十三、python列表方法汇总

'''
1.append():更新列表
'''
l=[]
l.append('111')
l.append('[123,456]')
print l
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['111', '[123,456]']
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'''
2.del:删除列表
'''
l=['111','222','abc','women','[11,22,33]']
print l
del l[1]
print l

--------------------------------------------

    ['111', '222', 'abc', 'women', '[11,22,33]']
    ['111', 'abc', 'women', '[11,22,33]']

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'''
3.len():获取列表长度
'''
l=['111','666','888','abc']
print len(l)

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   4

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'''
4.+:拼接列表，*用于重复列表
'''

l1=['aaa','bbb','ccc','ddd']
l2=['11','22','33']
print l1+l2
print l1*4

--------------------------------------------

    ['aaa', 'bbb', 'ccc', 'ddd', '11', '22', '33']
    ['aaa', 'bbb', 'ccc', 'ddd', 'aaa', 'bbb', 'ccc', 'ddd', 'aaa', 'bbb', 'ccc', 'ddd', 'aaa', 'bbb', 'ccc', 'ddd']

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'''
5.list(tuple):将元祖转化成列表
'''
tup=('aaa','111','abx')
print list(tup),type(list(tup))

--------------------------------------------

    ['aaa', '111', 'abx'] <type 'list'>

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'''
6.count():用于统计某个元素在列表中出现的次数
'''

l=['123','abc','123','aaa','bbb']
print l.count('123')
print l.count('aaa')

--------------------------------------------

   2

   1

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'''
7.index():用于从列表中找出某个值第一个匹配项的索引位置
'''

l=['11','222','aaa','bbb','222','cc']
print l.index('222')
print l.index('cc')

--------------------------------------------

   1

   5

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'''
8.extend():函数用于在列表末尾一次性追加另一个序列中的多个值（用新列表扩展原来的列表）。
'''
l1=['11','22','33']
l2=['aa','bb','cc']
l1.extend(l2)
print l1

--------------------------------------------

  ['11', '22', '33', 'aa', 'bb', 'cc']

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'''
9.insert(obj,str):指定位置插入指定对象
'''
l=['11','22','33','44']
l.insert(1,['aa','bb','cc'])

print l

--------------------------------------------

['11', ['aa', 'bb', 'cc'], '22', '33', '44']

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'''
10.pop([index=-1]):移除列表中的一个元素（默认为最后一个元素），可选择元素
'''

l=['11','22','33','44']
print l
l.pop()
print l
l.pop(1)
print l

--------------------------------------------

    ['11', '22', '33', '44']
    ['11', '22', '33']
    ['11', '33']

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'''
11.remove(obj):用于移除列表中某个值的第一个匹配项。
'''

l=['11','222','aaa','bbb','222','cc']
l.remove('222')
print l

--------------------------------------------

   ['11', 'aaa', 'bbb', '222', 'cc']

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'''
12.reverse()：反向列表中的元素
'''
l=['11','22','33','44']
l.reverse()
print l

--------------------------------------------

   ['44', '33', '22', '11']

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'''
13.sort()：用于对原列表进行排序（默认升序），如果指定参数，则使用比较函数指定的比较函数。
reverse -- 排序规则，reverse = True 降序， reverse = False 升序（默认）。
'''
l=['11','222','aaa','bbb','222','cc']
l.sort()
print l
l=['11','222','aaa','bbb','222','cc']
l.sort(reverse=True)
print l

--------------------------------------------

    ['11', '222', '222', 'aaa', 'bbb', 'cc']
    ['cc', 'bbb', 'aaa', '222', '222', '11']

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