AttributeError str object has no attribute append

Question

gt  gt  gt  myList 1   from form   gt  gt  gt  myList 1  append s   Traceback  most recent call last     File   lt pyshell 144 gt    line 1  in  lt module gt      myList 1  append s  AttributeError   str  object has no attribute  append   gt  gt  gt    Why myList 1  is considered a  str  object  mList 1  returns the first item in the list  from form  but I cannot append to item 1 in the list myList  Thank you    Edit01    pyfunc  Thank you for the explanation  now I understand    I need to have a list of lists  so  from form  should be a list  I did this  please correct if this not the right way     gt  gt  gt  myList  1   from form    1  2   t     gt  gt  gt  s   myList 1   gt  gt  gt  s  from form   gt  gt  gt  s    myList 1    gt  gt  gt  s   from form    gt  gt  gt  myList 1    s  gt  gt  gt  myList  1    from form     1  2   t     gt  gt  gt

User · Answer

Why myList 1  is considered a  str  object    Because it is a string  What else is  from form   if not a string   Actually  strings are sequences too  i e  they can be indexed  sliced  iterated  etc  as well - but that s part of the str class and doesn t make it a list or something       mList 1  returns the first item in the list  from form    If you mean that myList is  from form   no it s not    The second  indexing starts at 0  element is  from form   That s a BIG difference  It s the difference between a house and a person   Also  myList doesn t have to be a list from your short code sample - it could be anything that accepts 1 as index - a  dict with 1 as index  a list  a tuple  most other sequences  etc  But that s irrelevant      but I cannot append to item 1 in the list myList   Of course not  because it s a string and you can t append to string  String are immutable  You can concatenate  as in   there s a new object that consists of these two   strings  But you cannot append  as in   this specific object now has this at the end   to them

User · Answer

If you want to append a value to myList  use myList append s    Strings are immutable -- you can t append to them

User · Answer

What you are trying to do is add additional information to each item in the list that you already created so       alist   from form    stuff 2    stuff 3        for j in range  0 len alist            temp             temp append alist j     alist 0  is  from form           temp append  t     slot for first piece of data  t          temp append  -     slot for second piece of data      blist append temp         will be alist with 2 additional fields for extra stuff assocated with each item in alist

User · Answer

This is simple program showing append  t   to the list      n   f   g   h   i   k    for i in range 1       temp        temp append n -2        temp append  t       print temp    Output     i    k     t

User · Answer

myList 1  is an element of myList and it s type is string   myList 1  is str  you can not append to it  myList is a list  you should have been appending to it    gt  gt  gt  myList    1   from form    1 2    gt  gt  gt  myList 1   from form   gt  gt  gt  myList 2   1  2   gt  gt  gt  myList 2  append  t    gt  gt  gt  myList  1   from form    1  2   t     gt  gt  gt  myList 1  append  t   Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  AttributeError   str  object has no attribute  append   gt  gt  gt

[python] AttributeError: 'str' object has no attribute 'append'

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