Normalize dropbox photo names

photo_names.py

import os
import re

# '20161121_001122.jpg' -> '2016-11-21 00.11.22.jpg'

TARGET = '%s/Dropbox/Camera Uploads' % os.path.expanduser('~')

PATTERN = re.compile(r'^(?P<year>\d\d\d\d)'
                     r'(?P<month>\d\d)'
                     r'(?P<day>\d\d)_'
                     r'(?P<hour>\d\d)'
                     r'(?P<minute>\d\d)'
                     r'(?P<second>\d\d)'
                     r'(?P<trail>.*)$')

def format_name(year, month, day, hour, minute, second, trail):
    return '%(year)s-%(month)s-%(day)s ' \
           '%(hour)s.%(minute)s.%(second)s%(trail)s' \
            % locals()

def rename(a, b):
    aa = os.path.join(TARGET, a)
    bb = os.path.join(TARGET, b)
    print '%s -> %s' % (aa, bb)
    os.rename(aa, bb)


def list_files():
    return os.listdir(TARGET)


def main():
    for filename in list_files():
        mo = PATTERN.match(filename)
        if mo is None:
            continue
        a = filename
        b = format_name(**mo.groupdict())
        rename(a, b)


if __name__ == '__main__':
    main()