python--Numeric type

python numeric type

variables

-the variable is an area in memory.

Variable naming: Variables are composed of letters, numbers, and underscores.

The address variable in Python is the opposite of the C language, and a single piece of data contains multiple tags;

1. The difference between input and raw_input

Print + string

Input + Numeric type

Raw_input + Character type

Input receives numeric type data: How to make judgment leap year? and determine its type

This year can be divisible by 4 but not divisible by 100, or divisible by 400, then leap years

raw_input data that receives a string type:

2, arithmetic

Operators and expressions

Arithmetic operators: +,-, *,**,/,%,//

This method directly converts a shape to a floating-point type

Assignment operators: =, + =,-=,/=, *=,%=

Relational operators: >=, <, <=,! =, = =

Logical operators: Logical AND And, logical OR OR, logical non-not

3. Character type

1) difference between num=123 and num= "123"

2) integral type and long shaping

? Force defined as Long integer: num2 = 123L

3) Float type

? 1.2e10 represents a value of 1.2 of 10 times;

? 12e9 represents a value of 12 of 9 times;

4) plural type

? Python provides inline support for complex numbers, eg:3.14j, 8.32e-36j

5) Type bool

Examples:

First, the input of the results, and to find the average of the results

Second, the user login

1. User name and password system given;

2. When the user logs in, enter the user name and password to determine if the login is successful;

Enhancement Requirements:

1. User login has three opportunities, more than 3 times has not been successful, error;

2. If the username password is correct, the login is successful, exit the program; (Exit ())

python--Numeric type