Python 如何“监视”文件以进行修改/更改？
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How can I "watch" a file for modification / change?
提问by meder omuraliev
I would like to invoke my chromeor firefoxbrowser when a file that I specify is modified. How could I "watch" that file to do something when it gets modified?
当我指定的文件被修改时，我想调用我的chrome或firefox浏览器。当它被修改时，我怎么能“观察”该文件以执行某些操作？
Programmatically it seems the steps are.. basically set a never ending interval every second or so and cache the initial modification date, then compare the date every second, when it changes invoke X.
从编程上看，这些步骤似乎是......基本上每秒设置一个永无止境的间隔并缓存初始修改日期，然后每秒比较日期，当它更改调用 X 时。
采纳答案by Matthew Flaschen
As noted, you can use pyinotify:
如前所述，您可以使用pyinotify：
E.g.:
例如：
import webbrowser
import pyinotify
class ModHandler(pyinotify.ProcessEvent):
# evt has useful properties, including pathname
def process_IN_CLOSE_WRITE(self, evt):
webbrowser.open(URL)
handler = ModHandler()
wm = pyinotify.WatchManager()
notifier = pyinotify.Notifier(wm, handler)
wdd = wm.add_watch(FILE, pyinotify.IN_CLOSE_WRITE)
notifier.loop()
This is more efficient than polling. The kernel tells you when it does the operation, without you having to constantly ask.
这比轮询更有效。内核会在执行操作时告诉您，而无需您不断询问。
回答by Sam Dolan
回答by gtrak
use a quick hash function, a cron job, and off you go!
使用快速散列函数、cron 作业，然后就可以了！
Also, this looks relevant: http://en.wikipedia.org/wiki/Inotify
此外，这看起来很相关：http: //en.wikipedia.org/wiki/Inotify
回答by Dr. Snoopy
回答by nwmcsween
Install inotify-tools and write a simple shell script to watch a file.
安装 inotify-tools 并编写一个简单的 shell 脚本来监视文件。
回答by jamescampbell
Apparently, watchdogworks on both Linux & OSX that can be used to monitor for changes in a directory as well with great example documentation. It also works with python3.x in case you don't want to be forced to use python2.x
显然，看门狗适用于 Linux 和 OSX，可用于监视目录中的更改以及很好的示例文档。如果您不想被迫使用 python2.x，它也适用于 python3.x
