How Can I Add Leading Zeros to Numeric Strings in Python?

Zero-Padding Numeric Strings

To add leading zeros to a numeric string, enhancing its length, multiple approaches can be employed in Python:

Padding Strings:

For string padding, the zfill method is utilized:

n = '4'
print(n.zfill(3))  # Output: 004

Padding Numbers:

Various methods can be used to pad numbers:

• f-Strings (Preferred for Python >= 3.6):

n = 4
print(f'{n:03}')  # Output: 004

• Modulo Operator:

print('%03d' % n)  # Output: 004

• format Function (Python >= 2.6):

print(format(n, '03'))  # Output: 004
print('{0:03d}'.format(n))  # Output: 004
print('{foo:03d}'.format(foo=n))  # Output: 004

• format_spec Mini-Language (Python >= 2.7 Python 3):

print('{:03d}'.format(n))  # Output: 004

Consult the String Formatting documentation for further details.

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