python day 03作业答案

1.

(10)

name='aleX leNb'
print(name.split('l',1))

(13)

name='aleX leNb'
a=name.replace('a','A')
print(a)

(14)

name='aleX leNb'
count=0
for i in  name:
    if i =='l':
        count+=1
print(count)

（15）

name='aleX leNb'
count=0
for i in  name[0:4]:
    if i =='l':
        count+=1
print(count)

（16）

name='aleX leNb'
print(name.index('N'))

（17）

name='aleX leNb'
print(name.find('N'))

 

2.

（6）

s='123a4b5c'
print(s[-3::-2])

3.

s='123a4b5c'
for i in  s :
    print(i)

4.

s='123a4b5c'
for i in  range(0,len(s)) :
    print(s+'sb')

 5.

s='abcdefg'
for i in s:
    print(str(i)+'sb')

6.

s='321'
for i in s:
    print('倒计时%s秒' %i)

7.

count=input('请输入内容：').strip()
a=count.split('+')
b=int(a[0])+int(a[1])
print(b)

8.

count=input('请输入内容：').strip()
a=count.split('+')
b=0
for i in range(0,len(a)):
    b=b+int(a[i])
print(b)

9.

count=input('请输入内容：').strip()
a=0
for i in  count:
    if i.isdigit():
        a=a+1
print(a)

10.

a=input('请输入：').upper()
while 1:
    if a=='A':
        print('走大路回家')
        b=input('公交车还是步行？')
        if b=='公交车':
            print('十分钟到家')
            break
        elif b=='步行':
            print('20分钟回家')
            break
    elif a=='B':
        print('走小路回家')
        break
    elif a=='C':
        print('绕道回家')
        c=input('游戏厅还是网吧？')
        if c=='游戏厅':
            print('你爸爸会打死你，给我重新选A,B,C')
        elif c=='网吧':
            print('你妈会打死你，给我重新选A,B,C')
        else:print('傻逼')

11.

count=0
sum=0
while count <99:
    count = count + 1
    if count==88:
        continue
    if count %2!=0:
        sum=sum+count
    elif count %2==0:
        sum=sum-count
print(sum)

12.

a=input('')
if a[-1::-1]==a:
    print('回文')

13.

a=input('')
digit_num = 0
upper_num=0
lower_num=0
for i in a:
    if i.isdigit():
        digit_num+=1
    elif i.isupper():
        upper_num+=1
    elif i.islower():
        lower_num+=1
print(digit_num)
print(upper_num)
print(lower_num)

14.

name=input('姓名')
place=input('地点')
hobby=input('爱好')
print('敬爱的{}喜欢在{}{}'.format(name,place,hobby))