deflong_words(n,str):word_len=[]txt=str.split("")forxintxt:iflen(x)>n:word_len.append(x)returnword_lenprint(long_words(3,"Thequickbrownfoxjum...
defcount_range_in_list(li,min,max):ctr=0forxinli:ifmin<=x<=max:ctr+=1returnctrlist1=[10,20,30,40,40,40,70,80,99]print(count_range_in_list(...
defmatch_words(words):ctr=0forwordinwords:iflen(word)>1andword[0]==word[-1]:ctr+=1returnctrprint(match_words(['abc','xyz','aba','122771']))&n...
defcommon_data(list1,list2):result=Falseforxinlist1:foryinlist2:ifx==y:result=Truereturnresultprint(common_data([1,2,3,4,5],[5,6,7,8,9]))print(c...
nums=[5,15,35,8,98]fornum_index,num_valinenumerate(nums):print(num_index,num_val) ...
a='"srting"'print(a)b=eval(a)print(b)输出"srting"srting ...
defis_Sublist(l,s):sub_set=Falseifs==[]:sub_set=Trueelifs==l:sub_set=Trueeliflen(s)>len(l):sub_set=Falseelse:foriinrange(len(l)):ifl[i]==s[0]...
<1>CharField#字符串字段,用于较短的字符串.#CharField要求必须有一个参数maxlength,用于从数据库层和Django校验层限制该字段所允许的最大字符数.<2>IntegerField#用于保存一个整数.<3>FloatFiel...
fromrandomimportshufflecolor=['1','2','3','4','5']shuffle(color)print(color) ...
importrandomprint(random.choice('abcdefghijklm')) ...
#Initializeacomplexnumbercn=complex(2,3)print("ComplexNumber:",cn)print("ComplexNumber-Realpart:",cn.real)print("ComplexNumber-Imaginarypart:",c...
importrandomnums=[1,2,3,4,5,6,7]random.shuffle(nums)print(nums) ...
fromfractionsimportFractionvalue=4.2print(Fraction(value).limit_denominator()) ...
importmathprint(math.fabs(-2.1))print(math.fabs(-0.0))print(math.fabs(10.1))print(math.fabs(0.0)) ...
print("Additionoftwocomplexnumbers:",(4+3j)+(3-7j))print("Subtractionoftwocomplexnumbers:",(4+3j)-(3-7j))print("Multiplicationoftwocomplexnumber...
版权申明：本文为博主窗户(Colin Cai)原创，欢迎转帖。如要转贴，必须注明原文网址 http://www.cnblogs.com/Colin-Cai/p/7899171.html 作者：窗户 QQ：6679072 E-mail：6679072@qq.com bp神经网络为大家所熟知，推导中使用了基于梯度下降。而对于更为一般的情况，解决问题的出发点是建立一组函数fi(Ci,Xi), i=1..n，n为输出的个数，也就是函数的个数，对于每个fi，Ci是一个参数向量，Xi是一个输入向量，我们的目标就是为这组函数中的每个fi找到最合适的Ci。 ...
