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This article mainly explains "what is the selection structure in python". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what is the choice structure in python"?

According to the algorithm theory, the three basic structures of the program are sequence structure, selection structure and loop structure. Any program structure can be obtained through the combination of these three basic structures. Any algorithm can be expressed by these three basic structures.

The sequential structure executes a set of operation instructions in turn.

The selection structure is to execute different groups of operation instructions according to different conditions.

The loop structure means that a set of operation instructions are repeated several times under certain conditions.

Let's introduce some ways to implement the selection structure in Python.

One, if statement

Second, dictionary query

Python does not have keywords like the C language switch. If you want to implement a multi-branch selection structure, you can use the following methods.

Third, short circuit calculation and forced type conversion

Python and, or, are not represented by the keywords and, or, and not, respectively.

[], {}, set () will be treated as False.

For and, Python evaluates the Operand from left to right and returns the first Operand that is false.

For or, Python evaluates the Operand from left to right and returns the first Operand that is true.

After the first Operand that is false or true is found, the Operand is no longer calculated.

This property of and and or logic operations is called short-circuit computation.

Four, try...except... Statement

Try...except... is commonly used in python Statement to handle possible errors.

It is also a kind of choice structure in essence.

Fifth, thinking practice

13, implement the following multi-branch selection structure in a variety of ways. It is recommended to try if statement, short circuit calculation, and forced type conversion. (reply keyword python13 for reference answer)

14, using try...except... Statement to handle possible errors.

(reply keyword python14 for reference answer)

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