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How do you use multiple context managers at once?

Q: How do you use multiple context managers at once?

Use a single `with` with commas or parentheses: `with open('a') as a, open('b') as b:`. Both are entered and guaranteed to be cleaned up (in reverse order) even if an exception occurs. `contextlib.ExitStack` handles a dynamic number.

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Use a single with with commas or parentheses: with open('a') as a, open('b') as b:. Both are entered and guaranteed to be cleaned up (in reverse order) even if an exception occurs. contextlib.ExitStack handles a dynamic number.

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