最简单的解决方案是在间隔之后获取同一个文件的两个实例并进行比较。你可以试试这样的东西

    while True:
        # Capturing the two instances models.py after certain interval of time
        print("Looking for changes in " + app_name.capitalize() + " models.py\nPress 'CTRL + C' to stop the program")
        with open(app_name.capitalize() + '/filename', 'r+') as app_models_file:
            filename_content = app_models_file.read()
        time.sleep(5)
        with open(app_name.capitalize() + '/filename', 'r+') as app_models_file_1:
            filename_content_1 = app_models_file_1.read()
        # Comparing models.py after certain interval of time
        if filename_content == filename_content_1:
            pass
        else:
            print("You made a change in " + app_name.capitalize() + " filename.\n")
            cmd = str(input("Do something with the file?(y/n):"))
            if cmd == 'y':
                # Do Something
            elif cmd == 'n':
                # pass or do something
            else:
                print("Invalid input")

在对蒂姆·戈尔登的剧本进行了一些修改后，我有了以下似乎工作得相当不错的内容:

import os

import win32file
import win32con

path_to_watch = "." # look at the current directory
file_to_watch = "test.txt" # look for changes to a file called test.txt

def ProcessNewData( newData ):
    print "Text added: %s"%newData

# Set up the bits we'll need for output
ACTIONS = {
  1 : "Created",
  2 : "Deleted",
  3 : "Updated",
  4 : "Renamed from something",
  5 : "Renamed to something"
}
FILE_LIST_DIRECTORY = 0x0001
hDir = win32file.CreateFile (
  path_to_watch,
  FILE_LIST_DIRECTORY,
  win32con.FILE_SHARE_READ | win32con.FILE_SHARE_WRITE,
  None,
  win32con.OPEN_EXISTING,
  win32con.FILE_FLAG_BACKUP_SEMANTICS,
  None
)

# Open the file we're interested in
a = open(file_to_watch, "r")

# Throw away any exising log data
a.read()

# Wait for new data and call ProcessNewData for each new chunk that's written
while 1:
  # Wait for a change to occur
  results = win32file.ReadDirectoryChangesW (
    hDir,
    1024,
    False,
    win32con.FILE_NOTIFY_CHANGE_LAST_WRITE,
    None,
    None
  )

  # For each change, check to see if it's updating the file we're interested in
  for action, file in results:
    full_filename = os.path.join (path_to_watch, file)
    #print file, ACTIONS.get (action, "Unknown")
    if file == file_to_watch:
        newText = a.read()
        if newText != "":
            ProcessNewData( newText )

它可能需要进行更多的错误检查，但对于简单地观察日志文件并在将其输出到屏幕之前对其进行一些处理，这样做效果很好。

谢谢大家的投入-很棒的东西!

最好和最简单的解决方案是使用pygtail: https://pypi.python.org/pypi/pygtail

from pygtail import Pygtail
import sys

while True:
    for line in Pygtail("some.log"):
        sys.stdout.write(line)

watchfiles (https://github.com/samuelcolvin/watchfiles)是一个Python API和CLI，它使用了用Rust编写的Notify (https://github.com/notify-rs/notify)库。

rust实现目前(2022-10-09)支持:

Linux / Android: inotify macOS: FSEvents或kqueue，参见特性 Windows: ReadDirectoryChangesW FreeBSD / NetBSD / OpenBSD / DragonflyBSD: kqueue 所有平台:投票

可以在PyPI (https://pypi.org/project/watchfiles/)和conda-forge (https://github.com/conda-forge/watchfiles-feedstock)上获得二进制文件。

这是一个检查文件更改的示例。这可能不是最好的方法，但肯定是一条捷径。

方便的工具，重新启动应用程序时，已作出更改的源。我在玩pygame的时候做了这个，这样我就可以看到文件保存后立即发生的效果。

当在pygame中使用时，确保'while'循环中的东西被放置在你的游戏循环中，也就是更新或其他什么。否则你的应用将陷入无限循环，你将看不到游戏的更新。

file_size_stored = os.stat('neuron.py').st_size

  while True:
    try:
      file_size_current = os.stat('neuron.py').st_size
      if file_size_stored != file_size_current:
        restart_program()
    except: 
      pass

如果你想要重启代码我在网上找到的。在这儿。(与问题无关，但可能会派上用场)

def restart_program(): #restart application
    python = sys.executable
    os.execl(python, python, * sys.argv)

让电子做你想让它们做的事情。

看看我对类似问题的回答。您可以在Python中尝试相同的循环。本页建议:

import time

while 1:
    where = file.tell()
    line = file.readline()
    if not line:
        time.sleep(1)
        file.seek(where)
    else:
        print line, # already has newline

还可以使用Python查看文件中的问题tail()。