You Learned About Booleans: True or False?

In this chapter, you learned the following:

• Python uses Boolean values, True and False, to represent what is true and what isn’t. Programs can combine these values using three operators: not, and, and or.

• Boolean operators can also be applied to numeric values. 0, 0.0, the empty string, and None are treated as False; all other numeric values and strings are treated as True. It is best to avoid applying Boolean operators to non-Boolean values.

• Relational operators such as “equals” and “less than” compare values and produce a Boolean result.

• When different operators are combined in an expression, the order of precedence from highest to lowest is arithmetic, relational, and then Boolean.

• if statements control the flow of execution. As with function definitions, the bodies of if statements are indented, as are the bodies of elif and else clauses.

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