If the sum of all factors of a number ( exclusive itself ) is equal to the number, then the number is said to be perfect. E.g 6 ## Steps to Check Perfect Number in Python

1. Take a number as input.
2. Calculate the sum of all its factors(excluding itself)
3. Check if the sum of its factors is equal to the input number.
4. If YES then its a perfect number, else it is not.

## Check Whether a number is Perfect in Python

```num = int(input("Enter a number \n"))
sumOfFactors = 0

#Calculating the sum of Factors
for i in range(1,num):
if num%i == 0:
sumOfFactors += i;

if sumOfFactors == num:
print("Perfect Number")
else:
print("Not a Perfect Number")
```

Output ## Find all Perfect Numbers in the Range

```def isPerfect(num):
sumOfFactors = 0

#Calculating the sum of Factors
for i in range(1,num):
if num%i == 0:
sumOfFactors += i

return sumOfFactors == num

lower = int(input("Enter lower interval \n"))
upper = int(input("Enter upper interval \n"))

print("Perfect Numbers between {x} and {y}:".format(x=lower,y=upper))
for i in range(lower,upper):
if isPerfect(i):
print(i)
```

Output

```Enter lower interval
1
Enter upper interval
100
Perfect Numbers between 1 and 100:
6
28
```

That’s all we need to write in order to check a perfect number in python. If you have any doubt’s then comment below.