Python练习题目2

1、代码

li = ["alex","eric","rain"]line = "_".join(li)print(line)

2、代码

#!/usr/bin/python# -*- coding:utf-8 -*-li = ["alec","aric","Alex","Tony","rain"]tu = ("alec","aric","Alex","Tony","rain")dic = {"k1":"alex","k2":"aric","k3":"Alex","k4":"Tony"}for item in li:    item = item.strip()    if (item.startswith("a") or item.startswith("A") )  and item.endswith("c"):        print(item)for item in tu:    item = item.strip()    if (item.startswith("a") or item.startswith("A") )  and item.endswith("c"):        print(item)for value in dic.values():    value = value.strip()    if (value.startswith("a") or value.startswith("A") )  and value.endswith("c"):        print(value)

3、代码

li = ["alex","eric","rain"]print(len(li))li.append("seven")li.insert(0,"Tony")li[1] = "Ke"li.remove("eric")del li[1]del li[2]del li[1:3]li.reverse()for i in range(0,len(li)-1):    print(i,li[i])for key,value in enumerate(li,100):    print(key,value)for item in li:    print(item)

4、代码

li = ["hello","seven",["mon",["h","kelly"],"all"],123,446]print(li[2][1][1])li[2][2] = "All"print(li)

5、代码

tu = ("alex","eric","rain")print(len(tu))print(tu[1])print(tu[0:2])for item in tu:    print(item)for i in range(0,len(tu)-1):    print(i)for key,item in enumerate(tu,10):    print(key,item)

6、代码

tu = ("alex",[11,22,{"k1":"v1","k2":["age","name"],"k3":(11,22,33)},44])print("元组是一个特殊的列表,不支持增删改操作,仅支持查看操作")print("不可以被更改")tu[1][2]["k2"].append("Seven")print(tu)print("不可以")

7、

#!/usr/bin/python# -*- coding:utf-8 -*-dic = {"k1": "v1", "k2": "v2", "k3": [11,22,33]}for key in dic:    print(key)for value in dic:    print(value)for key,value in dic.items():    print(key,value)dic.setdefault("k4","v4")print(dic)dic["k1"] = "alex"print(dic)dic["k3"].append(44)print(dic)dic["k3"].insert(0,18)print(dic)

8、

s = "alex"user_list1 = []for i in s:    user_list1.append(i)print(user_list1)

9、

    #!/usr/bin/python    # -*- coding:utf-8 -*-    v1 = [11,22,33,44,55,66,77,88,99,90]    k1_list = []    k2_list = []    for i in v1:        if i < 66:            k1_list.append(i)        else:            k2_list.append(i)    v2 = {}    v2["k1"] = k2_list    v2["k2"] = k1_list    for item in v2.items():        print item

10、

li = ["手机","电脑","鼠标垫","游艇"]good_label = input("请输入需要添加的商品:")li.append(good_label)for key,item in enumerate(li):    print(key+1,item)num = int(input("请输入相应的序号:"))print(li[num-1])

11、
12、

print("一般空的内容都是False")line = ""if line:    print("111111")else:    print("22222")user_info = []if user_info:    print("11111")else:    print("2222")print("真用1表示,假用0表示")value = 0if value:    print("11111")else:    print("2222")

13、

intersection\difference\difference\symmetric_difference

16、

f1 = open("db","w")for i in range(1,101):    temp = "alex-%s"%(i)+"\t"+"[e-mail]"%(i)+"\t"+"pwd%s\n"%i    f1.write(temp.expandtabs(10))f1.close()f2 = open("db","r")data = f2.read()f2.close()user_list = data.split("\n")user_info_list = []for item in user_list:    user_info_list.append(item)page_num = int(input("您好,请输入查看的商品列表页码:"))if page_num <= len(user_info_list):    start = (page_num - 1) * 10    end = page_num * 10    v1 = user_info_list[start:end]    for item in v1:        print(item)

18、

for i in range(1,10):    for  j in range(1,10):        if j<=i:            sum = i * j            print("%d*%d=%d\t"%(i,j,sum),end="")        else:            print("\n")            break