What is the naming convention for legal identifiers in python

Naming rules for legal identifiers:

1. Identifiers are composed of characters (A~Z and a~z), underscores and numbers, but the first characters cannot be numbers;

2. The identifier cannot be the same as a reserved word in Python;

3. Python identifiers cannot contain special characters such as spaces, @, %, and $ .

Examples of legal identifiers are as follows:

UserID name mode12 user_age

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