<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def apply(self, parent_environ=None):
 """Apply the context to the current python session. Note that this updates os.environ and possibly sys.path, if `parent_environ` is not provided. Args: parent_environ: Environment to interpret the context within, defaults to os.environ if None. """

        interpreter = Python(target_environ=os.environ)
        executor = self._create_executor(interpreter, parent_environ)
        self._execute(executor)
        interpreter.apply_environ()