python program to watch a file - example.

[Wayne R]

I am trying to write a python program that will run as a deamon and
watch a file for data to arrive and then wake up and perform duties on
that data.   I found ways to make a python program run as a deamon but I
am at a loss to find anything related to watching a file for data so
that it can then process the data.  I didn't really want to do a sleep
loop or something like, I am sure there is a better way.
 
Any ideas or links to more info?
 
Wayne
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