Python variable naming rules
In Python, variables are used to store data, and variable naming is for us to understand and refer to these data. Python's variable naming rules are relatively flexible, but there are also some basic rules and conventions, let us understand them together.
basic rules
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Can only contain letters, numbers, and underscores : Variable names can only consist of letters (upper and lower case), numbers, and underscores, and cannot contain spaces and other special characters.
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Cannot start with a number : Variable names cannot start with a number, but can be followed by a letter or underscore.
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Case sensitivity : Python is a case-sensitive language, so upper and lower case letters in variable names are treated as different characters.
naming convention
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Use meaningful names : Variable names should clearly reflect the purpose of the variable, making it easy to understand at a glance.
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Use lowercase letters : Usually, variable names are in lowercase letters, which helps to improve the readability of the code. If the variable name consists of multiple words, they can be separated by underscores, for example:
user_name. -
Avoid using reserved words : Python has some reserved words used to represent specific grammatical structures and keywords, such as
if,while,foretc., do not use them as variable names.
for example
Create a variable to hold the user's age. Give the variable a name user_age. In this way, it is clear that this variable is used to store the age information of the user.
Use a variable to represent the number of visits to the website. Choose a meaningful variable name website_visitsthat clearly expresses the purpose of the variable. This way, not only can the code be easily understood, but others can quickly understand what the variables mean.
Python's variable naming rules are very flexible, but for the readability and maintainability of the code, we should follow the basic naming rules and conventions. By meaningful and standardized variable naming, we are better able to write clear and understandable Python code.
