class Echo():
def __init__(self, name):
self.name = name
print("Hello {}!".format(name))
def __len__(self):
n=0
name=self.name
for i in name:
if i.isupper()==True:
n=n+1;
print("Hello {}!".format(n))
s = input()
echoA = Echo(s)
len(echoA)I would like to ask you why you reported this mistake "NoneType" object cannot be interpreted as an integer
. when defining the magic method def _ _ len__ (self) , you need to return a value, that is, _ _ len__ () should return > = 0 . No, no, no. The return statement is not shown here, so None
python.org/3/reference/datamodel.html?highlight=__len__-sharpobject.__len__" rel=" nofollow noreferrer "> _ _ len__: official document
the method must have a return value, and the return value is integer > = 0.
>>> class Echo():
... def __init__(self, name):
... self.name = name
... print("Hello {}!".format(name))
... def __len__(self):
... n=0
... name=self.name
... for i in name:
... if i.isupper()==True:
... n=n+1;
... return n
...
>>> s = input()
WWW.OS373.CN
>>> echoA = Echo(s)
Hello WWW.OS373.CN!
>>> len(echoA)
7dict1 = { "system.cpu.user.pct": { "value": 12.83 }, "system.load.1": { "value": 0.33 } } dict2 = { "system": { "...
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