Convert string to path using Python 2.7

[tester_V]

	
filestat = os.stat(np)

It works but How I can use it ?
It produces an error if I use filestat instead if np in "IF"
Error:

if yesterday == dt.datetime.fromtimestamp(filestat.stat().st_mtime).date():
AttributeError: 'os.stat_result' object has no attribute 'stat'

I wish I could install Python 3.x on the PCs, but they are not under my control...