Python list append to list "AttributeError: 'tuple' object has no attribute 'append'"

Question

Alright so I know you cannot append a tuple to a list. However I am still receiving this error despite my best efforts. Can someone tell me what I am doing wrong or what is going on?

Traceback (most recent call last): File "C:/Users/.py", line 31, in listRow.append(convertedList) AttributeError: 'tuple' object has no attribute 'append'

followedBy is a string that comes from a cursor and is split into a list form. Below is some sample data that the cursor would contain.

followedBy = "0| 1| 2| 40"

table = [] #contains all rows (table)
row = [] #contains row
listFollowedBy = [] #contains ids 

for (var1, var2, var3, followedBy) in cursor:
   row = var1, var2, var3
   listFollowedBy = followedBy.split("| ") #Thought split always split the data into lists
   convertedList = list(listFollowedBy) #Threw this in there just to insure it was converted to a list
   row.append(convertedList)

   table.append(row)

Split does split as a list, you just can't keep track of your variables because they all have similar names. — Malik Brahimi
– Malik Brahimi, Commented Mar 12, 2015 at 1:32
Make sure you fix followed by. It looks like it should be a string. — Malik Brahimi
– Malik Brahimi, Commented Mar 12, 2015 at 1:35
row is a tuple as defined at the moment (you bind it to a list and then you rebind it to a tuple within your for suite). Change to row = [var1, var2, var3] — Vidhya G
– Vidhya G, Commented Mar 12, 2015 at 1:41
That was a typo in the question.This reflects more code more closely. — user3586062
– user3586062, Commented Mar 12, 2015 at 1:44
Row is a tuple! You're appending a list to a tuple. No can do! — Malik Brahimi
– Malik Brahimi, Commented Mar 12, 2015 at 1:45

Malik Brahimi · Accepted Answer · 2015-03-12 01:47:32Z

2

Tuples are immutable meaning they can't be changed unless reassigned. You can however add tuples to a list because lists are mutable, meaning they can be changed. You need to edit the order of your append.

listFollowedBy.append(row)

As of now, your row is a tuple. Tuples don't have an append method, lists do. Why are you appending a list to a tuple instead of a tuple to a list? You've got the method call backwards.

edited Mar 12, 2015 at 1:47

answered Mar 12, 2015 at 1:30

Malik Brahimi

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2 Comments

user3586062 Over a year ago

Its not a tuple its a list. Split should split it to a list. I also even converted it to a list just to double check

Malik Brahimi Over a year ago

@user3586062 You don't understand. The append method is called on the list not the tuple.

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