This attribute will use for convertion classes to other types, i.e. 
int(MyClass) will return __convert__ result in MyClass

Example:
class MyClass:
   def __init__(self, numer: int):
      self.number = number
   def __convert__(self, type):
      assert type == int # Only integer is allowed
      return self.number*5 # Example

test = MyClass(1)
test_2 = MyClass(5)

print( int(test) ) # 5
print( int(test2) ) # 25
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