Resize jpeg files by size in a given folder in Python

resizer.py

from PIL import Image
import datetime
import os.path
import glob
import time
import PIL
import os


def modification_date(filename):
    _t_ = os.path.getmtime(filename)
    datetime.datetime.fromtimestamp(_t_)
    assert isinstance(_t_, object)
    return _t_


START_TIME = time.time()

NAME = []
TIME = []

for Filename in glob.glob('*.JPG'):
    # print Filename
    NAME.append(Filename)
    modificationTime = modification_date(Filename)
    # print modificationTime
    TIME.append(modificationTime)

for Filename in glob.glob('*.jpg'):
    # print Filename
    NAME.append(Filename)
    modificationTime = modification_date(Filename)
    # print modificationTime
    TIME.append(modificationTime)

print('--------------------------------------------------')

ARRAYSIZE = len(NAME)

TIME, NAME = zip(*sorted(zip(TIME, NAME)))

print('Number of jpg files in the folder: ' + str(ARRAYSIZE))

print('--------------------------------------------------')

HALF = 0.5  # percentage of size reduction (0.5 = 50%)

for op in range(0, int(ARRAYSIZE), 1):
    TempImg = Image.open(NAME[op])
    out = TempImg.resize(([int(HALF * s) for s in TempImg.size]), PIL.Image.ANTIALIAS)
    out.save(NAME[op] + '_resized_.jpg')
    out.close()
    time.sleep(0.2)  # delays for 0.2 seconds
ELAPSED_TIME = time.time() - START_TIME

print('Elapsed time: ' + str(round(ELAPSED_TIME, 2)) + ' sec')