I am surprised there is no mention of a nice way to accomplish this using formatting strings that are supported in Python 3.6 and higher. TLDR:

>>> number = 1>>> f'0b{number:08b}''0b00000001'

Longer story

This is functionality of formatting strings available from Python 3.6:

>>> x, y, z = 1, 2, 3>>> f'{x} {y} {2*z}''1 2 6'

You can request binary as well:

>>> f'{z:b}''11'

Specify the width:

>>> f'{z:8b}''      11'

Request zero padding:

f'{z:08b}''00000011'

And add common prefix to signify binary number:

>>> f'0b{z:08b}''0b00000011'

You can also let Python add the prefix for you but I do not like it so much as the version above because you have to take the prefix into width consideration:

>>> f'{z:#010b}''0b00000011'

More info is available in official documentation on Formatted string literals and Format Specification Mini-Language.