class pStream:
###PRIVATE FUNCTIONS

    def _builder(self, expression):
        self.STR = expression
        return self


###OVERRIDES
    def next(self):
        return next(self.STR)

    def __init__(self, iterable_thing):
        self.STR = iterable_thing

    def __iter__(self):
        return iter(self.STR)

### TRANSFORMS
    def map(self,function):
        return self._builder(map(function, self.STR))

### CONSUMERS

    def print_stream(self):
        print(list(self.STR))

    def consume(self, function):
        function(self.STR)

    def drain(self):
        for x in self.STR:
            pass


Add basic class structure, map functionality, and a set of consumer functions.