python基础练习题6

01：求1+2！+3！+....+20!的和

s=0
t=1
for n in range(1,21):
    t*=n
    s+=t
print('1!+2!+3!+.....+20!=%d'%s)

02：利用递归函数调用方式，将所有输入的5个字符，以相反顺序打印出来

def palin(n):
    next=0
    if n<=1:
        next=input()
        print()
        print(next)
    else:
        next=input()
        palin(n-1)
        print(next)
i=5
palin(i)
print()

03：给一个不多于5的正整数，要求：一，求它是几位数，二，逆序打印出各位数字

num = int(input('input a number：'))

a=num//10000%10
b=num//1000%10
c=num//100%10
d = num//10%10
e= num%10
a=num/10000
b=num%10000/1000
c=num%1000/100
d=num%100/10
e=num%10
if a!=0:
    print('there are 5',e ,d ,c,b,a)
elif b!=0:
    print('there are 4',d ,c,b,a)
elif c!=0:
    print('there are 3', e, d, c)
elif d!=0:
    print('there are 2',  e, d)
else:
    print('there are 1',  e)

#第二种方法
num =input('输入一个不超过5位的正整数：')
l=len(num)
print('这个数是',l,'位数')
n=num[::-1] #通过索引切片，逆序打印出数字
for i in n:
    print(i)

04：一个5位数，判断它是不是回文数，即123321是回文数，个位和万位相同，十位与千位相同

a = input("输入一串数字: ")
b = a[::-1]
if a == b:
    print("%s 是回文"% a)
else:
    print("%s 不是回文"% a)

Num = input('please input a number:')
if Num[:] == Num[::-1]:
      print('True')
else:
       print('False')

05：请输入星期几的第一个字母来判断一下是星期几，如果第一个字母一样，则继续判断第二个字母

#
letter = input("please input:")

# while letter  != 'Y':
if letter == 'S':
    print('please input second letter:')
    letter = input("please input:")

    if letter == 'a':
        print('Saturday')
    elif letter == 'u':
        print('Sunday')
    else:
        print('data error')

elif letter == 'F':
    print('Friday')

elif letter == 'M':
    print('Monday')

elif letter == 'T':
    print('please input second letter')
    letter = input("please input:")

    if letter == 'u':
        print('Tuesday')
    elif letter == 'h':
        print('Thursday')
    else:
        print('data error')

elif letter == 'W':
    print('Wednesday')
else:
    print('data error')

06：求100以内的素数

num=[]
i=2
for i in range(2,100):
    for j in range(2,i):
        if i%j==0:
            break
    else:
        num.append(i)
print(num)

07：对10个数进行排序

list=[]
for i in range(10):
    a = input('请输入整数：')
    list.append(a)
print(list)
list.sort()
print(list)

list=[]
for i in range(10):
    print('输入第%d个整数'%i)
    a=input()
    list.append(a)
print(list)

for i in  range(9):
    min_index=i
    for j in range(i+1,10):
        if list[j]<list[min_index]:
          list[min_index],list[j]=list[j],list[min_index]
    print(list)