python day04 作业答案

1.

1）

li=['alex','WuSir','ritian','barry','wenzhou']
print(len(li))

2）

li=['alex','WuSir','ritian','barry','wenzhou']
li.append('seven')
print(li)

3）

li=['alex','WuSir','ritian','barry','wenzhou']
li.insert(1,'Tony')
print(li)

4）

li=['alex','WuSir','ritian','barry','wenzhou']
li[2]='Kelly'
print(li)

5）

li=['alex','WuSir','ritian','barry','wenzhou']
li2=[1,'a',3,4,'heart']
li.extend(li2)
print(li)

6)

li=['alex','WuSir','ritian','barry','wenzhou']
li2='qwert'
li.extend(li2)
print(li)

7)

li=['alex','WuSir','ritian','barry','wenzhou']
li.remove('alex')
print(li)

8)

li=['alex','WuSir','ritian','barry','wenzhou']
a=li.pop(2)
print(li)
print(a)

9)

li=['alex','WuSir','ritian','barry','wenzhou']
del li[2:4]
print(li)

10)

li=['alex','WuSir','ritian','barry','wenzhou']
a=[]
li2=li[::-1]
a.extend(li2)
print(a)

11)

li=['alex','WuSir','ritian','barry','wenzhou']
a=li.count('alex')
print(a)

2.

1)

li=[1,3,2,'a',4,'b',5,'c']
l1=li[0:3]
print(l1)

2）

li=[1,3,2,'a',4,'b',5,'c']
l1=li[3:6]
print(l1)

3）

li=[1,3,2,'a',4,'b',5,'c']
l1=li[0::2]
print(l1)

4）

li=[1,3,2,'a',4,'b',5,'c']
l1=li[1:-2:2]
print(l1)

5）

li=[1,3,2,'a',4,'b',5,'c']
l1=li[-1]
print(l1)

6）

li=[1,3,2,'a',4,'b',5,'c']
l1=li[-3:0:-2]
print(l1)

3.

1）

li=[2,3,'k',['qwe',20,['k1',['tt',3,'1']],89],'ab','adv']
li[3][2][1][0]='TT'
lis[3][2][1][0] = lis[3][2][1][0].replace("t", "T")
print(li)

 2）

li=[2,3,'k',['qwe',20,['k1',['tt',3,'1']],89],'ab','adv']
li[3][2][1][1]=100
li[1]=100
li[3][2][1][1] = str(li[3][2][1][1]+97)
print(li)

3）

li=[2,3,'k',['qwe',20,['k1',['tt',3,'1']],89],'ab','adv']
li[3][2][1][2]=101
li[3][2][1][1] = str(int(li[3][2][1][2])+100)
print(li)

4.

1）

li=['alex','eric','rain']
li1=''
for i in li:
    li1=li1+i+'_'
print(li1[0:-1])

5.

li = ["alex", "WuSir", "ritian", "barry", "wenzhou", ""]
for i in range(0,len(li)):
    print(i)

6.

lst=[]
for i in range(0,101):
    if i %2 ==0:
        lst.append(str(i))
print(lst)

7.

lst=[]
for i in range(0,51):
    if i %3 ==0:
        lst.append(str(i))
print(lst)

8.

for i in range(100,0,-1):
    print(i)

9.

a=[]
b=[]
for i in range(100,9,-1):
    if i %2==0:
        a.append(i)
for num in a:
    if num %4 ==0:
        b.append(num)
print(b)

 10.

a=[]
b=[]
for i in  range(1,31):
    a.append(i)
for j in a :
    if j %3==0:
        j='*'
    b.append(j)
print(b)

11.

a=[]
li=['TaiBai,','xC','AbC','egon','TiAn','WuSir','aqc']
for i in li :
    i.replace(' ','')
    if (i.startswith('a') or i.startswith('A')) and i.endswith('c'):
        a.append(i)
print(a)

12.

a=input('输入：')
b=''
c=[]
li=['苍老师','东京热','武藤兰','波多野结衣']
for j in li :
    if str(j) in a :
        a=a.replace(str(j),('*'*len(j)))
c.append(a)
print(c)

13.

a=[]
for i in li :
    if type(i)!=list:
        a.append(i)
    else:
        a.extend(i)
for j in a :
    print(j)

14.

d=0
c=[]
while 1 :
    a=input('输入：')
    if a.lower() !='q':
        e=a.split('_')
        c.append(a)
        d=d+int(e[1])
    else:
        break
print(d/len(c))