Stop loop in Python when a file has been modified -

i've filename myfile.txt , want simple script tells me when file has been modified. i'm using os.stat(file).st_mtime see if has been modified. if time has changed, file has been modified.

how can use os.stat(file).st_mtime in while loop this?

while file hasnt been modified:      print "file not modified" print "the file has been modified" 

thanks in advance.

something like

mtime = os.stat(file).st_mtime while os.stat(file).st_mtime == mtime:    print "file not modified" print "the file has been modified"