Variables store data from "summary" of Python Programming by John M. Zelle
When we write a program, we often need to keep track of information. We use variables to store this information. A variable is a named storage location in the computer's memory where we can store a value. When we create a variable, we give it a name so that we can refer to it later in the program. In Python, we can create a variable by using an assignment statement. An assignment statement has the following form: variable_name = value. The variable name is the name of the variable we are creating, and the value is the value that we want to store in the variable. For example, we can create a variable called 'age' and store the value 25 in it by writing: age = 25. Now whenever we refer to the variable 'age' in our program, Python will know that we are talking about the value 25. Variables can store different types of data, such as integers, floating-point numbers, strings, lists, and more. The type of data that a variable can store is determined by the value that we assign to it. For example, if we assign the value 25 to a variable, Python will create an integer variable. If we assign the value 3.14, Python will create a floating-point variable. It is important to choose meaningful variable names so that our code is easy to read and understand. Variable names should be descriptive and indicate the purpose of the variable. This makes our code more readable and maintainable. In Python, variables are dynamically typed, which means that we do not have to declare the type of a variable before using it. Python automatically determines the type of a variable based on the value that we assign to it. This makes Python flexible and easy to use.
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