python 入门到实践第三章课后练习

"""3-4练习"""
guestname = ["alex","crystal","eric","toto","bingo"]
message = " i want Dinner together for you"
print(guestname)
print("hi" + " " + guestname[0].title() +","+ message+".")
print("hi" + " " + guestname[1].title() + ","+message+".")
print("hi" + " " + guestname[4].title() +","+ message+".")
'''3-5练习'''
print(guestname[4] +" "+ "not come on.")
guestname[4] = "joner"#修改第四个元素
print(guestname)
print("hi" + " " + guestname[0].title() +","+ message+".")
print("hi" + " " + guestname[1].title() + ","+message+".")
print("hi" + " " + guestname[4].title() +","+ message+".")
'''3-6练习'''
print("我找到一个更大的饭店，可以邀请更多的宾客")
guestname.append("hanmei")#末尾添加元素
guestname.insert(0,"lisi")#列表开头添加元素
guestname.insert(3,"wangwu")#在列表第三个索引添加元素
print(guestname[0].title() + " " + message)
print(guestname[1].title() + " " + message)
print(guestname[2].title() + " " + message)
print(guestname[3].title() + " " + message)
'''3-7练习'''
print("抱歉我只能要求两位来宾了")
newguest=guestname.pop()#删除元素并把值赋给newgues这个变量
print(newguest.title()+" 抱歉不能邀请您")
print(guestname)
newguest=guestname.pop()
print(newguest.title()+" 抱歉不能邀请您")
print(guestname)
newguest=guestname.pop()
print(newguest.title()+" 抱歉不能邀请您")
print(guestname)
newguest=guestname.pop()
print(newguest.title()+" 抱歉不能邀请您")
print(guestname)
newguest=guestname.pop()
print(newguest.title()+" 抱歉不能邀请您")
print(guestname)
newguest=guestname.pop()
print(newguest.title()+" 抱歉不能邀请您")
print(guestname)
print(guestname[0].title()+ " " + message)
print(guestname[1].title()+  " " + message)
del guestname[0] #删除列表开头元素
del guestname[0]#2个元素因为第一个元素删除后前移了，所有这里应该写【0】 而不是【1】
print(guestname)

toti=len(guestname)
print(toti)

'''3-8'''
word = ["china","usa","tailand","HK","taiwan","ahpach"]
print(word)
word[3] = word[3].lower()#将列表中第4个元素转换为小写
print(sorted(word))#临时排序
print(sorted(word,reverse=True))#临时排序降序
word.reverse()#列表顺序调换
print(word)
word.reverse()#列表顺序调换
print(word)
word.sort()#列表永久排序
print(word)
word.sort(reverse=True)#列表永久排序降序
print(word)
toti=len(word)#查询确定列表的长度
print(toti)