stringformattingpython-3.xstring-formattingfixed-width

Fixed width number formatting python 3

How do I get an integer to fill 0's to a fixed width in python 3.2 using the format attribute? Example:

a = 1
print('{0:3}'.format(a))

gives ' 1' instead of '001' I want. In python 2.x, I know that this can be done using 

print "%03d" % number.

I checked the python 3 string documentation but wasn't able to get this.

http://docs.python.org/release/3.2/library/string.html#format-specification-mini-language

Thanks.

Solution

  • Prefix the width with a 0:

    >>> '{0:03}'.format(1)
'001'

    Also, you don't need the place-marker in recent versions of Python (not sure which, but at least 2.7 and 3.1):

    >>> '{:03}'.format(1)
'001'