max() works with greater-than or less-than #6575
Description
Currently max() expects __gt__, but this example indicates that it also works if only __lt__ is present:
class Lt:
def __init__(self, x):
self.x = x
def __repr__(self):
return f"Lt({self.x})"
def __lt__(self, other):
return self.x < other.x
class Gt:
def __init__(self, x):
self.x = x
def __repr__(self):
return f"Gt({self.x})"
def __gt__(self, other):
return self.x > other.x
print(max(Lt(2), Lt(5))) # Lt(5)
print(max(Lt(5), Lt(2))) # Lt(5)
print(max(Gt(2), Gt(5))) # Gt(5)
print(max(Gt(5), Gt(2))) # Gt(5)I think that we should accept either method.
The signature of max() was changed to expect __gt__ in #6342.