CODEWITHSUNDEEP
pythonnonetype
Queenie Zhang
Queenie Zhang

Reputation: 1

why when i run it ,it turns out to be 'NoneType' object has no attribute 'append'

def collatz_list(n):
 int_list = [n]
 int_index = n
 while int_index >1 :
     if int_index % 2 == 0:
         int_index = int_index / 2
         int_list = int_list.append(int_index)
     else:
         int_index = 3 * int_index  1
         int_list = int_list.append(int_index)
 return int_list

why when i run it ,it turns out to be NoneType object has no attribute append

Upvotes: 0

Views: 74

Answers (1)

FatalError
FatalError

Reputation: 54551

.append() does not return the list, it returns None. There's no need to assign back to int_list anyway, just int_list.append(int_index) would be fine.

Upvotes: 4

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