使用functools模块 Python的functools模块提供了一个cmp_to_key()函数,可以将比较函数转换为key函数,用于排序和其他需要比较的函数。比如,我们可以这样使用cmp_to_key()函数: fromfunctoolsimportcmp_to_keydefcompare(a,b):ifa
自定义比较函数 如果你需要自定义比较规则,可以使用functools.cmp_to_key函数。这个函数接受一个比较函数作为参数,并返回一个可以用于排序的关键字函数。 fromfunctoolsimportcmp_to_keydefcompare(x,y):ifx<y:return-1elifx>y:return1else:return0lst=[3,1,4,1,5,9,2,6]sorted_lst=sorted(lst,key=cmp_to...
python3.x中cmp函数会NameError: name 'cmp' is not defined【cmp函数在3.x开始就去掉了,若想实现比较功能可用operator】 **报错原因:**因为python3.x中cmp函数去掉了,如果需要实现比较功能,那么可引入operator 模块。 operator模块,适合任何对象,包含的方法有: operator实例 在python3.x中用cmp函数功能的实例 py...
NameError: name 'cmp' is not defined **报错原因:**因为python3.x中cmp函数去掉了,如果需要实现比较功能,那么可引入operator 模块,提供了6个比较运算符。gt lt ge eq le importoperator#首先要导入运算符模块operator#integersx,y = 100,200print("x:",x,", y:",y)print("operator.gt(x,y):", op...
示例1: cmp_to_key ▲点赞 6▼ # 需要导入模块: import _functools [as 别名]# 或者: from _functools importcmp_to_key[as 别名]defcmp_to_key(mycmp):"""Convert a cmp= function into a key= function"""classK(object):__slots__ = ['obj']def__init__(self, obj):self.obj = objdef...
>>> cmp(1, 2) Traceback (most recent call last): File "<pyshell#0>", line 1, in <module> cmp(1, 2) NameError: name 'cmp' is not defined --- python 3.2.2 是不是取消了cmp了,取消的话有没有和cmp一样功能的函数呢?赞 回复 转发 赞 收藏 只看楼主 longbo567 ...
(pending_tasks, key=cmp_to_key(sort_tasks)): File "/home/bioinfo5/miniconda3/lib/python3.6/site-packages/ete3/tools/ete_build_lib/scheduler.py", line 75, in __lt__ return mycmp(self.obj, other.obj) < 0 File "/home/bioinfo5/miniconda3/lib/python3.6/site-packages/ete3/tools/...
Communication is key to getting through a crisis because it keeps all the necessary players -- ranging from a single office to a global audience -- informed. As the crisis develops and evolves, the organization should update its communications. ...
Environment variable values must not be enclosed in quotes even if they include whitespace. Table 3. HTTP Server environment variables used to configure the certificate recipients Table 4. HTTP Server environment variables used to control tracing...
this code results in only the year, month, and date portion of the field value being stored in the database. Later if the client tries to find this bean by primary key as follows, the bean is not found in the database because the value does not match the one that is stored in the...