How to pad zeroes to a string?

Question

What is a Pythonic way to pad a numeric string with zeroes to the left, i.e. so the numeric string has a specific length?

Answer 1

Its ok too:

 h = 2
 m = 7
 s = 3
 print("%02d:%02d:%02d" % (h, m, s))

so output will be: "02:07:03"