bot.py

@bot.message_handler(commands=['start']) # welcome message handler
def send_welcome(message):
    bot.reply_to(message, 'Hello! I am bot')

@bot.message_handler(commands=['help']) # help message handler
def send_welcome(message):
    bot.reply_to(message, 'Help message')

@bot.message_handler(func=lambda message: True) # makes the bot imitate the user's message
def echo_all(message):
	bot.reply_to(message, message.text)