What's the differences between running the program on cmd and telegram app?

[tjdwns32]

Hi
I got a problem recently, well I really don't know why this happen.
I added a statement 'from pymongo import MongoClient' on bot.py file in bothub folder
then never used(i just imported it and never used)
and I don't modify any other code(this program just respond echo for the input)
This program goes well in my cmd window, but not in telegram app.
Can you guys tell me why? please

Have a wonderful day and I hope you to be happy:)

ps. Can I use another DB like MongoDB instead of included DB in bothub?