context_manager.py

class ExecutableTempFile:
    def __init__(self, someFile):
        self.theFile= someFile
    def __enter__(self):
        self.transLog= SecureLog( self.theFile )
        return self.transLog
    def __exit__( self, type, value, tb ):
        if type is not None:
            pass # Exception occurred
        self.transLog.finalize()
        self.transLog.close()
        self.theFile.close()
        
contents = "foobar"
with ExecutableTempFile(contents) as path:
  subprocess.check_call("sh " + path)