Question

I found some code that helped me to accomplish incrementing (numerically) files in a particular folder. However, I don’t understand why [0] was used in a certain section in the code. Here is a portion of the code, thanks:

...
...
numList = [0]
for dlogs in sampleList:
    i = os.path.splitext(dlgs)[0] #Why here?
    try:
        num = re.findall('[0-9]+$', i)[0]    # and here?
        numList.append(int (num))

        ...
        ...
        ...

I understand crystal clear now. I could not see that before … thanks. For those who voted my question down, everyone has to start somewhere. If my question seemed too elementary, why not conserve your energy and just skip my question.

Answer 1

In the lines you ask about, those functions return lists, and the first item (index 0) of each list is being assigned to a variable. For example:

>>> os.path.splitext("foo.txt")
('foo', '.txt')
>>> ('foo', '.txt')[0]
'foo'