4.1.5.2 高階函數(shù)電子課件幻燈片

高階函數(shù)高階函數(shù)高階函數(shù)以函數(shù)作為輸入輸出的函數(shù)函數(shù)的參數(shù)是函數(shù)函數(shù)的返回值是函數(shù)滿足一個(gè)即為高階函數(shù)高階函數(shù)defaction(name):print(name+"eat!")

defdo(animal,func):func(animal)

do("pig",action)pigeat!defdo(animal,func):func(animal)do("pig",lambdaname:print(name+"eat!"))pigeat!Python自帶的高階函數(shù)Python自帶的高階函數(shù)sortedmapreducefiltersorted函數(shù)sorted(iterable,key=None,reverse=False)stu_lst=[("Tom",20),("Jack",18),("Rose",18),("Lily",21)]new_lst=sorted(stu_lst)print(new_lst)[('Jack',18),('Lily',21),('Rose',18),('Tom',20)]stu_lst=[("Tom",20),("Jack",18),("Rose",18),("Lily",21)]new_lst=sorted(stu_lst,key=lambdaitem:item[1])print(new_lst)[('Jack',18),('Rose',18),('Tom',20),('Lily',21)]map函數(shù)map(function,sequence)defsquare(n):returnn**2num_list=[1,2,3,4,5]new_list=list(map(square,num_list))print(new_list)[1,4,9,16,25]map函數(shù)map(function,sequence)namelst=['adam','LISA','toM']m_namelst=map(lambdas:s.upper(),namelst)new_namelst=list(m_namelst)print(new_namelst)['ADAM','LISA','TOM']reduce函數(shù)reduce(function,sequence[,initial])fromfunctoolsimportreduceresult=reduce(lambdax,y:x+y,[1,2,3,4,5])print(result)15fromfunctoolsimportreduceresult=reduce(lambdax,y:x+y,[1,2,3,4,5],19)print(result)34filter函數(shù)filter(function,sequence)defis_even(n):returnn%2==0num_list=[1,2,3,4,5,6,7,8,9,10]new_list=list(filter(is_even,num_list))print(new_list)[2,4,6,8,10]應(yīng)用案例stu_lst=["04161589李雨昕男","04161588劉泳鋒男","04161578付懿楊男","04161576李立敏男","04161602吳謹(jǐn)男","04161579陳雨菲女","04161581劉凡釗女","04161585舒千茹女","04161582馬思琦女"]要求：按照學(xué)號(hào)對(duì)學(xué)生進(jìn)行分組。如果學(xué)號(hào)除以3的余數(shù)是1，則分到一組；如果學(xué)號(hào)除以3的余數(shù)是2，則將學(xué)生分到二組；如果學(xué)號(hào)能被3整除，則將學(xué)生分到三組。應(yīng)用案例defsplit_group(grouped,value):group_num=int(value.split()[0])%3ifgroup_num==1:grouped['一組'].append(value.split()[1:])elifgroup_num==2:grouped['二組'].append(value.split()[1:])elifgroup_num==0:grouped['三組'].append(value.split()[1:])returngroupedfromfunctoolsimportreducestu_lst=["04161589李雨昕男","04161588劉泳鋒男","04161578付懿楊男","04161576李立敏男","04161602吳謹(jǐn)男","04161579陳雨菲女","04161581劉凡釗女","04161585舒千茹女","04161582馬思琦女"]grouped_stu_dic=re