day13 考试练习

1，有两个列表
l1 =  [11,22,33]
l2 =  [22,33,44]
a.  获取内容相同的元素列表
b.  获取 l1  中有， l2 中没有的元素列表
c.  获取 l2  中有， l1 中没有的元素列表
d.  获取 l1  和 l2   中内容都不同的元素

a,获取内容相同的元素列表
l1    =    [11,22,33]
l2    =    [22,33,44]
for i in l2:
    if i  in l1:
        print(i)

结果：
22
33

l1  =  [11,22,33]
l2 =  [22,33,44]
for i in l1:
    if i not in l2:
        print(i)

结果：
11

l1    =    [11,22,33]
l2    =    [22,33,44]
for i in l2:
    if i not in l1:
        print(i)

结果：
44

l1    =    [11,22,33]
l2    =    [22,33,44]
for i in l2:
    if i not in l1:
        print(i)
for i in l1:
    if i not in l2:
        print(i)

结果：
44
11

17，有1 2 3 4 5 6 7 8 8个数字，能组成多少个互不相同且无重复数字的两位数？

count =0
for i in range(1, 9):
    for v in range(1, 9):
        if i !=v:
            count += 1
print(count)

18、99乘法表

for i in range(1,10):
    string = ""
    for j in range(1,i+1):
        string +=str(j) + " * "+str(i) + " = " +str(i*j)+"	"
    print(string)

20 用python 开发程序自动计算方案

公鸡5文钱一只，母鸡3文钱一只，小鸡3只一文钱，用100文钱买100只鸡，其中公鸡，母鸡，小鸡都必须要有，文公鸡，母鸡，小鸡要买多少只刚好凑足100文钱

for x in range(1,100//5):
    for y in range(1,100//3):
        for z in range(1,100):
            if x + y + z == 100 and 5*x + 3*y + z/3 == 100:
                print(x,y,z)

1，请用代码实现：利用下划线将列表的每一个元素拼接成字符串，

li = ['alex','eric','rain']

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


alex_eric_rain

5,写代码，有如下元组，按照要求实现每一个功能

tu = ('alex','eric','rain')

a,计算元组长度并输出

b，获取元组的第2个元素，并输出

tu = ('alex', 'eric', 'rain')
# print(len(tu))
# print(tu[2])
# print(tu[1:])
# #step 为正
# print(tu[1:90])
# for elem in tu:
#     print(elem)
# for idx in range(len(tu)):
#     print(idx)

# for idx, elem in enumerate(tu, 10):     enumerate
#     print(idx, elem)

tu =(
     "alex",     [         11,         22,         {             "k1":'v1',             "k2":["age","name"],             "k3":(11,22,33)         },         44     ] ) tu[1][2]["k2"].append("")

12,

19题

nums = [2,7,11,15,1,8,7]
a =[]
for i in range(len(nums)):
    for j in range(len(nums)):
        if nums[i] + nums[j] ==9:
            a.append((i,j,))
print(a)

3，

li = ["sdsdsd"]
print (len(li))
li.append("dsad")
li.insert(0,"dsad")
li.remove("eric")
v = li.pop(1)
print(li,v)

v = li.reverse()
for i in range(len(li)):
    print(i)
for i,q in enumerate(li,100):
    print(i,q)
for i in li:
    print(i)

16，

user_list = [
]
for i in range(1,302):
    temp = {'name': 'alex'+str(i), 'email': 'alex@lve.com' + str(i), 'pwd': 'pwd'+str(i)}
    user_list.append(temp)

while True:
    # 每页显示10条数据
    s = input("请输入1,2,3-31页码：")
    s = int(s)
    # user_list[0,10]  1
    # user_list[10,20]  2
    # user_list[20,30]  3
    start = (s-1) * 10
    end = s * 10
    result = user_list[start: end]
    for item in result:
        print(item,type(item))