How to reset index in a pandas data frame?

I have a data frame from which I remove some rows. As a result, I get a data frame in which index is something like that: [1,5,6,10,11] and I would like to reset it to [0,1,2,3,4]. How can I do it?

The following seems to work:

    df = df.reset_index()
    del df['index']

The following does not work:

    df = df.reindex()

reset_index() is what you're looking for. If you don't want it saved as a column, then do:

    df = df.reset_index(drop=True)