update exif time with file time using exiftool

main.py

import glob
import exifread
import os.path, time
import subprocess
import os
import json


class ExifTool(object):

    sentinel = "{ready}\n"

    def __init__(self, executable="/usr/local/bin/exiftool"):
        self.executable = executable

    def __enter__(self):
        self.process = subprocess.Popen(
            [self.executable, "-stay_open", "True",  "-@", "-"],
            universal_newlines=True,
            stdin=subprocess.PIPE, stdout=subprocess.PIPE)
        return self

    def  __exit__(self, exc_type, exc_value, traceback):
        self.process.stdin.write("-stay_open\nFalse\n")
        self.process.stdin.flush()

    def execute(self, *args):
        args = args + ("-execute\n",)
        self.process.stdin.write(str.join("\n", args))
        self.process.stdin.flush()
        output = ""
        fd = self.process.stdout.fileno()
        while not output.endswith(self.sentinel):
            output += os.read(fd, 4096).decode('utf-8')
        return output[:-len(self.sentinel)]

    def get_metadata(self, *filenames):
        return json.loads(self.execute("-G", "-j", "-n", *filenames))

filelst = glob.glob("Documents/weixin/*.jpg")
# print(filelst)
passedfile = []
processedfile = []

for img in filelst:
    with ExifTool() as e:
        metadata = e.get_metadata(img)[0]
        if metadata.get('EXIF:DateTimeOriginal') is not None:
            print("PASS:" + metadata.get('EXIF:DateTimeOriginal'))
            passedfile.append(img)
        else:
            print("###No DATA, start to update###")
            filemtime = metadata.get('File:FileModifyDate')
            e.execute("-DateTimeOriginal="+filemtime, "-filemodifydate="+filemtime,img)
            processedfile.append(img)