python基础（八）

一、token加盐处理
# import itsdangerous
#
# salt='sdf234^#$@G'
# t = itsdangerous.TimedJSONWebSignatureSerializer(salt,expires_in=30)
# # res = t.dumps({'username':'yangfan','user_id':1})
# # token = res.decode()
# # print(token)
# s='eyJhbGciOiJIUzI1NiIsImlhdCI6MTU0MTgyMDA1NiwiZXhwIjoxNTQxODIwMDg2fQ.eyJ1c2VybmFtZSI6InlhbmdmYW4iLCJ1c2VyX2lkIjoxfQ.FUfs92HuVKrt61AKpMjv1Iye8QDP7XUGOfgcrSusMv8'
# res = t.loads(s)
# print(res)

import pymysql
coon = pymysql.connect()
cur= coon.cursor()
# sqls = ['sleect','uodate','delet','insert']
# for i in sqls:
#     cur.execute(i)

二、sys.argv的用法

import flask
import sys
import time
server = flask.Flask(__name__)

@server.route('/')
def index():
    return '<h1>success</h1>'
if len(sys.argv)>1:
    port = sys.argv[1]
    if port.isdigit():
        server.run(port=port)
    elif port=='--help':
        print('这个python文件的作用是让你发财！')
    elif port=='--time':
        print(time.strftime('%Y-%m-%d %H:%M:%S'))
    else:
        print('端口号必须是整数！')
else:
    print('运行错误！请在运行的时候指定端口号
'
          '请按照下面的方式运行python文件！
'
          'python mock_server.py 8989')




#sys.argv的作用是获取到运行python文件时，传入的参数
# python xxx.py --help
# 默认如果运行python文件的时候，不传参数，argv里面只有一个元素
#就是当前这个python文件的文件名
# python  xxx.py

三、glob模块的用法和Exception以及finally的用法

import os,glob
# print(os.listdir())
# for f in os.listdir():
#     if f.endswith('.py'):
#         os.remove(f)
print(glob.glob('*')

# print(d['abc'])
# s='a'
# print(int(s))
# print(10/0)i
# import pymysql
# coon = pymysql.connect(host='118.24.3.40',user='jxz',
#                 password='123456',db='jxz')
# cur= coon.cursor()
# cur.execute('select  from a;')
#
# for i in range(20):
#     print(i)

# try:
#     s = 10/0
# except ZeroDivisionError as e:
# # except ZeroDivisionError, e:  这个是python2里面的写法
#     print('走这里')
#     print(e)

def calc(a,b):
    try:
        res = a/b
    # except ZeroDivisionError as e:
    #     res = '除数不能为零, %s'%e
    # except TypeError as e:
    #     res = '类型错误,只能数字类型 %s'%e
    except Exception as e:
        print(e)
    # return res
# res = calc('k',1) #TypeError
# # calc(10,0)  # ZeroDivisionError
# res = calc(10,0) #TypeError


money = input('enter:')
try:
    money = int(money)
except Exception as e:#产生异常了，走这边
    print('输入金额错误！')
else:#没有出现异常的话就这里
    print(money+1)
finally:
    print('什么时候执行finally')

四、面向对象（定义类、self的用法、继承）

class People: #新式类
    eye = 2
    mouth = 1
    shengao = 180
    money=1000000
    def __init__(self,name):
        self.name = name
        #构造函数，类在初始化做的一些操作
        print('造了一个人，这个人是%s'%name)
    def cry(self):
        print('哭。。。')
    def makeMoney(self):
        print('self的内存地址',id(self))
        print('%s 挣了20w'%self.name )

xiaojun = People('小军') #实例化
# print('小军的内存地址',id(xiaojun))
xiaojun.makeMoney()
# People.makeMoney(xiaojun)

# hailong = People('海龙')
# print('海龙的内存地址',id(hailong))
# hailong.makeMoney()

class Car:
    def __init__(self,color,pl):
        self.color = color
        self.pl = pl
    def add_fun(self,fun):
        self.fun = fun
        print('颜色是%s'%self.color)
        print('排量是%s'%self.pl)

    def help(self):
        print('这个汽车的颜色【%s】'%self.color)
        print('这个汽车的排量【%s】'%self.pl)
        # print('这个汽车的功能【%s】'%self.fun)

BMW=Car('红色','3.5L')
# BMW.add_fun('水陆两栖')
BMW.help()
# add_fun(BMW,)

import pymysql

class MySQL:
    def __init__(self,host,user,password,db,port=3306,charset='utf8'):
        self.conn = pymysql.connect(host=host,user=user,password=password,db=db,port=port,charset=charset)
        self.cur = self.conn.cursor(cursor=pymysql.cursors.DictCursor)
        #初始化的时候就连接数据库
    def execute_many(self,sql):
        self.cur.execute(sql)
        return self.cur.fetchall()  # [ {},{}  ]
    def execute_one(self,sql):
        self.cur.execute(sql)
        return self.cur.fetchone()
    def __del__(self):
        self.cur.close()
        self.conn.close()
        print('连接已经关闭')

db=MySQL('118.24.3.40','jxz','123456','jxz')

class People:
    country = 'China' #类变量
    def __init__(self,name,sex):
        self.name = name  #实例变量
        self.sex = sex
    def say(self):
        print('name '+self.name)
        print('sex'+self.sex)
        print('country'+self.country)

    @property  #把一个函数变成一个变量，这个变量的值就是函数的返回值
    def get_name(self):
        return self.name

print(People.country)
xiaojun = People("xiaojun",'男')
xiaojun.say()
print(xiaojun.get_name)

class Phone:
    def __del__(self):
        print('哈哈哈哈')
    def call(self,name):
        print('为%s打call，为%s打电话！'%(name,name))
    def __init__(self):
        self.test = 'abc'
        print('我是构造函数')

iphonx = Phone()
print(iphonx.test)
iphonx.call('小军')

class Lw:
    money = 100000
    house = '10套'
    def driver(self):
        print('开车')
    def chouyan(self):
        print('抽烟')
    def hejiu(self):
        print('喝酒')
    def tangtou(self):
        print('烫头')

class Xw(Lw):
    def huaqian(self):
        print('花钱。。。')

class Student():
    def sql(self):
        print('sql')
    def linux(self):
        print('linux')

class PyStudent(Student):
    def python(self):
        print('python')

class XnStudent(Student):
    def xn(self):
        print('xn')
    def sql(self):
        print('sql....')