How do I format a number with a variable number of digits in Python?

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If you are using it in a formatted string with the format() method which is preferred over the older style ''% formatting

>>> 'One hundred and twenty three with three leading zeros {0:06}.'.format(123)
'One hundred and twenty three with three leading zeros 000123.'

See
http://docs.python.org/library/stdtypes.html#str.format
http://docs.python.org/library/string.html#formatstrings

Here is an example with variable width

>>> '{num:0{width}}'.format(num=123, width=6)
'000123'

You can even specify the fill char as a variable

>>> '{num:{fill}{width}}'.format(num=123, fill="0", width=6)
'000123'

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