1 >>> greeting = ("hello")
2 >>> greeting[1]
3 'e'
4 >>> greeting[-2]
5 'l'

 1 >>> num = [1,5,4,7,0]　　#从左往右分片起始索引为0，从右往左分片起始索引为-1
 2 >>> num[1:3]
 3 [5, 4]
 4 >>> num[0:-2]
 5 [1, 5, 4]
 6 >>> num[2:-2]
 7 [4]
 8
 9 #开始点的元素包括在结果之中，结束点的元素则不在分片之内；
10 #对于一个正数步长，会从序列头部开始向右提取元素，直到最后一个元素，对于负数步长，则从序列的尾部开始向左提取元素，直到第一个元素
11 >>> num[0:4:2]　　　　　　　　　　　　
12 [1, 4]
13 >>> num[::-2]
14 [0, 4, 1]
15 >>> num[2::-2]
16 [4, 1]
17 >>> num[:2:-2]
18 [0]

 1 >>> [1,2,3]+[4,5]
 2 [1, 2, 3, 4, 5]
 3 >>> 'hello'+'world'
 4 'helloworld'
 5 >>> [1,2,3]+'hello'
 6
 7 Traceback (most recent call last):
 8   File "<pyshell#201>", line 1, in <module>
 9     [1,2,3]+'hello'
10 TypeError: can only concatenate list (not "str") to list

1 >>> 'python,'*5
2 'python,python,python,python,python,'
3 >>> seq = [None]*10　　　　#初始化一个长度为10的列表
4 >>> print seq
5 [None, None, None, None, None, None, None, None, None, None]
6 >>> print '!'*5 + 'Hello ,World' + '-'*10　　　　
7 !!!!!Hello ,World----------

 1 >>> 'P'in 'Python'
 2 True
 3 >>> 'p'in 'Python'
 4 False
 5
 6 >>> 'P'in Python　　#注意'Python'和Python区别
 7
 8 Traceback (most recent call last):
 9   File "<pyshell#211>", line 1, in <module>
10     'P'in Python
11 NameError: name 'Python' is not defined

 1 #并行迭代
 2 >>> names = ['ann','beth','tita','jane']
 3 >>> ages = ['21','19','18','22']
 4 >>> zip(names,ages)
 5 [('ann', '21'), ('beth', '19'), ('tita', '18'), ('jane', '22')]
 6 >>> for name,age in zip(names,ages):　　　　　　#zip可以处理不等长的序列
 7     print name, 'is' ,age ,'years old'
 8
 9 ann is 21 years old
10 beth is 19 years old
11 tita is 18 years old
12 jane is 22 years old
13
14 #索引迭代
15 >>> strings = 'python'
16 >>> for index,string in enumerate(strings):
17     if '3' in strings:
18         strings[index] = 'h'
19
20 #翻转和排序迭代：reversed方法返回一个可迭代对象，sorted方法返回列表
21 >>> sorted([2,0,7,5])
22 [0, 2, 5, 7]
23 >>> reversed('hello')
24 <reversed object at 0x02FF8C70>
25 >>> list(reversed('hello'))
26 ['o', 'l', 'l', 'e', 'h']

1 >>> num = [120,14,39]
2 >>> len(num)
3 3
4 >>> max(num)
5 120
6 >>> min(num)
7 14