You have a list of objects that you need to sort according to one attribute of each object, as rapidly and portably as possible. Solution In this case, the obvious approach is concise, but quite slow: def sort_by_attr_slow(seq, attr): def cmp_by_attr(x, y, attr=attr): return cmp...
2. Sort a List of Lists Using itemgetter() Function You can use theitemgetter()function from the operator module as akeyfunction when sorting a list of lists in Python. Theitemgetter()function returns a callable object that accesses the specified item(s) of an object, which can be used to...
Python has two basic function for sorting lists:sortandsorted. Thesortsorts the list in place, while thesortedreturns a new sorted list from the items in iterable. Both functions have the same options:keyandreverse. Thekeytakes a function which will be used on each value in the list being ...
/, *, key=None, reverse=False) Return a new list containing all items from the iterable in ascending order. A custom key function can be supplied to customize the sort order, and the reverse flag can be set to request the result in descending order. ...
special attribute: ... class: ... function: ... getmembers: Return all members of an object as (name, value) pairs sorted by name. getdoc: Get the documentation string for an object. getmodule: Return the module an object was defined in, or None if not found. getfile: Work out whi...
>>> a.sort() >>> a [1, 2, 3, 4] >>> a.sort(reverse=True) >>> a [4, 3, 2, 1] 实例:http://www.cnblogs.com/0bug/p/8671934.html 列表嵌套 一个列表中的元素又是一个列表,那么这就是列表的嵌套 1 2 3 >>> alist = [1,[2,3],4] >>> alist[1][1] 3 数据类型--元...
错误消息(如栈跟踪)被写入到sys.stderr,但与写入到sys.stdout的内容一样,可对其进行重定向,例如:$ cat somefile.txt | python somescript.py | sort。可以认为,somescript.py从其sys.stdin中读取数据(这些数据是somefile.txt写入的),并将结果写入到其sys.stdout(sort将从这里获取数据)。'''#somescript.py...
Return a new list containing all items from the iterable in ascending order. A custom key function can be supplied to customize the sort order, and the reverse flag can be set to request the result in descending order. 像操作列表一样,sorted()也可同样地用于元组和集合: ...
Operator模块中的itemgetter, attrgetter两个方法可以有效的支持L.sort()、sorted()两种排序方法。 itemgetter: itemgetter(item, …) –> itemgetter object Return a callable object that fetches the given item(s) from its operand. After f = itemgetter(2), the call f(r) returns r[2]. ...
remove 删除List中一个指定Value的元素 排序列表元素 sort 正向排序 Operator Module支持排序 reverse 逆向排序 count 统计元素在list中出现的次数 List的深Copy和浅Copy 最后 前言 在上一篇中介绍了Python的序列和String类型的内置方法,本篇继续学习作为序列类型成员之一的List类型的内置方法。