In Python, a variable is a named location in memory where you can store and access data. Variables are used to store data values that can be used in your program, and they are an essential part of any programming language.
Rules for Declaring Variables in Python
There are a few rules that you need to follow when declaring variables in Python:
- Variable names can only contain letters, numbers, and underscores. They cannot contain spaces or special characters.
- Variable names cannot begin with a number.
- Variable names are case-sensitive, so name and Name are considered to be two different variables.
- Python has a number of reserved words that cannot be used as variable names. These include keywords such as for, while, and def.
Naming Conventions for Variables in Python
There are a few naming conventions that are commonly followed when declaring variables in Python:
- Variable names should be descriptive and meaningful. For example, it’s better to use first_name instead of fn.
- Variable names should be in lowercase, and words should be separated by underscores. For example, first_name is a better variable name than firstName.
- Constants, which are variables that are meant to be unchanging, should be in uppercase and words should be separated by underscores. For example, PI is a good name for a constant that represents the value of Pi.
Declaring Variables in Python
Declaring a variable in Python is simple. All you need to do is give the variable a name and assign it a value using the “=” operator. For example:
1 2 | name = "John" age = 30 |
In this example, we are declaring two variables: name, which is a string, and age, which is an integer.
It’s important to note that in Python, you don’t need to specify the type of a variable when you declare it. The type of a variable is determined by the value you assign to it. For example, if you assign a string value to a variable, it will be treated as a string, and if you assign an integer value to a variable, it will be treated as an integer.
You can use the `type()` function to determine the type of a variable in Python. For example:
1 2 | print(type(name)) # Outputs: <class 'str'> print(type(age)) # Outputs: <class 'int'> |
I hope this tutorial helps you with a basic understanding of how to declare variables in Python! Let me know if you have any questions in the comments.