#语法格式:filter(function, iterable)#实例1defis_odd(x):returnx % 2 == 1print(list(filter(is_odd,[1,2,3,4,5,6,7,8,9])))#python3中不使用list强转数据类型的话,filter返回的是迭代器'''结果: [1, 3, 5, 7, 9]'''#实例2s ='jason lv'iterator= filter(lambdax : x !='a',s...
Python里sorted函数,定义如下: Definition:sorted(iterable:Iterable[SupportsLessThanT],/,*,key:None=...,reverse:bool=...)->List[SupportsLessThanT]Returnanewlistcontainingallitemsfromtheiterableinascendingorder.Acustomkeyfunctioncanbesuppliedtocustomizethesortorder,andthereverseflagcanbesettorequesttheresultin...
后面的func作为字典的值,只是指向了一个函数,它是不确定的 print(dict2) # 输出:{100: <function func at 0x000001B88355D1F0>},可以看到字典的值是一个函数 print(dict2[100](b)) # 输出:10.0 print(dict2[a](c)) # 输出:abc 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14....
cmp_to_key() 在functools包里的函数,将老式的比较函数(cmpfunction)转化为关键字函数(keyfunction)。 与接受key function的工具一同使用(如 sorted(), min(), max(), heapq.nlargest(), itertools.groupby())。该函数主要用来将程序转成 Python 3 格式的,因为 Python 3 中不支持比较cmp()。 sorted(iterabl...
python >>> help(sorted) Help on built-in function sorted in module builtins: sorted(iterable, /, *, 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 ...
"""This function is primarily used as a transition tool for programsbeing converted from Python 2 which supported the use of comparison functions.1. python2支持比较方法,现在不支持了。2. 需要将对比方法转化为关键方法。2. cmp_to_key 就是将对比方法转为关键方法。"""A comparison function is any ...
``object_hook`` is an optional function that will be called with the result of any object literal decode (a ``dict``). The return value of ``object_hook`` will be used instead of the ``dict``. This feature can be used to implement custom decoders (e.g. JSON-RPC class hinting)...
python对列表中的字典按[key]时间排序 #coding:utf-8""" author:the5firedate:2012-10-10function:sort dict list by key"""importdatetime result_data=[]result_data.append({'id':2,'create_time':'2012-10-8 11:09:22',})result_data.append({'id':3'create_time':'2012-10-10 11:09:22'...
MANIFEST.in Makefile README.rst Vagrantfile hkdf.py setup.py tests.py tox.ini This module implements the HMAC Key Derivation function, defined at http://tools.ietf.org/html/draft-krawczyk-hkdf-01 There are two interfaces: a functional interface, with separate extract and expand functions as ...
Function: 开始界面 Input: --screen: 游戏界面 Return: --game_mode: 1(单人模式)/2(双人模式) ''' def startInterface(screen): clock = pygame.time.Clock whileTrue: screen.fill((41, 36, 33)) button_1 = Button(screen, (150, 175),'1 Player') ...