服工-实训八

第一题:

s = input()

space = 0

letter = 0

other = 0

digit = 0

for c in s:

    if c.isalpha():

        letter+=1

    elif c.isspace():

        space+=1

    elif c.isdigit():

        digit+=1

    else:

        other+=1

print(letter,space,digit,other,sep=' ')

第二题:

s = list(map(int,input().split()))

s.sort()

N=s[0]

M=s[1]

while True:

    if M%N==0:

        break

    else:

        temp = N

        N = M%N

        M = temp

r1 = N

M=s[1]

while True:

    if M%s[1]==0 and M%s[0]==0:

        break

    M+=1

r2 = M

print('{} {}'.format(r1,r2))

思考:M+=1的位置 放上面错误!!会丢失一种情况

辗转相除法求最大公约数

第三题:循环嵌套 注意range()前闭后开

n = int(input())

s = 0

for i in range(1,n+1,2):

    temp = 1

    for j in range(1,i+1):

        temp *= j

    s = s+temp

print('n={:},s={:}'.format(n,s))

    

第四题:一个数同时满足上诉条件

p = 1

while True:

    a1 = p%5

    a2 = p%6

    a3 = p%7

    a4 = p%11

    if a1==1 and a2==5 and a3==4 and a4==10:

        break

    p+=1

print(p)

第五题:

import random

a,n = map(int,input().split())

random.seed(a)

i = 0

while i < n:

    x = random.randint(1,9)

    y = random.randint(1,9)

    print('{}+{}='.format(x,y))

    i+=1

第六题:

import random

x,n = map(int,input().split())

random.seed(x)

count = 1

for i in range(n):

    s = []

    for j in range(23):

        s.append(random.randint(1,365))

    s.sort()

    flag = False

    for i in range(1,len(s)):

        if s[i-1]==s[i]:

            flag = True

            break

    if flag:

        count+=1

print('rate={:.2f}'.format(count/n))

思考:flag的作用! 审题清楚 判断是否由重复生日 一个就够了

方法二:利用count()方法判断

import random

x,n = map(int,input().split())

random.seed(x)

count = 0

for i in range(n):

    s = []

    for j in range(23):

        s.append(random.randint(1,365))

    for j in s:

        if s.count(j)>1:

            count+=1

            break

print('rate={:.2f}'.format(count/n))

第七题:

n = int(input())

try:

    s = []

    for i in range(n):

        s.append(float(input()))

    avg = sum(s)/n

    print('正确')

    print('avg={:.2f}'.format(avg))

except ZeroDivisionError:

    print('除0错误，n不能等0')

except:

    print('数值错误')

finally:

    print('程序结束')

思考:恶心 英文的逗号

第八题:

s = input()

try:

    n = int(input())

    print(s[n])

except:

    print('输入下标有误')

思考:有问题的都要放在try里面  比如说n的int

第九题:待解决 错误,请看方式二

import random

n = int(input())

s = 1

t = []

for i in range(1,n+1):

    s*=i

    t.append(str(i))

rate = []

result = []

for i in range(s):

    result = result + [''.join(t)]

    rate.extend(t)

    while True:

        random.seed()

        random.shuffle(t)

        for j in range(0,len(rate)-2,3):

            flag = False

            if rate[j:j+2] == t:

                break

            flag = True

        if flag:

            break

print('\n'.join(result))

                

方法二: 利用 not in

import random

n = int(input())

s = 1

t = []

for i in range(1,n+1):

    s*=i

    t.append(str(i))

result = [''.join(t)]

for i in range(s-1):

    while True:

        random.shuffle(t)

        a = ''.join(t)

        if a not in result:

            break

    result = result + [a]

result.sort()

print('\n'.join(result))

思考:range(s-1)一开始已经添加过元素了!!!

第十题:

n = int(input())

for i in range(1,n+1):

    for j in range(i):

        print(chr(65+j),end='')

    print()

第十一题:

n = int(input())

for i in range(1,n+1):

    id1 = i

    s = []

    for j in range(n-i+1):

        s.append(id1)

        id1 = id1+(n-j)

    temp=''

    for j in s:

        temp=temp+'{: <3}'.format(j)

    print(temp.strip())

复杂:错误

n = int(input())

Max = 0

for i in range(1,n+1):

    id1 = i

    s = []

    for j in range(n-i+1):

        s.append(id1)

        id1 = id1+(5-j)

    temp=''

    if id1 > Max:

        Max = id1-1

    for j in s:

        length = len(str(Max))+1

        temp=temp+'{: <{:}}'.format(j,length)

    print(temp.strip())

第十二题:

error = float(input())

i = 1

e1 = i

while True:

    s = 1

    for j in range(1,i+1):

        s*=j

    e1 = e1 + 1/s

    i+=1

    if 1/s<error:

        print(round(e1,6))

        break

关键词：服工实训八、Python