How to pad a numeric string with zeros to the right in Python?

Question

Python strings have a method called zfill that allows to pad a numeric string with zeros to the left.

In : str(190).zfill(8)
Out: \'00000190\'
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Answer 1

Hint: The string can be inverted twice: before and after using the zfill method:

In : acc = '991000'

In : acc[::-1].zfill(9)[::-1]
Out: '991000000'

Or even more easier:

In : acc.ljust(9, '0')
Out: '991000000'