How to format an integer in Python

I have the numbers.
‘115000000000’
‘10000000’
‘99700000000’

I need to make them look like this:
‘1150,00000000’
‘0,10000000’
‘997,00000000’

or
‘1150’
‘0,1’
‘997’

>Solution :

n = ['115000000000', '10000000', '99700000000']
nn= [str(  float(float(element)/100000000)   ) for element in n]

results in nn to be:

['1150.0', '0.1', '997.0']