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A boolean expression is an expression that is either true or false. The following examples use the operator ==, which compares two operands and produces True if they are equal and False otherwise:
>>> 5 == 5 True >>> 5 == 6 False
True and False are special values that belong to the type bool; they are not strings:
>>> type(True) <type 'bool'> >>> type(False) <type 'bool'>
The == perator is one of the comparison operators; the others are:
| x != y | # x is not equal to y |
| x > y | # x is greater than y |
| x < y | # x is less than y |
| x >= y | # x is greater than or equal to y |
| x <= y | # x is less than or equal to y |
| x is y | # x is the same as y |
| x is not y | # x is not the same as y |
Although these operations are probably familiar to you, the Python symbols are different from the mathematical symbols. A common error is to use a single equal sign (=) instead of a double equal sign (==). Remember that = is an assignment operator and == is a comparison operator. There is no such thing as =< or =>.
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