from functools import lru_cache
from zlib import adler32 as _HashFunc
HashFunc = lambda v: hex( _HashFunc( v ) )[2:]


@lru_cache( maxsize = 1024 )
def checksum( file_path ):
	try:
		with open( file_path, "rb" ) as f:
			return HashFunc( f.read() )
	except FileNotFoundError:
		return HashFunc( b"" )