Python第三章课后作业

3-1姓名：

names=['lmd','ksb','kq','lrp']
for name in names:
	print(name)

执行结果：

3-2问候语：

names=['lmd','ksb','kq','lrp']
for name in names:
	print(name.title()+" Hi!")

执行结果：

3-3自己的列表：

ways=['motorcycle','bicycle','walk']
print('I like red '+ways[0])
print('I want to ride a '+ways[1])
print('I would like to '+ways[-1])

执行结果：

3-4嘉宾名称：

people=[]
people.append('ksb')
people.append('lmd')
people.append('kq')
people.append('lrp')
for person in people:
	print(person+', please come to have dinner')

执行结果：

3-5修改嘉宾名单：

people=[]
people.append('ksb')
people.append('lmd')
people.append('kq')
people.append('lrp')
for person in people:
	print(person+', please come to have dinner')
print("\nksb can't come to the dinner\n")
for i in range(0,len(people)):
	if(people[i]=='ksb'):
		people[i]='zzy'
	print(people[i]+', please come to have dinner')

运行结果：

3-6添加嘉宾：

people=[]
people.append('ksb')
people.append('lmd')
people.append('kq')
people.append('lrp')
for person in people:
	print(person+', please come to have dinner')
print("\nksb can't come to the dinner\n")
for i in range(0,len(people)):
	if(people[i]=='ksb'):
		people[i]='zzy'
	print(people[i]+', please come to have dinner')
print("I have a bigger table")
people.insert(0,'llq')
people.insert(3,'hzp')
people.insert(len(people),'hyk')
print(people)

运行结果：

3-7修改名单：

print('I can only invite 2 person to my dinner')
while len(people)>2:
	print(people[-1]+", I am so sorry that you can't come to my dinner")
	people.pop()
for x in people:
	print(x+', you are still invited')
del people[0]
del people[0]
print(people)

运行结果：

3-8放眼世界：

places=['china','america','russia','japan','france']
print(places)
print(sorted(places))
print(places)
print(sorted(places,reverse=True))
print(places)
places.reverse()
print(places)
places.reverse()
print(places)
places.sort()
print(places)
places.sort(reverse=True)
print(places)

运行结果：

3-9晚餐嘉宾：

print('\nI have invited '+str(len(people))+' people')

运行结果：

3-10尝试使用各个函数：

#列表（即数组）
arr=['blue',"red",'yellow']#单引号和双引号作用一样
print(arr[0])
print(arr[1])
print(arr[-1]) #访问最后一个元素

arr.append('black');  print(arr)
arr.insert(1,'orange');	print(arr)
del arr[1];		print(arr)
tmp=arr.pop(1);#可以pop出任意位置的元素，没指定就默认最后一个
print(arr);	print(tmp)

arr.remove('yellow')#按值删除
print(arr)

print("*******************************")
#排序
arr.append("red")
arr.append('yellow')
print(arr)
arr.sort()#顺序排
print(arr)

arr=["asf","jic","kisnf","jsafw"]
#永久性排序
arr.sort(reverse=True)#倒序排
print(arr)

#暂时排序
arr=['f','a','c','v','w']
print(sorted(arr,reverse=True))#暂时倒序排
print(arr)

arr.reverse()#倒序
print(arr)
print("length is "+str(len(arr)))

#遍历列表
for item in arr:
	print(item,end=",")
print("\n")

运行结果：

3-11有意引发错误：

arr=['aaa','jij','vac']
print(arr[3])

运行结果：

改正：

arr=['aaa','jij','vac']
print(arr[2])

运行结果：