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#  -*- coding:utf-8 -*- 
s = ['a','b','c','d']

for i in range(len(s)):
    print(i,s[i])    #代码缩进：tab键值=4个空格
 
input()

#生成以下索引序列
#0 a 

rswofxd

#  -*- coding:utf-8 -*- 
for n in range(2,10)
    for x in range(2,n)
        if n % x==0:
            print(n,'equals',x,'*',n//x)
            break        #而pass语句不做任何操作
        else:
            print(n,'is a prime number')
            
input()

rswofxd

# -*- coding:utf-8 -*-
def fib2(n):
    """Return a list containing the Fibonacci series up to n."""   #docstring(must be """)
    result = []
    a,b = 0,1
    while b<n :
        result.append(b)
        a,b = b,a+b 
    return result

rswofxd

#! /usr/bin/python
# -*- coding: utf8 -*- 
me=input("input your name:")
print("你好，%s"%me)

rswofxd

#字符串和数字

a=2                      #text
b="test"

#how to put int to str 
c=str(a)+b
d="1111"                 #number

#how to put str to int 

rswofxd

# -*- coding:utf-8 -*-
args = [3,6]
list(range(*args))                     #‘*’用于拆分列表关键字参数操作符
#>>>[3,4,5]
def fun(a,b=3,c,d='hello'):
    .......
h = {fr:7,tw:8,th:'world',fo:'hello'}
>>>fun(**h)                             #‘**’用于拆分字典关键字参数操作符

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# -*- coding:utf-8 -*-
class MyClass:
    '"A simple example class"'
    __name__   #.........default property........
    __bases__  #       when  class is named
    __dict__   #.........data property...........
    def __init__(self,vars1,vars2):  #'self' is the default first arg for function in a class 
        self.m = vars1
        self.n = vars2
        .....                        #called when class is exampled,and return 'None'

rswofxd

# -*- coding:utf-8 -*-
list.append(x)                 #a[len(a):]=[x]
list.extend(L)                  #a[len(a):]=L
list.insert(i,x)                #a.insert(0,x)put x into head
list.remove(x)        #remove the first x 
list.pop([i])            #remove i and return i ,the '[]' mean 'optionnal',or it may remove and retrun the last one
list.index(x)       #to get the index of the first x 
list.count(x)      #to count the times of x-disapearing
list.sort()          #to sort the list
list.reverse()      #to reverse the list

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#列表类似Javascript的数组,方便易用

#定义元组
word=['a','b','c','d','e','f','g']

#如何通过索引访问元组里的元素
a=word[2]
print ("a is: "+a)
b=word[1:3]
print ("b is: ")

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# -*- coding:utf-8 -*-
#..........file..............
#open(filename,mode),mode is optional,and return a file object 
f = open('/xx/xx/file','r/w/r+/a')

f.read(size)
f.read(line)
f.read(lines)
for line in f:                          #all-list the file content
    print(line,end=' ')