Case Analysis of selective structure in Python

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1. The selection structure determines the execution of the branch by judging whether the condition is established or not.

2. Choose the structural form: single branch, double branch and multi-branch.

3. Multi-branch structure, there is a logical relationship between several branches, and the order can not be reversed at will.

Example

'' single branch selection structure if conditional expression: sentence / statement block''if 3 branch selection structure if conditional expression: statement / statement block else statement / statement block''a = 3 if a