• 1. If else statement if else: 语句

• 1.If none of the conditions are true, it will execute the "else" action, if one is present, and then continue executing lines following the entire "if, elif, else" statement.
  如果没有条件为真，则将执行“ else ”操作，如果有一个条件为真，则继续执行整个“ if, elif, else ”语句之后的行。
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