pad zeros to a string python
my_str='9'
my_str.zfill(2)python add zero to string
# add zeros to numbers
>>> n = 4
>>> print(f'{n:03}') # Preferred method, python >= 3.6
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>>> print('%03d' % n)
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>>> print(format(n, '03')) # python >= 2.6
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>>> print('{0:03d}'.format(n)) # python >= 2.6 + python 3
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>>> print('{foo:03d}'.format(foo=n)) # python >= 2.6 + python 3
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>>> print('{:03d}'.format(n)) # python >= 2.7 + python3
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