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Practical Maya Programming with Python

You're reading from   Practical Maya Programming with Python Unleash the power of Python in Maya and unlock your creativity

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Product type Paperback
Published in Jul 2014
Publisher
ISBN-13 9781849694728
Length 352 pages
Edition 1st Edition
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Tools
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Author (1):
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Robert Galanakis Robert Galanakis
Author Profile Icon Robert Galanakis
Robert Galanakis
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Table of Contents (12) Chapters Close

Preface 1. Introspecting Maya, Python, and PyMEL FREE CHAPTER 2. Writing Composable Code 3. Dealing with Errors 4. Leveraging Context Managers and Decorators in Maya 5. Building Graphical User Interfaces for Maya 6. Automating Maya from the Outside 7. Taming the Maya API 8. Unleashing the Maya API through Python 9. Becoming a Part of the Python Community A. Python Best Practices Index

Introducing context managers

Context managers are explained in detail in PEP 343: The "with" statement (http://www.python.org/dev/peps/pep-0343/). You shouldn't bother reading it unless you really care about the intricacies of Python itself. In simple terms, it adds the with keyword to Python, so statements like the following are possible:

>>> with open('myfile.txt') as f:
...     text = f.read()

These two lines open a file for reading, and assign the contents of the file to the text variable. It uses the open function as a context manager. It is almost equivalent to these three lines:

>>> f = open('myfile.txt')
>>> text = f.read()
>>> f.close()

This naive code harbors a potential problem. If calling f.read() raises an exception, the file's close method is never called. The file may be opened and locked by Python until the process dies. Ideally, we'd want to make sure the file is closed if an error happens. We...

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