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Learning Cython Programming (Second Edition)

You're reading from   Learning Cython Programming (Second Edition) Expand your existing legacy applications in C using Python

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Product type Paperback
Published in Feb 2016
Publisher Packt
ISBN-13 9781783551675
Length 110 pages
Edition 2nd Edition
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Author (1):
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Philip Herron Philip Herron
Author Profile Icon Philip Herron
Philip Herron
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Toc

Preventing subclassing


If you create an extension type in Cython, something you never want to be subclassed, it is a cpp class wrapped in a Python class. To prevent this, you can do the following:

cimport cython

@cython.final
cdef class A: pass

cdef class B (A): pass

This annotation will give an error when someone tries to subclass:

pycode.pyx:7:5: Base class 'A' of type 'B' is final

Note that these annotations only work on the cdef or cpdef functions and not on normal Python def functions.

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