脚本编写面试题, 请写一个 Python 脚本,计算一个目录下所有文件的总大小.

 
import os
 
def list_files(directory):
    for dirpath, dirnames, filenames in os.walk(directory):
        for dirname in dirnames:
            print(os.path.join(dirpath, dirname))
        for filename in filenames:
            print(os.path.join(dirpath, filename))
 
if __name__ == '__main__':
    directory = input('请输入目录路径: ')
    list_files(directory)
 

 
import hashlib
 
 def get_md5(file_path):
    md5_hash = hashlib.md5()
    with open(file_path, 'rb') as f:
        for chunk in iter(lambda: f.read(4096), b''):
            md5_hash.update(chunk)
    return md5_hash.hexdigest()
 
if __name__ == '__main__':
    file_path = input('请输入文件路径: ')
    print(f'MD5 校验和: {get_md5(file_path)}')
 

 
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
 
class Watcher:
    def __init__(self, directory_to_watch):
        self.DIRECTORY_TO_WATCH = directory_to_watch
        self.observer = Observer()
 
    def run(self):
        event_handler = Handler()
        self.observer.schedule(event_handler, self.DIRECTORY_TO_WATCH, recursive=True)
        self.observer.start()
        try:
            while True:
                time.sleep(5)
        except:
            self.observer.stop()
            print('观察已停止')
        self.observer.join()
 
class Handler(FileSystemEventHandler):
    @staticmethod
    def on_any_event(event):
        if event.is_directory:
            return None
        elif event.event_type == 'created':
            print(f'收到创建事件 - {event.src_path}')
        elif event.event_type == 'modified':
            print(f'收到修改事件 - {event.src_path}')
 
if __name__ == '__main__':
    w = Watcher('需要监控的目录路径')
    w.run()
 

 
import os
 
for f in os.listdir('/path/to/directory'):
    file_path = os.path.join('/path/to/directory', f)
    if os.path.isfile(file_path):
        print(f'{f}: {os.path.getsize(file_path)} bytes')