Python Keywords and Identifiers are essential elements that help in writing code and defining variables, functions, and other constructs. Let’s explore what keywords and identifiers are in Python.
Keywords, also known as reserved words, are predefined and reserved by the Python language. These words have specific meanings and cannot be used as identifiers (variable or function names) because they are part of the language syntax. Here are some examples of Python keywords:
# Example of Python keywords and del from not while as elif global or with assert else if pass yield break except import class in raise continue finally is return def for lambda try
It is important to note that keywords are case-sensitive, meaning that using uppercase or lowercase variations of keywords will result in different meanings. For example,
if is a keyword, but
If are not.
Identifiers are names used to identify variables, functions, classes, modules, and other objects in Python. An identifier can consist of letters (both lowercase and uppercase), digits, and underscores (_). It must start with a letter or an underscore, but it cannot start with a digit. Here are some examples of valid identifiers:
my_variable age myFunction MAX_SIZE
There are a few rules to keep in mind when naming identifiers:
- Identifiers are case-sensitive, so
my_Variableare considered different identifiers.
- Identifiers should be descriptive and follow naming conventions for readability. For example, use lowercase letters and underscores for variable names (
my_variable), and use CamelCase for class names (
- Avoid using reserved words or keywords as identifiers.
Python also has some naming conventions that are commonly followed by the Python community:
- Use lowercase letters and underscores for variable and function names (e.g.,
- Use CamelCase for class names (e.g.,
- Use uppercase letters for constants (e.g.,
Understanding keywords and identifiers in Python is crucial for writing clean and readable code. By choosing meaningful and descriptive identifiers and avoiding reserved words, you can make your code more understandable and maintainable.