python学习笔记 Day2

1.鸡汤咕嘟咕嘟~

　Be a new gentleman

   外在美：

   老师说买衣服要多去优衣库，简洁大方还提供办事的试衣间！！真棒！！

   某些国产大牌，外国地摊货（饥渴穷死啥的）就算了吧。

　内在美：

   多去旅行，多看书

   学好英语，保持正能量

   换位思考，积极影响身边的人

　多看电影

2.import一个py程序

 

auth.py 代码如下：
1 user = input("user:")
print(user)

 

import_auth.py 代码如下：
1 import auth

    这样运行两个py程序都是一样的效果！

3.找出一个列表中的某个元素，并且把它修改成新的值。

name = [1,2,34,34,9,8,7,9,6,9,3,34,9,10]

count = name.count(9)
for i in range(count):
    count = name.count(9)
    print("there are %d in name" % count)
    print(name)
    name[name.index(9)] = 9999
print(name)

 4.while loop类代码

count=0
while True:
    count = count + 1
    if 60 > count > 50:
        continue
    print("%04d,-------"%count)

    if count == 100:
        print("||||||||||||")
        break

5.列表的操作

   练习题：

#写一个列表，包含本组所有成员
#往中间插入两个临组成员名字
#取出第3-8的人列表
#删除第七个人
#把刚才加入的那2个其他组的人一次性删除
#把组长的名字加上组长备注
#要求隔一个人打印一个人

list2 = ["2-1","2-2","2-3","2-4","2-5","2-6","2-7","2-8"]
list3 = ["3-1","3-2"]

for i in list3:

    list2.insert(4,i)

print(list2)
print(list2[2:8])

print(list2[6])
list2.remove(list2[6])
print(list2)

del list2[4:6]
print (list2)

list2[list2.index("2-1")] = list2[list2.index("2-1")] + "组长"
print(list2)

print(list2[0::2])

   列表的其他用法

name = "1,2,3"
name2 = name.split(',')
name3 = "|".join(name)
#print(name2)
print("|".join(name2))

name = "lu shuai"
print(name[2:4])
print(name.center(20,'-'))

print(name.find('s'))

age = input("your name:")
if age.isdigit():
    age = int(age)

name='lussys'
print(name.isalnum())
print(name.endswith('ys'))
print(name.startswith('lu'))
print(name.upper().lower())

6.字典的练习

name = [1,2,3,4,5,6]

id_db = {
    19990101:{
        'name':"lus",
        'age':22,
        'add':"Hebei"
    },
    19990102:{
        'name':"luu",
        'age':22,
        'add':"Shanxi"
    },
    19990103:{
        'name':"lul",
        'age':22,
        'add':"Beijing"
    }
}

print(id_db)

print (id_db[19990102])
id_db[19990102]['name'] = "newname"
print (id_db[19990102])
id_db[19990102]['new'] = "newnew"
print (id_db[19990102])
id_db[19990102].pop("add")
print (id_db[19990102])

v = id_db.get(19990102)
#v = id_db[19990102]
print(v)

dic2 = {
    'name':'test',
    19990102: {
        'name':"dic2",
    },
}

id_db.update(dic2)
print(id_db)
print(id_db.items())
print(id_db.keys())
print(id_db.values())
#19990102 in id_db  判断这个key 是否在id_db中
print(id_db.setdefault(19990105,"hahaha"))
print(id_db)

for key in id_db:
    print(key,id_db[key])

 7.课堂总结

1. 列表用法：

   copy
   reverse
   pop
   sort
   extend
   index
   count
   list[::2]
   del

2. 运算符

   % 取模  奇偶数判断
   ** 幂  a**b
   // 商的整数部分

3. 逻辑运算

   and   a > 1 and b > 1
   or
   not     if a is not in list: print
   is not     type(a) is list

4. 二进制运算

   <<  左移 
   >>  右移 

8.购物小程序

#用户启动时先输入财产
#用户启动程序后打印商品列表
#允许用户选择购买商品
#允许用户不断的购买各种商品
#购买时检测余额是否足够，如果足够直接付款，否则打印余额不足
#允许用户主动退出程序，退出时打印已购商品列表

salary = input("Input your salary:")
if salary.isdigit():
    salary = int(salary)
else:
    exit("the salary is not int type")

welcome_msg = "welcome to go shopping".center(50,'-')
print (welcome_msg)

exit_flag = False
product_list = [
    ('Iphone',5),
    ('Mac Air',8),
    ('Xiao Mi',9),
    ('Coffee',4),
    ('Bike',2),
    ('Cloth',3),]
shop_car = []

while exit_flag is not True:
    print("produce list".center(50,'-'))
    for item in enumerate(product_list):
        index = item[0]
        p_name = item[1][0]
        p_price = item [1][1]
        print(index,'.',p_name,p_price)

    user_choice = input("[q=quit,c=check]what do you want to buy?")
    if user_choice.isdigit():
        user_choice = int(user_choice)
        if user_choice < len(product_list):
            p_item = product_list[user_choice]
            if p_item[1] <= salary:
                shop_car.append(p_item)
                salary -= p_item[1]
                print("Added [%s] into shop car,you balance is \033[31;1m[%s]\033[31;0m" %
                      (p_item,salary))
            else:
                print("Your balance is [%s],cannot afford thie..." % salary)
    else:
        if user_choice == 'q' or user_choice == 'quit':
            print("purchased  products as below".center(40,'*'))
            for item in shop_car:
                print(item)
            print("END".center(40,'*'))
            print("Your balance is [%s]" % salary)
            print("Bye")
            exit_flag = True
        elif user_choice == 'c'  or  user_choice == 'check':
            print("purchased products as below".center(40,'*'))
            for item in shop_car:
                print(item)
            print("END".center(40,'*'))
            print("Your balance is \033[41;1m[%s]\033[0m" % salary )