Xiaobai would like to ask you, why does this code each print twice?

the following is the code

def collatz(number):
    if number%2==0:
        number=number//2
        print(str(number))
        return number
    else:
        number=number*3+1
        print(str(number))
        return number
print("enter your number")
number=int(input())
while number!=1:
    collatz(number)
    number=collatz(number)

this is the result
enter your number
5
16
16
8
8
4
4
2
2
1

Mar.21,2021

change it to:

  

function called

twice
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