The definition and Type introduction of Python variable

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Definition of variables

In the program, sometimes we need to sum two pieces of data, so what should we do?

Let's make an analogy in real life, such as going to the supermarket to buy things, often we need a basket to store items, and when all the items are purchased, we can check out at the cashier.

If you need to sum two or more pieces of data in the program, you need to store the data first and then add them up.

In Python, you need something called a variable to store a piece of data, as shown in the following example:

Num1 = 100 # num1 is a variable, just like a small basket

Num2 = 87 # num2 is also a variable

Result = num1 + num2 # accumulate the data from the num1 and num2 "baskets" and put them into the result variable

The so-called variable can be understood as a vegetable basket.

If you need to store multiple data, the easiest way is to have multiple variables, of course, you can also use a

Programs are used to process data, and variables are used to store data.

Type of variable

In program:

In order to make better use of memory space and manage memory more efficiently, there are different types of variables, as follows:

How do you know the type of a variable?

In python, as long as a variable is defined and it has data, its type has been determined. There is no need for us developers to take the initiative to explain its type, and the system will automatically identify it.

You can use type (the name of the variable) to see the type of variable as shown in the following figure:

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