Hi,
TypeError: 'NoneType' object is not callable? Why this error and what is the
solution?
Code:
class SuperMeta:
def __call__(self, classname, supers, classdict):
print('In SuperMeta.call: ', classname, supers, classdict, sep='\n...')
Class = self.__New__(classname, supers, classdict)
self.__Init__(Class, classname, supers, classdict)
class SubMeta(SuperMeta):
def __New__(self, classname, supers, classdict):
print('In SubMeta.new: ', classname, supers, classdict, sep='\n...')
return type(classname, supers, classdict)
def __Init__(self, Class, classname, supers, classdict):
print('In SubMeta init:', classname, supers, classdict, sep='\n...')
print('...init class object:', list(Class.__dict__.keys()))
class Eggs:
pass
print('making class')
class Spam(Eggs, metaclass=SubMeta()):
data = 1
def meth(self, arg):
pass
print('making instance')
X = Spam()
print('data:', X.data)
Output:
making class
In SuperMeta.call:
...Spam
...(<class '__main__.Eggs'>,)
...{'meth': <function Spam.meth at 0x0000000003539EA0>, '__module__':
'__main__', '__qualname__': 'Spam', 'data': 1}
In SubMeta.new:
...Spam
...(<class '__main__.Eggs'>,)
...{'meth': <function Spam.meth at 0x0000000003539EA0>, '__module__':
'__main__', '__qualname__': 'Spam', 'data': 1}
In SubMeta init:
...Spam
...(<class '__main__.Eggs'>,)
...{'meth': <function Spam.meth at 0x0000000003539EA0>, '__module__':
'__main__', '__qualname__': 'Spam', 'data': 1}
...init class object: ['meth', '__module__', 'data', '__doc__']
making instance
Traceback (most recent call last):
File "C:/Users/Satish/Desktop/Python/Metaclasses7.py", line 21, in <module>
X = Spam()
TypeError: 'NoneType' object is not callable
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