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python实现忽略大小写对字符串列表排序的方法

2020-02-23 05:51:49
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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:

string = '''the stirngHas manyline InTHE fIlejb51 net'''list_of_string = string.split()print list_of_string   #将字符串分离开,放入列表中print '*'*50def 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', 'jb51', 'net']**************************************************['fIle', 'Has', 'In', 'jb51', 'line', 'many', 'net', 'stirng', 'THE', 'the']

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:

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

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:

string = '''the stirngHas manyline InTHE fIlejb51 net'''list_of_string = string.split()print list_of_string   #将字符串分离开,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            
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