python常见代码题

野性酷女 2022-08-29 09:56 4阅读 0赞

1.  写出斐波那契数列的前20位

list1=[]
    for i in range(20):
        if i <= 1:
            list1.append(i)
        else:
            list1.append(list1[-1]+list1[-2])
    print(list1) 
    #[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181]

1.  写出九九乘法表

for i in range(1,10):
        for j in range(1,i+1):
            print(f'{ j}*{ i}={ j*i}\t',end='')
        print()

1.  list2=\[12,98,-3,196,77,103\]，从小到大冒泡排序

list2=[12,98,-3,196,77,103]
     for i in range(len(list2)-1):    #控制比几轮
        for j in range(len(list2)-1-i):   #控制每轮比几次
            if list2[j]>list2[j+1]:
               list2[j],list2[j+1]=list2[j+1],list2[j]    #两数互换
    print(list2)
    #[-3, 12, 77, 98, 103, 196]

1.  冒泡算法优化

for i in range(len(list2)-1):
        flag = False
        for j in range(len(list2)-i-1):
            if list2[j]>list2[j+1]:
                list2[j],list2[j+1]=list2[j+1],list2[j]
                flag = True
        if not flag:
            print(list2)
            break

1.  递归计算5的阶乘

def fun(n):
        if n<=1:
            return 1
        else:
            return n*fun(n-1)
    print(fun(5))  
    #120

1.  计算100-999以内的质数

list3=[]
    for i in range(100,1000):
       for j in range(2,i):
           if i % j == 0:
               break
       else:
           list3.append(i)
    print(list3)
    #[101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997]

1.  有N个台阶，每次只能走1或2步，共有多少种方法能爬完台阶？

#本质上是斐波那契数列
    def fun(n):
       if n<=2:
           return n
       else:
           return fun(n-1)+fun(n-2)
    print(fun(10))

1.  判断字符串是否为对称字符串

str1 = input('请输入字符串：')
    list1 = list(str1)
    for i in range(int(len(list1)/2)):
        if list1[i] != list1[-i-1]:
            print(f'字符串：{ str1}是不对称的')
            break
    else:
        print(f'字符串：{ str1}是对称的')

1.  求最大公约数和最小公倍数

def fun(a,b):
        if a>b:
            smaller = b
        else:
            smaller = a
        for i in range(1,smaller+1):
            if (a % i == 0) and (b % i == 0):
                res1 = i
        res2 = int(a * b / res1)
        print(f'{ a}和{ b}的最大公约数为{ res1},最小公倍数为{ res2}')
    fun(12,30) 
    #12和30的最大公约数为6,最小公倍数为60

1.  输出1000以内的水仙花数

list1=[]
    for i in range(100,1000):
       a = i//100
       b = i//10%10
       c = i%10
       if a**3+b**3+c**3==i:
           list1.append(i)
    print(list1)
    # [153, 370, 371, 407]