appending list but error NoneType object has no attribute append

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

User · Answer

list is mutable  Change   last list last list append p last name    to   last list append p last name    will work

User · Answer

I think what you want is this   last list    if p last name    None and p last name            last list append p last name  print last list   Your current if statement   if p last name    None or p last name            pass   Effectively never does anything   If p last name is none or the empty string  it does nothing inside the loop   If p last name is something else  the body of the if statement is skipped   Also  it looks like your statement pan list append p last  is a typo  because I see neither pan list nor p last getting used anywhere else in the code you have posted

User · Answer

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

User · Answer

You are not supposed to assign it to any variable  when you append something in the list  it updates automatically  use only -  last list append p last    if you assign this to a variable  last list  again  it will no more be a list  will become a none type variable since you haven t declared the type for that  and append will become invalid in the next run

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

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