How Can I Pad a String with Leading Zeros in Python?

Padding a String with Zeros

Padding zeros to the left of a numeric string can be useful for ensuring a consistent length. There are several methods to achieve this in Python:

Padding Strings:

Use the zfill() method on a string to add leading zeros:

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

Padding Numbers:

For numbers, use the string formatting operator (f-string):

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

Alternatively, use the % operator or the format() function:

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

You can also use dictionary-style formatting:

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

Or, use the placeholder syntax with format strings:

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

The 03 in the formatting string specifies the desired width of the padded string, and the 0 signifies that it should be padded with zeros.

Refer to the String formatting documentation for more information on all available formatting options.

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