What are the rules for legal variable names in python?

The rules for legal variable names in python are: 1. It can be composed of letters, numbers, and underscores. At the same time, it cannot start with a number; 2. It cannot be a Python keyword, but it can contain keywords; 3. It cannot Contains spaces. For example: [a1c_x2z].

Python needs to use identifiers to name variables. In fact, identifiers are symbols used to name variables, classes, and methods in the program (identifiers are legal name).

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Python identifier rules are as follows:

• Identifiers can consist of letters and numbers , composed of underscores (_), in which numbers cannot begin.

• Identifiers cannot be Python keywords, but can contain keywords.

• Identifiers cannot contain spaces.

Because Python 3 supports the UTF-8 character set, Python 3 identifiers can use characters in multiple languages ​​that UTF-8 can represent. The Python language is case-sensitive, so abc and Abc are two different identifiers.

Let’s look at some examples:

• abc_xyz: Legal.

• HelloWorld: Legal.

• abc: Legal.

• xyz#abc: Illegal, "#" is not allowed in the identifier.

• abc1: Legal.

• 1abc: Illegal, the identifier does not allow numbers to begin with.

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