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The integer 2 has an __add__ method:
>>> "__add__" in dir(2)
True
... but calling it raises a SyntaxError:
>>> 2.__add__(3)
File "<stdin>", line 1
2.__add__(3)
^
SyntaxError: invalid syntax
Why can't I use the __add__ method?
315
The __add__() method in Python specifies what happens when you call + on two objects. When you call obj1 + obj2, you are essentially calling obj1.
Python does not support function overloading. When we define multiple functions with the same name, the later one always overrides the prior and thus, in the namespace, there will always be a single entry against each function name.
The __int__ method is called to implement the built-in int function. The __index__ method implements type conversion to an int when the object is used in a slice expression and the built-in hex , oct , and bin functions.
Python's object. __sub__(self, other) method returns a new object that represents the difference of two objects. It implements the subtraction operator - in Python.
2. is parsed as a float, so 2.__add__ is a SyntaxError.
You can evaluate
(2).__add__(3) instead.
In [254]: (2).__add__(3)
Out[254]: 5
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