In Python, variables are used to store data values. Unlike some other programming languages, Python does not require explicit declaration of variables or their data types. Instead, variables are created when they are first assigned a value. Here are some key points about variables in Python:
Variable Assignment: You assign values to variables using the equals (=) sign.
x = 5
name = "John"
Dynamic Typing: Python is dynamically typed, meaning you don't need to declare the type of a variable. The type of a variable is inferred at runtime based on the value assigned to it.
Variable Naming Rules:
Variable names can contain letters (a-z, A-Z), digits (0-9), and underscores (_).
Variable names cannot start with a digit.
Variable names are case-sensitive (age, Age, and AGE are three different variables).
It's good practice to use descriptive names for variables to make your code more readable.
Data Types: Variables in Python can hold values of different data types, including:
Integers (int): Whole numbers, e.g., 5, 100, -10.
Floating-point numbers (float): Real numbers with a decimal point, e.g., 3.14, 2.71828.
Strings (str): Ordered sequences of characters enclosed in single (') or double (") quotes, e.g., "Hello", 'Python'.
Booleans (bool): Represents either True or False.
Lists, tuples, dictionaries, sets, etc. (complex data types).
Reassigning Variables: You can change the value of a variable by assigning it a new value.
x = 5
x = x + 1 # Now x holds the value 6
Multiple Assignment: You can assign multiple variables in a single line.
a, b, c = 1, 2, 3
Global and Local Variables: Variables defined outside of any function are considered global, while variables defined inside a function are local to that function.
Deleting Variables: You can delete a variable using the del statement.
x = 5
del x
Variables are fundamental to programming in Python, and understanding how to work with them effectively is essential for writing Python code.
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