add zeros to int python code example
Example 1: python add zero to string
# add zeros in front of a string
>>> n = '4'
>>> print(n.zfill(3))
004
Example 2: how to append leading zeros in python
str.zfill(width)
Example 3: how to add extra zeros after decimal in python
>>> format(2.0, '.6f')
'2.000000'