cpp-style-increment-counter.py

"""
Python-ANTIPATTERN counter
"""
class Counter(object):
    def __init__(self, init=0):
        self.val = init

    def __repr__(self):
        return 'Count: {}'.format(self.val)

    def __neg__(self):
        self.val -= 1
        return self

    def __pos__(self, *args):
        self.val += 1
        return self

    def __add__(self, other):
        self.val += int(other)
        return self

    def __radd__(self, other):
        return self.__add__(other)

    def __sub__(self, other):
        self.val += int(other)
        return self

    def __rsub__(self, other):
        return self.__sub__(other)

c = Counter()
print(c)
# Count: 0
+c
print(c)
# Count: 1
+++c
print(c)
# Count: 4
c += 3
print(c)
# Count: 7
--c
print(c)
# Count: 5
c += 2
# Count: 7
c += -2
# Count: 5