Why doesn’t 2.__add__(3) work in Python?

  • dunder
  • float
  • integer

Python parses 2. as the float 2.0, this can cause troubles when trying to use methods on integers.

>>> 2.__add__(3)
  File "<stdin>", line 1
    2.__add__(3)
        ^
SyntaxError: invalid syntax
>>> (2).__add__(3)
5