零碎知识点：装饰器、MD5、异常、日志

import time
def timer(func):
    def inner():
        start = time.time()
        func()
        print(time.time() - start)
    return inner

@timer   #==> func1 = timer(func1)
def func1():
    print(‘in func1‘)


func1()

import time
def timer(func):
    def inner(*args,**kwargs):
        start = time.time()
        re = func(*args,**kwargs)
        print(time.time() - start)
        return re
    return inner

@timer   #==> func1 = timer(func1)
def func1(a,b):
    print(‘in func1‘)

@timer   #==> func2 = timer(func2)
def func2(a):
    print(‘in func2 and get a:%s‘%(a))
    return ‘fun2 over‘

func1(‘aaaaaa‘,‘bbbbbb‘)
print(func2(‘aaaaaa‘))

import time
def timer(func):
    def inner(*args,**kwargs):
        start = time.time()
        re = func(*args,**kwargs)
        print(time.time() - start)
        return re
    return inner

@timer   #==> func2 = timer(func2)
def func2(a):
    print(‘in func2 and get a:%s‘%(a))
    return ‘fun2 over‘

func2(‘aaaaaa‘)
print(func2(‘aaaaaa‘))

def index():
    ‘‘‘这是一个主页信息‘‘‘
    print(‘from index‘)

print(index.__doc__)    #查看函数注释的方法
print(index.__name__)   #查看函数名的方法

from functools import wraps

def deco(func):
    @wraps(func) #加在最内层函数正上方
    def wrapper(*args,**kwargs):
        return func(*args,**kwargs)
    return wrapper

@deco
def index():
    ‘‘‘哈哈哈哈‘‘‘
    print(‘from index‘)

print(index.__doc__)
print(index.__name__)

def outer(flag):
    def timer(func):
        def inner(*args,**kwargs):
            if flag:
                print(‘‘‘执行函数之前要做的‘‘‘)
            re = func(*args,**kwargs)
            if flag:
                print(‘‘‘执行函数之后要做的‘‘‘)
            return re
        return inner
    return timer

@outer(False)
def func():
    print(111)

func()

import hashlib
def my_md5(s):
obj = hashlib.md5(b"fjlksajflkjasfsalwer123dfskjf")
obj.update(s.encode("utf-8")) # 加密的必须是字节
miwen = obj.hexdigest()
return miwen
# alex: 99fca4b872fa901aac30c3e952ca786d
username = input("请输??户名:")
password = input("请输?密码:")
# 数据存储的时候.
# username: my_md5(password)# 假设现在的?户名和密码分别是
# wusir: 99fca4b872fa901aac30c3e952ca786d ==> wusir: alex
# ?户登录
if username == "wusir" and my_md5(password) ==
"99fca4b872fa901aac30c3e952ca786d":
print("成功")
else:
print("失败")

def chu(a, b):
return a/b
ret = chu(10, 0)
print(ret)
结果:
Traceback (most recent call last):
File "/Users/sylar/PycharmProjects/oldboy/?向对象/day05.py", line 100, in
<module>
ret = chu(10, 0)
File "/Users/sylar/PycharmProjects/oldboy/?向对象/day05.py", line 98, in
chu
return a/b
ZeroDivisionError: division by zero

def chu(a, b):
return a/b
try:
ret = chu(10, 0)
print(ret)
except Exception as e:
print("除数不能是0")
结果:
除数不能是0

try:‘‘‘操作‘‘‘
except Exception as e:
‘‘‘异常的?类，可以捕获所有的异常‘‘‘
else:
‘‘‘保护不抛出异常的代码, 当try中?异常的时候执?‘‘‘
finally:
‘‘‘最后总是要执?我‘‘‘

def add(a, b):
‘‘‘
给我传递两个整数. 我帮你计算两个数的和
:param :param a:
:param :param b:
:return :return:
‘‘‘
if not type(a) == int and not type(b) == int:
# 当程序运?到这句话的时候. 整个函数的调?会被中断. 并向外抛出?个异常.
raise Exception("不是整数, 朕不能帮你搞定这么复杂的运算.")
return a + b
# 如果调??不处理异常. 那产?的错误将会继续向外抛. 最后就抛给了?户
# add("你好", "我叫赛利亚")
# 如果调??处理了异常. 那么错误就不会丢给?户. 程序也能正常进?
try:
add("胡辣汤", "滋滋冒油的?腰?")
except Exception as e:
print("报错了. ??处理去吧")

