The stubs for max() use SupportsLessThanT but should use SupportsGreaterThanT instead.
The CPython source uses Py_GT.
Instrumenting calls to max() shows the '>' operator being invoked:
class I(int):
def __gt__(self, other):
print(f'{self} > {other}')
return int.__gt__(self, other)
def __lt__(self, other):
print(f'{self} < {other}')
return int.__Lt__(self, other)
>>> largest = max(map(I, [10, 40, 20]))
40 > 10
20 > 40
>>> largest
40
A class that supplies only __gt__ suffices for a call to max():
class ReverseInt:
def __init__(self, x):
self.x = x
def __gt__(self, other):
return self.x < other.x
def __repr__(self):
return f'{type(self).__name__}({self.x!r})'
>>> max(map(ReverseInt, [10, 40, 20]))
ReverseInt(10)
The stubs for max() use
SupportsLessThanTbut should useSupportsGreaterThanTinstead.The CPython source uses
Py_GT.Instrumenting calls to max() shows the '>' operator being invoked:
A class that supplies only
__gt__suffices for a call to max():