How do I use string formatting to show BOTH leading zeros and precision of 3?

Question

I'm trying to represent a number with leading and trailing zeros so that the total width is 7 including the decimal point. For example, I want to represent "5" as "005.000". It seems that string formatting will let me do one or the other but not both. Here's the output I get in Ipython illustrating my problem:

In [1]: '%.3f'%5
Out[1]: '5.000'

In [2]: '%03.f'%5
Out[2]: '005'

In [3]: '%03.3f'%5
Out[3]: '5.000'

Line 1 and 2 are doing exactly what I would expect. Line 3 just ignores the fact that I want leading zeros. Any ideas? Thanks!

Answer 1

The first number is the total number of digits, including decimal point.

>>> '%07.3f' % 5
'005.000'

Answer 2

[Edit: Gah, beaten again]

'%07.3F'%5

The first number is the total field width.