Question

I’m using a python library. I don’t know about the indentation that the writer of that file used.

With gvim i press o and start writing python as indent on in .vimrc.

But if i copy and paste python code in pastebin.com i see indentation difference and get error.

How can i fix python indentation problem in gvim?

Answer 1

Very likely, your source file contains both tabs and spaces.
spaces are the preferred indentation method. (From PEP8)
You can convert all tabs to spaces by using those command:

:set expandtab
:ret!

I suggest put those commands bellow in your .vimrc:

set expandtab softtabstop=4 tabstop=4 shiftwidth=4