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Functional Python Programming - Second Edition
book

Functional Python Programming - Second Edition

by Steven F. Lott
April 2018
Intermediate to advanced content levelIntermediate to advanced
408 pages
10h 42m
English
Packt Publishing
Content preview from Functional Python Programming - Second Edition

Using the functools update_wrapper() functions

The @wraps decorator applies the update_wrapper() function to preserve a few attributes of a wrapped function. In general, this does everything we need by default. This function copies a specific list of attributes from the original function to the resulting function created by a decorator. What's the specific list of attributes? It's defined by a module global.

The update_wrapper() function relies on a module global variable to determine what attributes to preserve. The WRAPPER_ASSIGNMENTS variable defines the attributes that are copied by default. The default value is this list of attributes to copy:

('__module__', '__name__', '__qualname__', '__doc__',  '__annotations__')

It's difficult to ...

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Functional Python Programming - Third Edition

Functional Python Programming - Third Edition

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Publisher Resources

ISBN: 9781788627061Supplemental Content