>>>from operator import itemgetter,attrgetter,methodcaller>>>sorted(student_tuples,key=itemgetter(2))[('dave','B',10),('jane','B',12),('john','A',15)]>>>sorted(student_objects,key=attrgetter('age'))[('dave','B',10),('jane','B',12),('john','A',15)] 1. 2. 3. 4. ...
Usefunctools.cmp_to_key()to convert an old-stylecmpfunction to akeyfunction. The built-insorted()function is guaranteed to be stable. A sort is stable if it guarantees not to change the relative order of elements that compare equal — this is helpful for sorting in multiple passes (for e...
其大意为:sorted函数返回一个新的可迭代的列表,sorted函数有两个可选参数,必须将其指定为关键字参数,key:用列表元素的某个属性或函数进行作为关键字,有默认值为None(直接与元素进行比较);reverse:一个bool变量,设置为True,为降序,设置为False,为升序。
>>>from operatorimportitemgetter,attrgetter,methodcaller>>>sorted(student_tuples,key=itemgetter(2))[('dave','B',10),('jane','B',12),('john','A',15)]>>>sorted(student_objects,key=attrgetter('age'))[('dave','B',10),('jane','B',12),('john','A',15)] operator模块还有可以进...
首先我们来看一下sort的定义L.sort(key=None, reverse=False),有两个可选参数key和reverse。key是排序的值,everse = True 降序 或者 reverse = False 升序 sort sorted 代码语言:javascript 代码运行次数:0 运行 AI代码解释 sorted(iterable,key=None,reverse=False)Return anewlistcontaining all items from the...
Use functools.cmp_to_key() to convert an old-style cmp function to a key function. The built-in sorted() function is guaranteed to be stable. A sort is stable if it guarantees not to change the relative order of elements that compare equal — this is helpful for sorting in multiple pa...
key,if provided, specifies a function of one argument that is used to extract a comparison key from each element in the iterable: key=str.lower Equivalent to:sorted(iterable, key=key)[:n] 二、 不常用接口 heapq.heappushpop(heap, item) Push item on the heap, then pop andreturn the ...
Data can be sorted alphabetically or numerically. Thesort keyspecifies the criteria used to perform the sort. It is possible to sort objects by multiple keys. For instance, when sorting users, the names of the users could be used as primary sort key, and their occupation as the secondary so...
in `other`, otherwise joins index-on-index. If multiple values given, the `other` DataFrame must have a MultiIndex. Can pass an array as the join key if it is not already contained in the calling DataFrame. Like an Excel VLOOKUP operation. ...
With the sorted() function, you can specify a sort key by passing a callback function as a key argument. Note: The key argument has nothing to do with a dictionary key! To see a sort key in action, take a look at this example, which is similar to the one you saw in the section...