非常感谢大家。在
我实现了我想要的crange（参考@Ni和@J.F.Sebastian）。在import math
class crange:
def __init__(self, start, stop, step=None, modulo=None):
if step == 0:
raise ValueError('crange() arg 3 must not be zero')
if step is None and modulo is None:
self.start = 0
self.stop = start
self.step = 1
self.modulo = stop
else:
self.start = start
self.stop = stop
if modulo is None:
self.step = 1
self.modulo = step
else:
self.step = step
self.modulo = modulo
def __iter__(self):
n = self.start
if n > self.stop:
while n < self.modulo:
yield n
n += 1
n = 0
while n < self.stop:
yield n
n += 1
def __contains__(self, n):
if self.start >= self.stop:
return self.start <= n < self.modulo or 0 <= n < self.stop
else:
return self.start <= n < self.stop
我得到以下输出：
^{pr2}$
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