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It used to very common to see Python code that declared TRUE and FALSE to be 1 and 0, respectively, at the top of every file. Or, it might have been True and False or true and false. Now we know Guido's preferred capitalization: True and False have been added as constants. Numerically, they still behave as 0 and 1, but we won't have to declare them anymore.

The built-in function bool() can be used to convert anything that can be tested for truth into a Boolean.

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