int format for 001 - 999

[jmair]

Is there a build it method to do the following?

num = 001

num += 1

print(str(num))

result: 002

currently I get an 'Invalid token' error with 001 as a variable

I'm just looking for a way to count 001, 002 - 999. Rather not reinvent the wheel if something already exists.

Thanks!