import sys


class supresser(object):
    def __init__(self, *types):
        self.types = types
    def __enter__(self):
        pass
    def __exit__(self, *args):
        if args[0] in self.types:
            return True
        else:
            return False

class retyper(object):
    def __init__(self, type_from, type_to):
        self.type_from = type_from
        self.type_to = type_to
    def __enter__(self):
        pass
    def __exit__(self, *args):
        if args[0] == self.type_from:
            exc = self.type_to()
            exc.args = args[1].args
            # print(exc.args == ('lalala', 1))
            raise exc.with_traceback(args[2])

class dumper(object):
    def __init__(self, stream):
        self.stream = stream
    def __enter__(self):
        pass
    def __exit__(self, *args):
        string = repr(args[0].__name__)[1:-1] + ': ' + str(args[1]) + '\n'
        self.stream.write(string)