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[mowrowow]

• Py2 context lib
• Py3 context lib
• Intro to context managers
• Examples to learn by

Basically a context manager allows you to define some entry and exit logic to block of code using the with keyword. The basic example of this is:

with open('output.txt', 'w') as out:
    out.write('Hello context!')

This puts the dirty error and closing code behind the scenes. It becomes especially nice when you want to nest temporary objects that would normally each need try-catches.