需要在文件夹中获得最近上传的图像名称。我希望将其重命名并替换到同一文件夹中

Question

我使用下面的代码来访问文件夹中最后修改过的图像文件。

由于3-4图像将在一分钟内上传，我想获得访问所有的3-4文件和重命名。我希望在将新图像添加到文件夹后立即运行相同的进程。

import pandas as pd
import glob
import os
import os.path

#Find the last updated Image

folder_path = r'C:\Users\folder\path\for\images' 
file_type = '\*jpg' 
files = glob.glob(folder_path + file_type)
max_file = max(files, key = os.path.getctime)
print(max_file)

#Load the last updated engine number

df = pd.read_excel("g-ng.xlsx")
engine_no = df['engine_no'].iloc[-1]
print(engine_no)

#create new name for the file
new_fol_path = r'C:\Users\folder\path\for\images' "\\"
new_name = new_fol_path + engine_no + ".jpg"
print(new_name)

renamed = os.rename(max_file,new_name)
print(renamed)

Answer 1

您好，不知道我是否理解正确，但如果您想在img文件进入目录后立即更改它的名称，有一种方法可以使用watchdog libery来完成此操作

在这里查看docomantaion https://pypi.org/project/watchdog/

pip install watchdog

然后像这样使用它

import watchdog.events
import watchdog.observers
import time
  
  
class Handler(watchdog.events.PatternMatchingEventHandler):
    def __init__(self):
        # Set the patterns for PatternMatchingEventHandler
        watchdog.events.PatternMatchingEventHandler.__init__(self, patterns=['*.jpg'],
                                                             ignore_directories=True, case_sensitive=False)
  
    def on_created(self, event):
        ### enter your code here and change and save name 
        print("Watchdog received created event - % s." % event.src_path)
        # Event is created, you can process it now
  
    def on_modified(self, event):
        print("Watchdog received modified event - % s." % event.src_path)
        # Event is modified, you can process it now
  
  
if __name__ == "__main__":
    src_path = r'C:\Users\folder\path\for\images'
    event_handler = Handler()
    observer = watchdog.observers.Observer()
    observer.schedule(event_handler, path=src_path, recursive=True)
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()

有关如何使用该库的更多示例，请参阅https://www.geeksforgeeks.org/create-a-watchdog-in-python-to-look-for-filesystem-changes/

Answer 2

使用Watchdog确实可以帮助我在将图像添加到文件夹时立即触发重命名脚本。图像的新名称是从一个不断更新的excel表格中收集的。

date = time.strftime("%Y%m%d")
print(date)

path = r"your path to folder"

#os.chdir()
class OnMyWatch:
    # Set the directory on watch
    watchDirectory = path
  
    def __init__(self):
        self.observer = Observer()
  
    def run(self):
        event_handler = Handler()
        self.observer.schedule(event_handler, self.watchDirectory, recursive = True)
        self.observer.start()
        try:
            while True:
                time.sleep(30)
        except:
            self.observer.stop()
            print("Observer Stopped")
  
        self.observer.join()
  
  
class Handler(FileSystemEventHandler):
  
    
    def on_any_event(self, event):
        if event.is_directory:
            return None
  
        elif event.event_type == 'created':
            # Event is created, you can process it now 
            
            img_folder = os.listdir(path)
            print(path, img_folder)
            img_name = []
            for img in img_folder:
                name, ext = img.split(".")
                img_name.append(name)

            print(img_name)


            time_chunk=[]
            for x in img_name:
                y = x[:11]
                time_chunk.append(y)

            print(time_chunk)


            df = pd.read_excel(r"path to excel file")
            engine_no = df['engine_no'].iloc[-1]
            date_time = str(df['date_time'].iloc[-1])

            print(engine_no)
            print(date_time[:11])


            #old_folder = []
            no = 0
            for i in time_chunk:

                old_path = path +"\\" + img_name[no] + '.jpg'
                print(img_name[no])
                #old_folder.append(old_path)
                new_path = path + "\\" + engine_no + '_' +str(no) + '.jpg'
                print(i)
                no += 1
                if i == date_time[:11]:
                    rename = os.rename(old_path, new_path)
           
#         elif event.event_type == 'modified':
#              return None
                      
if __name__ == '__main__':
    watch = OnMyWatch()
    watch.run()