Conditional Expressions: Concise One-Liner Implementation of if-else in Python

The Python conditional expression (ternary operator) is used to simplify "either/or" logic. Its syntax is "expression1 if condition else expression2", where expression1 is returned if the condition is true, otherwise expression2 is returned. For example, in score judgment: `result = "及格" if score >=60 else "不及格"`. It is suitable for simple either/or scenarios, and nesting can implement multi-conditions (≤2-3 levels), improving code conciseness and readability. Note: It can only be used for returning values and must not contain statements such as assignments; avoid excessive nesting, and for complex logic (multi-level conditions), the traditional `if-elif-else` is recommended; parentheses should be used to clarify operator precedence. In summary, use conditional expressions for simple logic and traditional structures for complex scenarios, balancing conciseness and readability.