3.2
names['ljy','lcz','lk','lyj','lzc','lzy','lyf'] for people in names: print(people+" hello my friend")
3.4-3.7
guest=['zhugeliang','lishiming','zhuyuanzhang'] for people in guest: print(people.title()+" please come my party to have a dinner together") print(guest[0]+" can not come tonight") guest[0]='caocao' for people in guest: print(people.title()+" please come my party to have a dinner together") print("I find a larger table,so we can invite more people") guest.insert(0,'liuche') guest.insert(2,'chengjisihan') guest.append('huangtaiji') for people in guest: print(people.title()+" please come my party to have a dinner together") print("My table can not arrive in time,so i can just invite two people") poped=[0,1,2,0] for people in poped: cant_come=guest.pop(people) print(cant_come+" I'm sorry but i cann't invite you because the table can not arrive in time") for people in guest: print(people.title()+" please come my party to have a dinner together") del guest[0] del guest[0] print(guest)
3.8
place=['Haerbin','Paris','Hongkong','Beijing','Newyork'] print(place) print (sorted(place)) print(place) print (sorted(place,reverse=True)) print(place) place.reverse() print(place) place.reverse() print(place) place.sort() print(place) place.sort() print(place)
3.11
place=['Haerbin','Paris','Hongkong','Beijing','Newyork'] print(place[0]) print(place[6]) print(place[-6])
4.2
animals=['cat','dog','tiger'] for animal in animals: print(animal) print('A '+animals[0]+" is very cute") print('A '+animals[1]+" is loyal to human") print('A '+animals[2]+" is very violent") for animal in animals: print('A '+animal+" has a tail")4.5
print(min(number)) print(max(number)) print(sum(number))
用python将1-1000000相加需0.1s
4.8-4.9cubes=[value**3 for value in range(1,11)] for cube in cubes: print(cube)4.10
number=list(range(1,1000001)) print("The first three items in the list are:") print(number[:3]) print("Three items from the middle of the list are:") print(number[499998:500001]) print("The last three items in the list are:") print(number[-3:])
4.13
foods={'rice','noodles','chicken','beef','salad'} for food in foods: print(food) foods[0]="pork" foods_n={'egg','potato','chicken','beef','salad'} for food in foods_n: print(food)