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Learn Python 3: Comprehensive Programming Guide

Compound Conditions

Explore how to use compound conditions in Python to combine multiple boolean expressions with logical operators like and, or, and not. Understand short-circuit evaluation, operator precedence, and grouping to write clear, robust conditional statements that model complex real-world decisions accurately.

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Real-world decisions rarely hinge on a single factor. We don't just ask, "Is the store open?" We ask, "Is the store open AND do I have my wallet?" or "Is it the weekend OR do I have a day off?" To write programs that model this reality, we need more than simple comparisons. We need to fuse multiple conditions into precise logical rules. By mastering compound conditions, we can express complex requirements in a single, readable line of code, ensuring our programs handle nuance as effectively as they handle basic facts.

Combining checks with and and or

We often need to check more than one condition before executing a block of code. Python provides the logical operators and and or to combine boolean expressions.

  • The and operator requires both conditions to be True. If even one condition is False, the entire expression fails. This is used for strict requirements where every rule must be met.

  • The or operator requires only one condition to be True. The expression succeeds if the first condition is met, the second is met, or both are met. This is used ...