AttributeError: 'int' object has no attribute 'append' simple problem with my list

Question

MY CODE:

numbers = [1, 2, 3, 4, 5]
doubled_numbers = []

for num in numbers:
    doubled_numbers = num * 2
    doubled_numbers.append(doubled_numbers)

print(doubled_numbers)

I GOT:

Traceback (most recent call last):
  File "C:/Users/neman/Desktop/Junior Developer Vezbe/list comprehension.py", line 12, in <module>
    doubled_numbers.append([doubled_numbers])
AttributeError: 'int' object has no attribute 'append'

I have no idea why doesn't work, am I missing something or there is a typo? This is a simple thing but it bothers me very much

doubled_numbers = num * 2 will over-write with int value, instead do doubled_numbers.append(num * 2) & remove line above that — sushanth
– sushanth, Commented Aug 20, 2020 at 11:02

Garam Lee · Accepted Answer · 2020-08-20 11:01:50Z

1

doubled_numbers = num*2 overrides the list doubled_numbers into an integer (num*2).

To fix this you will have to change the name of the variable to something like new_number changing your code to:

numbers = [1, 2, 3, 4, 5]
doubled_numbers = []

for num in numbers:
    new_number = num * 2
    doubled_numbers.append(new_number)

print(doubled_numbers)

Also, you could remove a line of code and directly append the value of num*2 to your list:

doubled_numbers.append(num*2)

and then remove the line of code above it.

answered Aug 20, 2020 at 11:01

Garam Lee

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Rabiul Islam · Accepted Answer · 2020-08-20 11:01:56Z

1

you are overriding doubled_numbers in doubled_numbers = num * 2

change variable name like:

for num in numbers:
    doubled_number = num * 2
    doubled_numbers.append(doubled_number)

answered Aug 20, 2020 at 11:01

Rabiul Islam

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