Steps to reproduce

1. Create two equal objects. E. g.:

user1 = User(id=1, first_name="Equal", last_name="Identical", username="same", type=None, bot=None)
user2 = User(id=1, first_name="Equal", last_name="Identical", username="same", type=None, bot=None)

2. Compare the objects: assert user1 == user2

Expected behaviour

The assertion should pass: The equality comparison should return True.

Actual behaviour

The assertion fails:

>       assert user1 == user2
E       assert <telegram.use...at 0x041006F0> == <telegram.user...at 0x041006D0>

Configuration

Operating System:
Windows 10

Version of Python, python-telegram-bot & dependencies:
Python 3.6.1
python-telegram-bot commit 4541476

Possible fix

Implementing the rich comparison method __eq__ for the class. Implementing __hash__ alongside might be a good idea.

Notes

This probably not only holds for the User object, but for all Telegram objects.