我不明白为什么我不能将可选参数设置为值。我总是收到一个空清单。我将参数设置为Nonetype以避免在那里存在可变类型。是由于我的父母班级的监督而不更新吗?还是其他吗?
class Human:
def __init__(self,first,last,age,nicknames=None):
self.first =first
self.last = last
self.age = age
if nicknames is None:
self.nicknames = []
else:
self.nicknames = nicknames
class NFL_QB:
def __init__(self,td,comeback,lst=None):
self.td = td
self.comeback = comeback
if lst is None:
self.lst = []
else:
self.lst = lst
class College_QB:
def __init__(self,c_td,c_comeback):
self.c_td = c_td
self.c_comeback = c_comeback
class Player(Human,NFL_QB,College_QB):
def __init__(self,first,last,age,td,comebacks,c_td,c_comebacks,nicknames=None,lst=None):
Human.__init__(self,first,last,age,nicknames=None)
NFL_QB.__init__(self,td,comebacks,lst=None)
College_QB.__init__(self,c_td,c_comebacks)
ply = Player('tom','brady',42,532,55,32,21,['toutchdown tom'],[2016])
将args传递给您的超类构造函数:
class Player(Human,NFL_QB,College_QB):
def __init__(self,first,last,age,td,comebacks,c_td,c_comebacks,nicknames=None,lst=None):
Human.__init__(self,first,last,age,nicknames=nicknames) # You were passing `None` here
NFL_QB.__init__(self,td,comebacks,lst=lst) # ...and here.
College_QB.__init__(self,c_td,c_comebacks)
ply = Player('tom','brady',42,532,55,32,21,['toutchdown tom'],[2016])
print(ply.__dict__)