database/get_holdings_by_specific_species_across_taxonomies.py
def is_file(filename):
    """check if something is a file"""
    if not os.path.isfile:
        msg = "{0} is not a file".format(filename)
        raise argparse.ArgumentTypeError(msg)
    else:
        return filename
check if something is a file
check if something is a file
check if something is a file
def is_file(filename):
    if not os.path.isfile:
        msg = "{0} is not a file".format(filename)
        raise argparse.ArgumentTypeError(msg)
    else:
        return filename
def is_file ( filename ) : if not os . path . isfile : msg = "{0} is not a file" . format ( filename ) raise argparse . ArgumentTypeError ( msg ) else : return filename
check if something is a file
check if something is a file
"""check if something is a file"""
filename