How to pad 0s into a numeric string to ensure uniform length

Is there any way to fill the left side of a string with 0s so that it has a specific length?

String

n = '5'
print n.zfill(3)
005

t = 'test'
print(t.rjust(10, '0'))

Number

n = 4
print('%03d' % n)
004

format

print(format(4, '03')) # python >= 2.6
 
print("{0:03d}".format(4))  # python >= 2.6
 
print("{0:03d}".format(4))  # python 3

: The padding character after the sign can only be one character. If not specified, it will be filled with spaces by default, followed by the guaranteed number of padding digits

b, d, o , x are binary, decimal, octal, and hexadecimal respectively.

Precision is often used together with type f, and the number can also be used as the thousands separator for amounts.

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