Append in list beginner

1

Hello,everyone!I know it is a simple question ,but I am a kettle)Why does Pycharm print"None" when I run such a code?

t1=[1,2,3]
t2=t1.append(5)
print(t2)
2

Hi, you must print “t1” not “t2”

2 Likes
3

Python’s list.append method mutates the list in-place. Python methods that mutate their receivers will always return None.

1 Like
4

Exactly! Like so…

‘’’
t1=[1,2,3]
t1.append(5)
print(t1)
‘’’

See also @chuckadams explanation.