Python Variables and Data Types - Important Points
Python Variables and Data Types - MCQ
In Python, a variable is a name that is used to refer to a value stored in the computer's memory. Variables are used to store data and are an important concept in programming. Understanding variables and data types is essential for beginners learning Python.
Python has several built-in data types that can be used to store different types of values. Some of the most commonly used data types in Python include integers, floating-point numbers, strings, and booleans.
Integers: Integers are whole numbers and can be positive, negative, or zero. For example, 1, 2, 3, -4, and 0 are all integers.
Floats: Floating-point numbers, or floats, are numbers with decimal points. For example, 1.5, -2.7, and 0.0 are all floats.
Strings are sequences of characters, enclosed in either single or double quotes. For example, 'hello', "world", and "123" are all strings.
Booleans are either True or False values, and are often used in conditional statements. For example, 5 > 3 evaluates to True, while 5 < 3 evaluates to False.
Creating a variable: To create a variable in Python, you simply choose a name and assign it a value using the equals sign (=) operator. For example, the following code creates a variable called "my_variable" and assigns it the value 10:
my_variable = 10
Python is a dynamically typed language, which means that you don't need to specify the data type of a variable when you create it. Instead, Python infers the data type based on the value you assign to the variable.
You can use the built-in type() function to check the data type of a variable. For example:
my_variable = 10
print(type(my_variable))
Output: <class 'int'>
In addition to the basic data types, Python also supports several data structures, such as lists, tuples, and dictionaries, which can be used to store and manipulate multiple values.