python_忽略大小写对字符串列表排序
直接上代码
string = '''
the stirng
Has many
line In
THE fIle
'''
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，测试一下结果：
['the', 'stirng', 'Has', 'many', 'line', 'In', 'THE', 'fIle']
**************************************************
['fIle', 'Has', 'In', 'line', 'many', 'stirng', 'THE', 'the']另一种方法：
使用内建函数
sorted ( iterable [, cmp [, key [, reverse ] ] ] )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.
代码如下：
def case_insensitive_sort2(liststring):
return sorted(liststring,key = str.lower)效果一样~
方法三：
使用list的sort方法：
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.
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