(self, env=None, invalidate_memoization=False)
return
The flag ``invalidate_memoization`` can be used to clear the cache
        after the walk has been completed: the cache is one-time use.
The flag ``invalidate_memoization`` can be used to clear the cache
        after the walk has been completed: the cache is one-time use.
The flag invalidate_memoization can be used to clear the cache after the walk has been completed : the cache is one - time use .
def __init__(self, env=None, invalidate_memoization=False):
        """The flag ``invalidate_memoization`` can be used to clear the cache
        after the walk has been completed: the cache is one-time use.
        """
        Walker.__init__(self, env)

        self.memoization = {}
        self.invalidate_memoization = invalidate_memoization
        self.stack = []
        return
def __init__ ( self , env = None , invalidate_memoization = False ) : Walker . __init__ ( self , env ) self . memoization = { } self . invalidate_memoization = invalidate_memoization self . stack = [ ] return