AT
#!/usr/bin/python3
def do(n):
p, q = divmod(n, 100)
s = str(p * 100)[:-2]+str(100 + q)[1:]
print(n, s)
list(map(do, (3, 23, 123, 9123, 999123)))
>>> x = 123
>>> y = 23
>>> z = 3
>>> f = lambda v: f'{v:02}'
>>> f(x)
'123'
>>> f(y)
'23'
>>> f(z)
'03'
>>>