TypeError: 'builtin_function_or_method' object is not subscriptable

Question

elif( listb[0] == "-test"):
    run_all.set("testview")
    listb.pop[0]

ERROR: Exception in Tkinter callback Traceback (most recent call last): File "/tools/python/2.7.2/lib/python2.7/lib-tk/Tkinter.py", line 1410, in call return self.func(*args) File "./edit.py", line 581, in populate listb.pop[0] TypeError: 'builtin_function_or_method' object is not subscriptable

The line # 581 is represented by last pop statement in the code above. run_all is a StringVar.

Why am I getting this error and how can it be solved?

Answer 1

I think you want

listb.pop()[0]

The expression listb.pop is a valid python expression which results in a reference to the pop method, but doesn't actually call that method. You need to add the open and close parentheses to call the method.

Answer 2

You are trying to access pop as if was a list or a tupple, but pop is not. It's a method.

Answer 3

instead of writing listb.pop[0] write

listb.pop()[0]
         ^
         |

Answer 4

Looks like you typed brackets instead of parenthesis by mistake.

Answer 5

This error arises when you don't use brackets with pop operation. Write the code in this manner.

listb.pop(0)

This is a valid python expression.

Answer 6

FYI, this is not an answer to the post. But it may help future users who may get the error with the message:

TypeError: 'builtin_function_or_method' object is not subscriptable

In my case, it was occurred due to bad indentation.

Just indenting the line of code solved the issue.