Pythonic way to check if integer fits in 64 bits

Question

What is the Pythonic way (without using any external libraries) to check if an integer is small enough to fit in a 64 bit signed quantity?

Sorry if this question has been asked before!

Answer 1

Just check the size with the int.bit_length() method:

if integer_value.bit_length() <= 63:

The method takes the absolute value, so you want to leave a bit for the sign:

>>> (-2 ** 63).bit_length()
64
>>> (2 ** 63).bit_length()
64