Using functions in 'while' loop python -

so want create code calculate minimum monthly payment , remaining balance, given annual interest rate, principal amount , monthly payment rate. desired output is:

      month: 1       minimum monthly payment: 168.52       remaining balance: 4111.89       month: 2       minimum monthly payment: 164.48       remaining balance: 4013.2 

and on until month 12.

i know there's way without defining functions whole function thing messing me wanted try it. current code -

        a=0         while a<=11:             def min_mth_pay(balance,monthlypaymentrate):                 x = balance * monthlypaymentrate                 return x             def balance(balance,min_mth_pay,annualinterestrate):                 y=(balance - min_mth_pay)*((annualinterestrate/12)+1)                 return y             +=1             print('month:' + str(a) + 'minimum monthly payment:' + str(x) + 'remaining balance:' + str('y'))   

i'm not sure if can use functions in such format? error pops out saying name 'x' undefined. new @ python here appreciate clarifications! :)

you're confusing defining functions calling them. should define functions separately, call them within loop.

def min_mth_pay(balance,monthlypaymentrate):     x = balance * monthlypaymentrate     return x  def balance(balance,min_mth_pay,annualinterestrate):     y=(balance - min_mth_pay)*((annualinterestrate/12)+1)     return y   a=0 while a<=11:     +=1     x = min_mth_pay(balance,monthlypaymentrate)     y = balance(balance,min_mth_pay,annualinterestrate)      print('month:' + str(a) + 'minimum monthly payment:' + str(x) + 'remaining balance:' + str(y))  

note it's not clear balance, monthlypaymentrate, min_mth_pay, , annualinterestrate coming in code.