# 继承Exception. 那这个类就是?个异常类
class GenderError(Exception):
pass
class Person:
def __init__(self, name, gender):
self.name = name
self.gender = gender
def nan_zao_tang_xi_zao(person):
if person.gender != "男":
raise GenderError("性别不对. 这?是男澡堂?")
p1 = Person("alex", "男")
p2 = Person("eggon", "蛋")
# nan_zao_tang_xi_zao(p1)
# nan_zao_tang_xi_zao(p2) # 报错. 会抛出?个异常: GenderError
# 处理异常
try:
nan_zao_tang_xi_zao(p1)
nan_zao_tang_xi_zao(p2)
except GenderError as e:
print(e) # 性别不对, 这?是男澡堂?
except Exception as e:
print("反正报错了")

import traceback
# 继承Exception. 那这个类就是?个异常类
class GenderError(Exception):
pass
class Person:
def __init__(self, name, gender):
self.name = name
self.gender = genderdef nan_zao_tang_xi_zao(person):
if person.gender != "男":
raise GenderError("性别不对. 这?是男澡堂?")
p1 = Person("alex", "男")
p2 = Person("eggon", "蛋")
# nan_zao_tang_xi_zao(p1)
# nan_zao_tang_xi_zao(p2) # 报错. 会抛出?个异常: GenderError
# 处理异常
try:
nan_zao_tang_xi_zao(p1)
nan_zao_tang_xi_zao(p2)
except GenderError as e:
val = traceback.format_exc() # 获取到堆栈信息
print(e) # 性别不对. 这?是男澡堂?
print(val)
except Exception as e:
print("反正报错了")
结果:
性别不对. 这?是男澡堂?
Traceback (most recent call last):
File "/Users/sylar/PycharmProjects/oldboy/?向对象/day05.py", line 155, in
<module>
nan_zao_tang_xi_zao(p2)
File "/Users/sylar/PycharmProjects/oldboy/?向对象/day05.py", line 144, in
nan_zao_tang_xi_zao
raise GenderError("性别不对. 这?是男澡堂?")
GenderError: 性别不对. 这?是男澡堂?

# filename: ?件名
# format: 数据的格式化输出. 最终在?志?件中的样?
# 时间-名称-级别-模块: 错误信息
# datefmt: 时间的格式
# level: 错误的级别权重, 当错误的级别权重?于等于leval的时候才会写??件
logging.basicConfig(filename=‘x1.txt‘,
format=‘%(asctime)s - %(name)s - %(levelname)s -%
(module)s: %(message)s‘,
datefmt=‘%Y-%m-%d %H:%M:%S‘,
level=0) # 当前配置表示 10以上的分数会被写??件
# CRITICAL = 50
# FATAL = CRITICAL
# ERROR = 40
# WARNING = 30
# WARN = WARNING
# INFO = 20
# DEBUG = 10
# NOTSET = 0
logging.critical("我是critical") # 50分. 最贵的
logging.error("我是error") # 40分logging.warning("我是警告") # 警告 30
logging.info("我是基本信息") # 20
logging.debug("我是调试") # 10
logging.log(2, "我是?定义") # ?定义. 看着给分

import logging
# 创建?个操作?志的对象logger（依赖FileHandler）
file_handler = logging.FileHandler(‘l1.log‘, ‘a‘, encoding=‘utf-8‘)
file_handler.setFormatter(logging.Formatter(fmt="%(asctime)s - %(name)s - %
(levelname)s -%(module)s: %(message)s"))
logger1 = logging.Logger(‘s1‘, level=logging.ERROR)
logger1.addHandler(file_handler)
logger1.error(‘我是A系统‘)# 再创建?个操作?志的对象logger（依赖FileHandler）
file_handler2 = logging.FileHandler(‘l2.log‘, ‘a‘, encoding=‘utf-8‘)
file_handler2.setFormatter(logging.Formatter(fmt="%(asctime)s - %(name)s -
%(levelname)s -%(module)s: %(message)s"))
logger2 = logging.Logger(‘s2‘, level=logging.ERROR)
logger2.addHandler(file_handler2)
logger2.error(‘我是B系统‘)