Having an error about 'for loop' on python-CodePudding

I want to make a pattern about finding perfect number. This number is; the sum of its divisors must be equal to itself Actually I don't know what is exact problem about. On line 9 it shows my code as wrong.

sayi = int(input("enter a number: "))

bolenler = list()
bolenler = range(0,sayi-1)
bolensayi = list()
toplam = 0

for i in bolenler:
    if(sayi % i == 0):
        bolensayi.append(i)

for i in bolensayi:
    toplam  = i

if(toplam == sayi):
    print("that number is a perfect number")
else:
    print("that number is not a perfect number")

giving that error:

sayınızı giriniz: 6
Traceback (most recent call last):
  File "/home/cagan/Desktop/Python Scratch/mükemmelSayi.py", line 9, in <module>
    if(sayi % i == 0):
ZeroDivisionError: integer division or modulo by zero

Process finished with exit code 1

CodePudding user response：

The reason that you are getting that error is because you cannot divide or modulo a number by zero in python. That error is fixed like so:

sayi = int(input("enter a number: "))

bolenler = list()
bolenler = range(1,sayi-1)
bolensayi = list()
toplam = 0

for i in bolenler:
    if(sayi % i == 0):
        bolensayi.append(i)

for i in bolensayi:
    toplam  = i

if(toplam == sayi):
    print("that number is a perfect number")
else:
    print("that number is not a perfect number")

All I did was change the value of bolenler from range(0,sayi-1) to range(1,sayi-1)

You can also make your code a lot shorter like so:

sayi = int(input("enter a number: "))
toplam = sum([i for i in range(1, sayi-1) if sayi % i == 0])

if(toplam == sayi):
    print("that number is a perfect number")
else:
    print("that number is not a perfect number")

CodePudding user response：

As mentioned in the built-in exceptions, you can't have the second argument as 0. the variable bolenler that you're looping over begins with 0. Initiating the variable as bolenler = range(1,sayi-1) should fix it.