pylint error when using metaclass

let g: syntastic_python_python_exec = '/path/to/python3'

# This is a placeholder
for correct code
for this message.

#!/usr/bin/env python3 class MyMeta(type):     pass class MyObject(object, metaclass=MyMeta): # pylint error here     pass

let g: syntastic_python_python_exec = '/path/to/python3'

from abc
import ABC

class MyABC(ABC):
   pass

from abc
import ABCMeta

class MyABC(metaclass = ABCMeta):
   pass

from abc
import ABC

class MyABC(ABC):
   pass

MyABC.register(tuple)

assert issubclass(tuple, MyABC)
assert isinstance((), MyABC)

class Foo:
   def __getitem__(self, index):
   ...
   def __len__(self):
   ...
   def get_iterator(self):
   return iter(self)

class MyIterable(ABC):

   @abstractmethod
def __iter__(self):
   while False:
   yield None

def get_iterator(self):
   return self.__iter__()

@classmethod
def __subclasshook__(cls, C):
   if cls is MyIterable:
   if any("__iter__" in B.__dict__
      for B in C.__mro__):
   return True
return NotImplemented

MyIterable.register(Foo)

class C(ABC):
   @abstractmethod
def my_abstract_method(self, arg1):
   ...
   @classmethod
@abstractmethod
def my_abstract_classmethod(cls, arg2):
   ...
   @staticmethod
@abstractmethod
def my_abstract_staticmethod(arg3):
   ...

   @property
@abstractmethod
def my_abstract_property(self):
   ...
   @my_abstract_property.setter
@abstractmethod
def my_abstract_property(self, val):
   ...

   @abstractmethod
def _get_x(self):
   ...
   @abstractmethod
def _set_x(self, val):
   ...
   x = property(_get_x, _set_x)

class Descriptor:
   ...
   @property
def __isabstractmethod__(self):
   return any(getattr(f, '__isabstractmethod__', False) for f in (self._fget, self._fset, self._fdel))

class M(type):
   pass

class A(metaclass = M):
   pass

class A(object):
   __metaclass__ = M

import six

class A(six.with_metaclass(M)):
   pass

@six.add_metaclass(M)
class C(object):
   pass

from typing
import Type, TypeVar, ClassVar
T = TypeVar('T')

class M(type):
   count: ClassVar[int] = 0

def make(cls: Type[T]) - > T:
   M.count += 1
return cls()

class A(metaclass = M):
   pass

a: A = A.make() # make() is looked up at M;
the result is an object of type A
print(A.count)

class B(A):
   pass

b: B = B.make() # metaclasses are inherited
print(B.count + " objects were created") # Error: Unsupported operand types
for +("int"
   and "str")

class M1(type): pass
class M2(type): pass

class A1(metaclass = M1): pass
class A2(metaclass = M2): pass

class B1(A1, metaclass = M2): pass # Mypy Error: Inconsistent metaclass structure
for "B1"
# At runtime the above definition raises an exception
# TypeError: metaclass conflict: the metaclass of a derived class must be a(non - strict) subclass of the metaclasses of all its bases

# Same runtime error as in B1, but mypy does not
catch it yet
class B12(A1, A2): pass

Type of number is: <class 'int'>
   Type of list is: <class 'list'>
      Type of name is: <class 'str'>

Type of City_object is: <class '__main__.City'>

Type of City class is: <class 'type'>

65
Pune

The Type of City class: <class 'type'>
   The Type of City_object: <class '__main__.City'>
      This is a inherited method!
      This is City class method!
      Mark Jackson

---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-2-409c90c285d5> in <module>
      29 pass
      30 # This will raise an error!
      ---> 31 class S(P, Q, R):
      32 pass

      <ipython-input-2-409c90c285d5> in __new__(city, city_name, bases, citydict)
         6 # it will raise an error
         7 if len(bases)>1:
         ----> 8 raise TypeError("There are inherited multiple base classes!!!")
         9
         10 # else it will execute the __new__() function of super class, that is

         TypeError: There are inherited multiple base classes!!!

$ python3 - m pip install plerr
$ plerr r1710

$ python3 - m pip install pipx #
if not yet installed pipx
$ python3 - m pipx ensurepath # ensure directory where pipx stores apps is on PATH
$ pipx install plerr
$ plerr r1710

$ git clone https: //github.com/vald-phoenix/pylint-errors.git
   $ sudo apt update && sudo apt install - y python3 - pip #
if not yet installed
$ cd pylint - errors
$ python3 setup.py test
$ python3 setup.py install--user
$ python3 - m plerr r1710

$ git clone https: //github.com/vald-phoenix/pylint-errors.git
   $ sudo apt install - y make python3 - pip python3 - venv #
if not yet installed
$ cd pylint - errors
$ python3 - m pip install pipx wheel # install a package to build a wheel and pipx
$ python3 - m pipx ensurepath # ensure directory where pipx stores apps is on PATH
$ python3 setup.py test # run tests
$ make clean
$ python3 setup.py bdist_wheel # build a binary wheel
$ pipx install dist
/* # install a binary wheel by pipx
$ plerr r1710