为什么二进制数的str（num）只返回特定的数字作为字符串？

Question

I have a number 000000000000001011 and I want to iterate over this. I used str(num) to iterate over it but it returns '11' as output string. Why does this happen?

Answer 1

There's a couple of things at play here.

First, when the number is input, it is converted from string to integer format with the number-system specified (or that's my understanding from the question anyway):

number = int( user_input_str, 2 )  # user_input_str given in binary

But once it's stored internally, extraneous digits (for all intents and purposes) are now gone.

To iterate over the digits, you'd need to convert it back to a binary string:

number_str = '{0:b}'.format( number ).zfill( 18 )

or without leading zeros:

number_str = '{0:b}'.format( number )

This can then be iterated over easily:

for digit in number_str:
    # do whatever with each digit

Failing all that, just iterate over the user's input without the in-between conversion steps.