appending list but error 'NoneType' object has no attribute 'append' [duplicate]

Question

I have a script in which I am extracting value for every user and adding that in a list but I am getting "'NoneType' object has no attribute 'append'". My code is like

last_list=[] if p.last_name==None or p.last_name=="":      pass last_list=last_list.append(p.last_name) print last_list 

I want to add last name in list. If its none then dont add it in list . Please help Note:p is the object that I am using to get info from my module which have all first_name ,last_name , age etc.... Please suggest ....Thanks in advance

Answer 1

list is mutable

Change

last_list=last_list.append(p.last_name) 

to

last_list.append(p.last_name) 

will work

Answer 2

When doing pan_list.append(p.last) you're doing an inplace operation, that is an operation that modifies the object and returns nothing (i.e. None).

You should do something like this :

last_list=[] if p.last_name==None or p.last_name=="":      pass last_list.append(p.last)  # Here I modify the last_list, no affectation print last_list