Python (day1)-data types and variables

Data type:

Integers: integers, including positive integers, 0, negative integers

Floating point: In layman's words, it's a decimal.

Long integers: A long integer, usually followed by an L-

String: The string needs to be enclosed in "or". Single and double quotes can appear simultaneously, such as "I ' m jake!"

Boolean value: Only two True, False

Null: denoted by none, but not the same as 0. Since 0 is also a value, it is not empty.

Do you see the difference?

Variable:

Variable: consists of letters, numbers, and underscores, but cannot begin with a number. such as a, _a, A7 These are legal, 7a this is illegal.

When naming variables, there are usually several principles:

1. Cannot use keyword as variable name

2. The variable name is as explicit as possible, that is, to indicate the meaning of the variable, such as Age = 12, a

3. If the variable has more than one word, connect it with an underscore, such as My_name

4. The above variables can also capitalize the first letter of the word, such as MyName

Assignment of variables:

For example, age = 12, this completes the assignment. If it's a string, use quotation marks like name = ' Jack '

Python (day1)-data types and variables