diff --git a/Doc/faq/design.rst b/Doc/faq/design.rst index 300e1b6cc40a58..c8beb64e39bc1a 100644 --- a/Doc/faq/design.rst +++ b/Doc/faq/design.rst @@ -259,9 +259,11 @@ is evaluated in all cases. Why isn't there a switch or case statement in Python? ----------------------------------------------------- -You can do this easily enough with a sequence of ``if... elif... elif... else``. -For literal values, or constants within a namespace, you can also use a -``match ... case`` statement. +In general, structured switch statements execute one block of code +when an expression has a particular value or set of values. +Since Python 3.10 one can easily match literal values, or constants +within a namespace, with a ``match ... case`` statement. +An older alternative is a sequence of ``if... elif... elif... else``. For cases where you need to choose from a very large number of possibilities, you can create a dictionary mapping case values to functions to call. For @@ -290,6 +292,9 @@ It's suggested that you use a prefix for the method names, such as ``visit_`` in this example. Without such a prefix, if values are coming from an untrusted source, an attacker would be able to call any method on your object. +Imitating switch with fallthrough, as with C's switch-case-default, +is possible, much harder, and less needed. + Can't you emulate threads in the interpreter instead of relying on an OS-specific thread implementation? -------------------------------------------------------------------------------------------------------- pFad - Phonifier reborn

Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.

Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.


Alternative Proxies:

Alternative Proxy

pFad Proxy

pFad v3 Proxy

pFad v4 Proxy