                    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+
+# The API Key we received for our bot
+API_KEY = "1463892065:AAF-9uhbX2D9zrRQXMjgdisFBpY_l7lGCOs"
+# API_KEY = "<INSERT_API_KEY_HERE>"
+# Create an updater object with our API Key
+updater = telegram.ext.Updater(API_KEY)
+# Retrieve the dispatcher, which will be used to add handlers
+dispatcher = updater.dispatcher
+# Our states, as integers
+WELCOME = 0
+QUESTION = 1
+CANCEL = 2
+CORRECT = 3
+
+# The entry function
+def start(update_obj, context):
+    # send the question, and show the keyboard markup (suggested answers)
+    update_obj.message.reply_text("Hello there, do you want to answer a question? (Yes/No)",
+        reply_markup=telegram.ReplyKeyboardMarkup([['Yes', 'No']], one_time_keyboard=True)
+    )
+    # go to the WELCOME state
+    return WELCOME
+
+# helper function, generates new numbers and sends the question
+def randomize_numbers(update_obj, context):
+    # store the numbers in the context
+    context.user_data['rand_x'], context.user_data['rand_y'] = randint(0,1000), randint(0, 1000)
+    # send the question
+    update_obj.message.reply_text(f"Calculate {context.user_data['rand_x']}+{context.user_data['rand_y']}")
+
+# in the WELCOME state, check if the user wants to answer a question
+def welcome(update_obj, context):
+    if update_obj.message.text.lower() in ['yes', 'y']:
+        # send question, and go to the QUESTION state
+        randomize_numbers(update_obj, context)
+        return QUESTION
+    else:
+        # go to the CANCEL state
+        return CANCEL
+
+# in the QUESTION state
+def question(update_obj, context):
+    # expected solution
+    solution = int(context.user_data['rand_x']) + int(context.user_data['rand_y'])
+    # check if the solution was correct
+    if solution == int(update_obj.message.text):
+        # correct answer, ask the user if he found tutorial helpful, and go to the CORRECT state
+        update_obj.message.reply_text("Correct answer!")
+        update_obj.message.reply_text("Was this tutorial helpful to you?")
+        return CORRECT
+    else:
+        # wrong answer, reply, send a new question, and loop on the QUESTION state
+        update_obj.message.reply_text("Wrong answer :'(")
+        # send another random numbers calculation
+        randomize_numbers(update_obj, context)
+        return QUESTION
+
+# in the CORRECT state
+def correct(update_obj, context):
+    if update_obj.message.text.lower() in ['yes', 'y']:
+        update_obj.message.reply_text("Glad it was useful! ^^")
+    else:
+        update_obj.message.reply_text("You must be a programming wizard already!")
+    # get the user's first name
+    first_name = update_obj.message.from_user['first_name']
+    update_obj.message.reply_text(f"See you {first_name}!, bye")
+    return telegram.ext.ConversationHandler.END
+
+def cancel(update_obj, context):
+    # get the user's first name
+    first_name = update_obj.message.from_user['first_name']
+    update_obj.message.reply_text(
+        f"Okay, no question for you then, take care, {first_name}!", reply_markup=telegram.ReplyKeyboardRemove()
+    )
+    return telegram.ext.ConversationHandler.END
+
+# a regular expression that matches yes or no
+yes_no_regex = re.compile(r'^(yes|no|y|n)$', re.IGNORECASE)
+# Create our ConversationHandler, with only one state
+handler = telegram.ext.ConversationHandler(
+      entry_points=[telegram.ext.CommandHandler('start', start)],
+      states={
+            WELCOME: [telegram.ext.MessageHandler(telegram.ext.Filters.regex(yes_no_regex), welcome)],
+            QUESTION: [telegram.ext.MessageHandler(telegram.ext.Filters.regex(r'^\d+$'), question)],
+            CANCEL: [telegram.ext.MessageHandler(telegram.ext.Filters.regex(yes_no_regex), cancel)],
+            CORRECT: [telegram.ext.MessageHandler(telegram.ext.Filters.regex(yes_no_regex), correct)],
+      },
+      fallbacks=[telegram.ext.CommandHandler('cancel', cancel)],
+      )
+# add the handler to the dispatcher
+dispatcher.add_handler(handler)
+# start polling for updates from Telegram
+updater.start_polling()
+# block until a signal (like one sent by CTRL+C) is sent
+updater.idle()