Python Learning chapter I (Python Basic Programming second edition)

Chapter One: Basic knowledge

1. Double slash: The operator that implements the divide

>>>1//2

0

Even if it is a floating-point number, the slash will perform the divide

>>>1.0//2.0

0.0

2. Power (exponentiation) operator: Double star

>>>2**3

8

Tip: You can use the function POW instead of the operator, pow (2,3)

3.16 Binary and octal

Hex: Front plus 0x, first is number 0

>>>0xaf

175

Octal: Add 0o to Python in version 3.0, the first number is 0, the second is the letter O

>>>0o10

8

4. Get user input

With the python3.5.0 version, you need to convert the string operation if you enter a number

>>>x=input ("x:")

X:34

Here the 34 default is the string, if the need is a number, then the conversion operation

>>>x=int (Input ("x:"))

X:34

The value of x here is a number, which can be manipulated

5. Functions

The round function rounds the floating-point number to the nearest integer value

>>>round (1.0/2.0)

Python Learning chapter I (Python Basic Programming second edition)