Python--003--Process Control while,for

Process Control
Sequential processes: Each line of code executes and is executed only once
···
If--Else struct statement:
1. If Boolean expression:
Code alignment, tab and space can not appear at the same time

2. If Boolean expression:
Code
Else

Money = input (' Please input your money: ')
If Money > 100:
print ' You're vip! '
print ' You are Gold VIP '
else:
Print (' You're not vip! ')

3, If--else nested:
An If Boolean expression:
Code
Else
An If Boolean expression:
Code
Else
Code
....

Money = input (' Please input your money: ')
If Money > 100:
print ' You're vip! '
If Money >= 200:
print ' You're golden VIP '
If 200>money>100:
print ' You're a silver VIP '
else:
If money<0:
print ' error! '
Else
Print (' You're not vip! ')

4. If Boolean expression:
Code
elif Boolean expression:
Code

Money = input (' Please input your money: ')
If Money > 100:
print ' You're vip! '
If Money >= 200:
print ' You're golden VIP '
If 200>money>100:
print ' You're a silver VIP '
Elif money<0:
print ' error! '
Else
Print (' You're not vip! ')

EG:
The first type:
#coding: UTF-8
score = Int (input (' Please input a score: '))

If 100>=score>=90:
Print (' very good ')
If 90>=score>=70:
Print (' Well done! ')
If 70>=score>=60:
Print (' pass! ')
If 60>score:
Print (' failed! ')
If score>100 or score<0:
Print (' error! ')

The second type:

- -coding:cp936--

score = Int (input (' Please input a score: '))

If 100>=score>=90:
Print (' very good ')
Else
If 90>=score>=70:
Print (' good ')
Else
If 70>=score>=60:
Print (' Pass ')
Else
If 60>score>=0:
Print (' fail ')
Else
Print (' error! ')
The third type:
score = Int (input (' Your number: '))
If 100>=score>=90:
Print (' excellent ')
Elif 90>=score>=70:
Print (' good ')
Elif 70>=score>=60:
Print (' Pass ')
Elif 60>score>=0:
Print (' Flunk ')
Else
Print (' error! ')

Cycle flow
·· While loop

Run some code repeatedly
1. Syntax:
While Boolean expression:
Code: (Loop body)
Note: To avoid a dead loop (notice that the loop jumps out of the condition)
Server is a dead loop7 365
num = 0
While num<10:
print ' Hello world! '
Num+=1

····· For loop
1. Syntax:
For-Target in expression:
Loop body

                            目标：变量                            表达式：字符串、列表、元祖----可迭代对象

A = ' Baizhi '
For I in A:
Print I

Teacher = [' Fei ', ' xige ', ' Kuai ']
For I in teacher:
Print I

Number = [123,466,969]
For I in number:
Print I

Range ()
Grammar:
Range ([Start],stop[,step=1])
1. This function has three parameters, where square brackets indicate selectable parameters ()
2, the first parameter default is 0, the second parameter stop, the third default 1
3, the function generates a value, starting from start, to stop ending the number sequence
Value range from [Start,stop] left closed right open

A = range (0,3,1)

>> A
[0, 1, 2]
>>
>> A=range (0,10,2)
>> A
[0, 2, 4, 6, 8]
>> a = range (0,10,3)
>> A
[0, 3, 6, 9]
>> Range (3)
[0, 1, 2]

For I in range (5):
Print I

01
2
3
4

>> for I in range (2,5):
Print I

2
3
4

>> for I in Range (1,5,2):
Print I

1
3

·· Break
Jumps out of the current loop, not all subsequent loops

While True:
num = input (' Please input your number: ')
If num ==1:
Break
Print (' Error,try again! ')

Please input your number:3
Error,try again!
Please input your number:1

continue
Skip this cycle without affecting the next loop

For I in range (10):
If i%2!=0:
Continue
Print I

02
4
6
8

>> for I in range (10):
If i%2!=0:
Break
Print I

Python--003--Process Control while,for