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gh-138011: add note about instantiating MyClass with ( ) #138016

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7 changes: 7 additions & 0 deletions Doc/tutorial/classes.rst
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Expand Up @@ -288,6 +288,13 @@ For example (assuming the above class)::
creates a new *instance* of the class and assigns this object to the local
variable ``x``.

.. note::

Be careful to include the parentheses ``()`` when instantiating.
Writing ``x = MyClass`` (without ``()``) will not create an instance,
and calling ``x.f()`` will raise ``TypeError: missing 1 required positional argument: 'self'``.
The correct usage is ``x = MyClass()``.

The instantiation operation ("calling" a class object) creates an empty object.
Many classes like to create objects with instances customized to a specific
initial state. Therefore a class may define a special method named
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