August 2018
Intermediate to advanced
248 pages
5h 51m
English
Content preview from Mastering Python Design Patterns - Second Edition
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Real-world examples
Chip (also known as Chip and PIN) cards (j.mp/wichpin) offer a good example of how a protective proxy is used in real life. The debit/credit card contains a chip that first needs to be read by the ATM or card reader. After the chip is verified, a password (PIN) is required to complete the transaction. This means that you cannot make any transactions without physically presenting the card and knowing the PIN.
A bank check that is used instead of cash to make purchases and deals is an example of a remote proxy. The check gives access to a bank account.
In software, the weakref module of Python contains a proxy() method that accepts an input object and returns a smart proxy to it. Weak references are the recommended way to ...
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