本文实例讲述了python实现忽略大小写对字符串列表排序的方法，是非常实用的技巧。分享给大家供大家参考。具体分析如下：
先来看看如下代码：
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string
=
'''
the stirng
Has many
line In
THE fIle
jb51 net
'''
list_of_string
=
string.split()
print
list_of_string
#将字符串分离开，放入列表中
print
'*'
*
50
def
case_insensitive_sort(liststring):
listtemp
=
[(x.lower(),x)
for
x
in
liststring]
#将字符串列表，生成元组，（忽略大小写的字符串，字符串）
listtemp.sort()
#对元组排序，因为元组为：（忽略大小写的字符串，字符串），就是按忽略大小写的字符串排序
return
[x[
1
]
for
x
in
listtemp]
#排序完成后，返回原字符串的列表
print
case_insensitive_sort(list_of_string)
#调用起来，测试一下
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结果：
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[
'the'
,
'stirng'
,
'Has'
,
'many'
,
'line'
,
'In'
,
'THE'
,
'fIle'
,
'jb51'
,
'net'
]
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
[
'fIle'
,
'Has'
,
'In'
,
'jb51'
,
'line'
,
'many'
,
'net'
,
'stirng'
,
'THE'
,
'the'
]
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另一种方法：
使用内建函数
sorted(iterable[,cmp[, key[,reverse]]])
该函数的官方描述文档如下：
Return a new sorted list from the items in iterable.
key specifies a function of one argument that is used to extract a comparison key from each list element:key=str.lower. The default value isNone.
使用参数key=str.lower
完整代码如下：
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string
=
'''
the stirng
Has many
line In
THE fIle
jb51 net
'''
list_of_string
=
string.split()
print
list_of_string
#将字符串分离开，放入列表中
print
'*'
*
50
def
case_insensitive_sort2(liststring):
return
sorted
(liststring,key
=
str
.lower)
print
case_insensitive_sort2(list_of_string)
#调用起来，测试一下
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效果一样~
方法三：
使用list的sort方法：
该方法的官方描述文档如下：
The sort() method takes optional arguments for controlling the comparisons.
cmp specifies a custom comparison function of two arguments (list items) which should return a negative, zero or positive number depending on whether the first argument is considered smaller than, equal to, or larger than the second argument: cmp=lambda x,y: cmp(x.lower(), y.lower()). The default value is None.
key specifies a function of one argument that is used to extract a comparison key from each list element: key=str.lower. The default value is None.
reverse is a boolean value. If set to True, then the list elements are sorted as if each comparison were reversed.
具体代码如下：
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string
=
'''
the stirng
Has many
line In
THE fIle
jb51 net
'''
list_of_string
=
string.split()
print
list_of_string
#将字符串分离开，放入列表中
print
'*'
*
50
def
case_insensitive_sort3(liststring):
liststring.sort(
cmp
=
lambda
x,y:
cmp
(x.lower(), y.lower()))
case_insensitive_sort3(list_of_string)
print
list_of_string
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但这次调用的时候就有区别了。