AttributeError: 'str' object has no attribute 'append'
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.
>>> myList = [1, 'from form', [1,2]]
>>> myList[1]
'from form'
>>> myList[2]
[1, 2]
>>> myList[2].append('t')
>>> myList
[1, 'from form', [1, 2, 't']]
>>> myList[1].append('t')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'append'
>>>
If you want to append a value to myList, use myList.append(s)
.
Strings are immutable -- you can't append to them.
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.