"""Fetches rows from a Bigtable.
Retrieves rows pertaining to the given keys from the Table instance
represented by big_table.  Silly things may happen if
other_silly_variable is not None.
Args:
    big_table: An open Bigtable Table instance.
    keys: A sequence of strings representing the key of each table row
        to fetch.
    other_silly_variable: Another optional variable, that has a much
        longer name than the other args, and which does nothing.
Returns:
    A dict mapping keys to the corresponding table row data
    fetched. Each row is represented as a tuple of strings. For
    example:
    {'Serak': ('Rigel VII', 'Preparer'),
     'Zim': ('Irk', 'Invader'),
     'Lrrr': ('Omicron Persei 8', 'Emperor')}
    If a key from the keys argument is missing from the dictionary,
    then that row was not found in the table.
Raises:
    IOError: An error occurred accessing the bigtable.Table object.
"""
Docstrings - one line vs multiple line