The basic syntax of python

Python3-- Python basic syntax of python basis

1. The first sentence python

- suffix can be any? (When the module is introduced, is not applicable)
- file extensions are .py

2. State of implementation

python interpreter py file path

pyhton real-time input into the interpreter and read results

Interpreter path

#! / Usr / bin / env python python2 the beginning of a comment

coding

# -*- coding:utf8 -*-

ascil 00000000 eight digits

unicode 0000000000000000+ digits to represent at least 16

How many expressed utf-8 can represent how much to use

5. perform a complicated operation

To remind the user to enter: Username Password

Obtain a user name and password, detection: username root password root

Log on success

Error and fails

a.input usage always wait until the user enters the value assigned to the variable input

6. The variable name

Variables only by

letter

digital

Underline

Exception: can not start with a number

e.g. python keyword '' class '', etc.

7. Conditional statements

(1) if conditions:

Internal block

else:

...

#TAB four keys on behalf of that position

(2) if else can support nesting

Multi-conditional (3) if elif of

inp = input ( 'Please enter your membership level' ) 
IF Inpu == "senior member" : 
Print ( 'beauty' ) 
elif InP == "Platinum Member" :  Print ( 'modol' )  elif InP == "star" : Print ( 'urban management') 
Print ( 'start serving it ....')

Why (4) Supplementary psss not perform
IF 1 == 1:
Pass
the else:
command statement

8. The basic data types

String (in quotes), for example: name = "alex" or name = 'alex'

N1 addition string = 'alex' n2 = 'sb' n3 = n1 + n2

Multiplication string n1 = 'alex' n2 = n1 * 10

Digital I arithmetic th (4 th 4) a4 = 39% 8 a3 = 4 ** 4 (39 remainder acquired by dividing 8)

a5 = 39 // 8 (two diagonal lines taken supplier

9. circulation

Infinite loop:
the while. 1. 1 ==:
Print ( 'OK')

a conditional loop
COUNT = 0
Import Time
the while COUNT <10:
Print (COUNT, the time.time)
COUNT = COUNT +. 1
Print (123)

10. Exercises
(1) while loop input 1234568910

count = 1
while count != 7 and count < = 10:
print(count)
count = count + 1

The second solution

n = 1
while n < 11:
if n == 7:
pass
else:
print(n)
n =n + 1
print('------end----')

(2) find all the numbers from 1 to 100 and

num = 1
count = 1
while count <= 100:
count = count + 1
num = num +count

In all odd (3) Output 1-100

count = 0 
while count < 100:
a1 = count % 2
if a1 == 0:
pass
else: 
print(a1)
count = count +1

In all even (4) Output 1-100

count = 0 
while count < 100:
a1 = count% 2
if a1 == 0:
print(a1)
count = count +1
else:
pass

(5) Find the number of + 1-2 + 3-4 and all 5 ... 99

. 1 = n- 
S = 0 # S is the sum before all 
the while n-<100 : 
TEMP = n-2%
 IF TEMP == 0: 
S = S - n- 
n- = n-+. 1
 the else 
S = S + n- 
n- = n-+ . 1
 Print (S)

The basic syntax of python

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