python - How can I find the credit card balance regarding my code? -

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def balance (p, apr, mo): mpr = 0.01*apr/12 month in range(int(mo)):     p= p+p*mpr     return p

i'm beginner trying create function return balance on credit card starting balance p , interest rate apr after mo months. when run code, seems loop not work.

 def balance (p, apr, mo):     mpr = 0.01*apr/12.0     month in range(int(mo)):         p= p+p*mpr     return p   in range(1,13):     print balance(1000,10,i)

strictly mpr not correct (monthly compounding simplification justified in times before slide rules); monthly rate should 12th root of annual rate; see continous compounding https://en.wikipedia.org/wiki/compound_interest

def balance2 (p, apr, mo):     mpr =  ((1+apr/100.0)**(1/12.0)-1)     month in range(int(mo)):         p= p+p*mpr     return p  print  in range(1,13):     print balance2(1000,10,i)

output:

1008.33333333 1016.73611111 1025.20891204 1033.75231964 1042.3669223 1051.05331332 1059.81209093 1068.64385836 1077.54922384 1086.52880071 1095.58320738 1104.71306744  1007.97414043 1016.01186777 1024.11368908 1032.28011546 1040.51166206 1048.80884817 1057.17219721 1065.60223677 1074.09949864 1082.66451888 1091.29783779 1100.0

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