What are Variables in Python
Variables in Python allows us to store a data by assigning it to a name. Variables are used to hold values that can be referenced and manipulated in a program. Python is dynamically typed, meaning you don’t need to specify a variable’s data type when declaring.
To declare a Variables in Python, you simply assign a value to a name using the equals sign =. Here is an example:
Example
name = "John" age = 20
In an above example, the variable name is assigned a string value of "John" and the variable age is assigned an integer value of 20.
Types of Variables in Python
In Python, there are several types of variables that we can use to store and manipulate data. Here are some of the most common types of variables in Python:
- Integers: Integers are whole numbers (positive, negative, or zero) without any decimal point. For example
3,7,87,-98. - Floats: Floats are numbers with a decimal point or fractional component. For example 3.14, 45.76.
- Strings: Strings are sequences of characters enclosed in quotes. They can contain letters, numbers, symbols, and spaces. For example “Hello”, ” “, “Water321”.
- Lists: Lists are ordered collections of items enclosed in square brackets, and can contain any type of variable. For example [“Hello”, “laptop”, “123”].
- Tuples: Tuples are similar to lists, but are immutable (cannot be changed once created) and enclosed in parentheses. For example (“Hello”, “Apple”, 37, True)
- Dictionaries: Dictionaries are unordered collections of key-value pairs enclosed in curly braces, where each key is associated with a value. For example {“Name”: “John”, “Age”: 26, “Gender”: “Male”}.
- Sets: Sets are unordered collections of unique items enclosed in curly braces, and can contain any type of variable. For example {“hello”, “mango”, “Football”}.
Rules for Python Variable Names
Variable names in Python can only include letters, digits, and underscores, but cannot begin with a digit. Variable names must not include any special character like %, $ etc. Since Variable names are case sensitive, so age and Age are different variables.
Assign Multiple Values
Python supports multiple assignment, which allows you to assign values to multiple variables at once. For Example:
x, y, z = 1, 2, 3 print (x) #Outputs: 1 print (y) #Outputs: 2 print (z) #Outputs: 3
Python also allows us to assign the same value to multiple variales. For Example:
x, y, z = "Mango" print (x) #Outputs: Mango print (y) #Outputs: Mango print (z) #Outputs: Mango
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