Rename files based on timestamp info

rename_to_time.py

#!/usr/bin/env python

from dateutil import parser
from dateutil.tz import gettz
import csv
import os
import sys


FORMAT = '%Y-%m-%d %H.%M.%SZ.pdf'
UTC = gettz('UTC')


class RenameError(Exception):
    pass


def main():
    if len(sys.argv) < 3:
        sys.stdout.write(
            """
Usage: {0} CSV_FILE FILES_DIR

Renames files based on timestamps in a csv file.  Files are renamed to the
equivalent UTC value of the timestamp.

Example csv content:

name,time
2007 partitionA_Part1.pdf,2007-09-12 20.29.20 -0400
2007 partitionA_Part2.pdf,2007-08-17 13.37.07 -0400
2007 partitionA_Part4.pdf,2007-04-11 10.08.49 -0400
2007 partitionA_Part5.pdf,2007-03-28 23.33.36 +0000
...

"""[1:].format(sys.argv[0])
        )
        sys.exit(0)

    csv_file = sys.argv[1]
    files_path = sys.argv[2].rstrip('/')

    with open(csv_file, 'r') as f:
        rs = list(csv.DictReader(f))

    for line, r in enumerate(rs, 2):
        try:
            date = parser.parse(r['time'].replace('.', ':'))
        except ValueError:
            sys.stderr.write('Error on line {0}: '.format(line))
            raise

        date = date.astimezone(UTC)

        old_name = r['name']
        old_path = '{files_path}/{old_name}'.format(
            files_path=files_path,
            old_name=old_name,
        )
        new_name = date.strftime(FORMAT)
        new_path = '{files_path}/{new_name}'.format(
            files_path=files_path,
            new_name=new_name,
        )

        try:
            os.rename(old_path, new_path)
        except OSError as e:
            if e.errno == 2:
                sys.stderr.write('Error on line {line}: file "{old_path}" not found!\n'.format(
                    line=line,
                    old_path=old_path,
                ))
            else:
                raise

if __name__ == '__main__':
    main()