本文實例講述了python實現忽略大小寫對字符串列表排序的方法，是非常實用的技巧。分享給大家供大家參考。具體分析如下：

先來看看如下代碼：

string = '''the stirngHas manyline InTHE fIlejb51 net'''list_of_string = string.split()print list_of_string   #將字符串分離開，放入列表中print '*'*50def case_insensitive_sort(liststring):  listtemp = [(x.lower(),x) for x in liststring]#將字符串列表，生成元組，（忽略大小寫的字符串，字符串）  listtemp.sort()#對元組排序，因為元組為：（忽略大小寫的字符串，字符串），就是按忽略大小寫的字符串排序  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)#調用起來，測試一下

結果：

['the', 'stirng', 'Has', 'many', 'line', 'In', 'THE', 'fIle', 'jb51', 'net']**************************************************['fIle', 'Has', 'In', 'jb51', 'line', 'many', 'net', 'stirng', 'THE', 'the']

另一種方法：

使用內建函數
sorted(iterable[,cmp[, key[,reverse]]])

該函數的官方描述文檔如下：

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.

使用參數key=str.lower

完整代碼如下：

string = '''the stirngHas manyline InTHE fIlejb51 net'''list_of_string = string.split()print list_of_string   #將字符串分離開，放入列表中print '*'*50def case_insensitive_sort2(liststring):  return sorted(liststring,key = str.lower)print case_insensitive_sort2(list_of_string)#調用起來，測試一下

效果一樣~

方法三：

使用list的sort方法：

該方法的官方描述文檔如下：

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.

具體代碼如下：

string = '''the stirngHas manyline InTHE fIlejb51 net'''list_of_string = string.split()print list_of_string   #將字符串分離開，放入列表中print '*'*50def 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