By Henning Bassman
ISBN-10: 1850321329
ISBN-13: 9781850321323
Advert Oculos: electronic picture Processing is perfect for computing device technological know-how and electric engineering scholars learning a path in photograph processing. Designed to supply an purposes method of studying the topic, this priceless new textual content is better by way of the award successful software program, advert Oculos (Version 2), a home windows established toolkit that enables the reader to have interaction with, visualise and examine either basic and intricate electronic picture strategies.
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Extra resources for Ad Oculus: Digital Image Processing, Student Version 2.0
Example text
You did not get back a dictionary. The beauty of this decorator is in its simplicity. Apply it to a function, and suddenly a function that did return a Python dictionary, list, or other object now returns its JSON-serialized version. dumps. However, consider the value of having this decorator as the application’s needs expand. For example, what if certain exceptions should be trapped and output specifically formatted JSON, rather than having the exception bubble up and traceback? Because you have a decorator, that functionality is very easy to add.
As with decorators, a key reason to use context managers is to avoid repetitive code. The enter and exit Methods Remember that the with statement’s expression is responsible for returning an object that follows a particular protocol. Specifically, the object must defi ne an __enter__ and an __exit__ method, and the latter method must take particular arguments. The __enter__ method takes no arguments except for the traditional self argument. It is run immediately when the object is returned, and its return value is assigned to the variable used after as, if any (the as clause is technically optional).
Append(func()) The answers list at this point would now contain [3, 5]. This is because the functions are executed in order, and their return values are appended to answers. Several less-trivial uses for function registries exist, such as adding “hooks” into code so that custom functionality can be run before or after critical events. append(func(*args, **kwargs)) return return_values One thing worth noting about this class is that the register method—the decorator—still works the same way as before.
Ad Oculus: Digital Image Processing, Student Version 2.0 by Henning Bassman
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