Python variables
Variables in Python
In Python, variables are used to store values and are declared by assigning a value to a name. The value can be of any data type, such as a number, string, list, or object. Here's an example of how to declare a variable in Python:
x = 5 # declares a variable x and assigns it the value of 5
name = "John" # declares a variable name and assigns it the value of "John"
fruits = ["apple", "banana", "orange"] # declares a variable fruits and assigns it the value of a list
You can also assign a value to a variable after it has been declared:
x = 5
x = 10 # x now has the value of 10
Variable names in Python can contain letters, numbers, and underscores, but cannot start with a number. Python is case-sensitive, so x and X are considered to be different variables.
It's a good practice to give variables descriptive and meaningful names, so that it will be easy to understand the code later. Also, it's a good idea to follow conventions such as using lowercase letters and separating words with underscores.
Python also have a number of conventions for naming variables, such as:
- Variables should be lowercase
- Words in the variable name should be separated by underscores
- Avoid using Python keywords and built-in function names as variable names
It's also important to note that variables in Python are not explicitly declared with a specific data type, unlike some other programming languages. Instead, the data type of a variable is determined at runtime based on the value that is assigned to it. This is one of the key characteristics of Python being a dynamically-typed language.
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