my program shows unexpected token error. why?

Question

the program needs to return true if the factors of n other than n sum up to n. i need to use the function name during runtime. when i input

factors(45)

it shows that there is an unexpexted token error. please check what is wrong with the program.

def factors(n):#unexpected token error
 factorlist = []
 for i in range(1,n):
  if n%i == 0:
    factorlist = factorlist + [i]
 return(factorlist)
def perfect(n):
 if sum(factorlist) == n:
  return(True)
 else :
  return(False)

factorlist not referenced in perfect(n) function. May be you wanted factorlist = factors(n) ? — Tushar Gupta
– Tushar Gupta, Commented Aug 6, 2017 at 9:27
can u do the correction in the program. i am not able to get it. im just beginning to learn python. please — Benetha Thambi
– Benetha Thambi, Commented Aug 6, 2017 at 9:37
Are you using Python 3? If so, to read a number from the user at runtime you can do n = int(input('Enter number ')). — PM 2Ring
– PM 2Ring, Commented Aug 6, 2017 at 10:01

Md. Rezwanul Haque · Accepted Answer · 2017-08-06 09:42:04Z

1

You do not call factors(n) into the perfect(n) function. So, you have to use factorlist = factors(n) into the perfect(n) function.

and then try this way :

def factors(n):
  factorlist = []
  for i in range(1, n):
    if n % i == 0:
      factorlist = factorlist + [i]
  return (factorlist)


def perfect(n):
  factorlist = factors(n)  # use this line
  if sum(factorlist) == n:
    return (True)
  else:
    return (False)

print(perfect(45)) # Ouput : False

edited Aug 6, 2017 at 9:42

answered Aug 6, 2017 at 9:24

Md. Rezwanul Haque

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1 Comment

Md. Rezwanul Haque Over a year ago

Copy my code and run in the compiler. I think, this code is right and there is no bug.

Pravitha V · Accepted Answer · 2017-08-06 10:13:50Z

0

Try :

def factors(n):
    factorlist = []
    for i in range(1,n):
        if n%i == 0:
            factorlist = factorlist + [i]
    print factorlist
    return factorlist

def perfect(n):
    factorlist = factors(n)
    if sum(factorlist) == n:
        return True
    else :
        return False

n = int(raw_input('Enter the number: '))
print(perfect(n))

Output:

edited Aug 6, 2017 at 10:13

answered Aug 6, 2017 at 9:35

Pravitha V

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8 Comments

Benetha Thambi Over a year ago

it did not work. same error, how to use an argument in a function?

Pravitha V Over a year ago

@ Benetha, both mine and Md. Rezwanul Haque answers are working and giving output, please try once again. Or post the exact error and code you are trying.

Benetha Thambi Over a year ago

i need to input the number for what sum has to be calculated only during runtime. how should i change the print command

Pravitha V Over a year ago

you can use "raw_input" to input values dynamically , see my updated answer

Benetha Thambi Over a year ago

the runtime command should be>>> perfect(28) true

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