加密-日志-常用函数与高阶函数（random，iter，filter，map，reduce）

常用函数与高阶函数

- python中的加密工具：hashlib—不可逆；base64—通用型，可解密

import hashlib,base64
import time

# hashlib不可逆的加密函数

# 基础签名
base_sign = 'like'

def custom():
    # time.time() 时间戳是float型，要转换成int型
    a_timestamp = int(time.time())
    _token = '%s%s' % (base_sign,a_timestamp)
    print(_token)
    # 生成hash对象：传入的参数要求是比特类型的，需要编码
    hashobj = hashlib.sha1(_token.encode('utf-8'))
    # 生成16进制加密字符串
    a_token = hashobj.hexdigest()
    print(a_token)
    return a_token,a_timestamp

# 服务端，需要传入两个参数
# 请求方服务的认证token，请求方生成token的时间戳
def b_service_check(token,timestamp):
    _token = "%s%s" % (base_sign,timestamp)
    b_token = hashlib.sha1(_token.encode('utf-8')).hexdigest()
    if token == b_token:
        return True
    else:
        return False

if __name__=='__main__':
    c_token,timestamp = custom()
    # result = b_service_check(c_token,timestamp)
    time.sleep(1)
    result = b_service_check(c_token, int(time.time()))
    if result==True:
        print('a服务合法，服务器B正常响应')
    else:
        print('a服务不合法，拒绝请求响应')

import base64

# base64通用加密函数
replace01 = '%'
replace02 = '$'

def encode(data):
    if isinstance(data,str):
        data = data.encode('utf-8') # 需要转换为比特类型
    elif isinstance(data,bytes):
        data = data
    else:
        raise TypeError('data need bytes or str')
    re = base64.encodebytes(data) #对比特类型进行加密
    re02 = re.decode('utf-8') # bytes类型转换为字符串类型
    print(re02)
    re03 = re02.replace('a',replace01).replace('w',replace02)
    print(re03,type(re03))
    return re03.encode('utf-8')

def decode(data):
    if not isinstance(data,bytes):
        raise TypeError('data need bytes')
    # 需要替换的比特类型
    replace02_b = replace02.encode('utf-8')
    replace01_b = replace01.encode('utf-8')
    print(replace01_b,replace02_b)
    # 还原回原始的base64加密后数据，注意替换的字符必须比特类型
    re = data.replace(replace01_b,b'a').replace(replace02_b,b'w')
    print(re,type(re))
    # # base64解密之后为比特型
    re02 = base64.decodebytes(re)
    print(re02,type(re02))
    # 解密之后的数据进行解码为字符串
    re03 = re02.decode('utf-8')
    return re03
    # return base64.decodebytes(re).decode('utf-8')

if __name__ == "__main__":
    result = encode('hello~ 小云')
    print(result)
    # print(base64.decodebytes(result))
    # print(base64.decodebytes(result).decode('utf-8'))
    de_re = decode(result)
    print(de_re)

- python中的日志模块logging

- 日志等级：debug info warnning error critical

- logging.basicConfig(level=logging.DEBUG,format='%(asctime)s %(filename)s [line:%(lineno)s] %(levelname)s %(message)s')

In [2]: import logging

In [3]: logging.basicConfig(level=logging.DEBUG,format='%(asctime)s %(f
   ...: ilename)s [line:%(lineno)s] %(levelname)s %(message)s')

In [4]: logging.info('你好，小牧')
2022-04-02 22:16:02,449 <ipython-input-4-a48175ba1273> [line:1] INFO 你，小牧

In [5]: logging.error('程序出错了')
2022-04-02 22:19:50,062 <ipython-input-5-e67376584deb> [line:1] ERROR 程序出错了

In [6]: logging.debug
Out[6]: <function logging.debug(msg, *args, **kwargs)>

In [7]: logging.warn
Out[7]: <function logging.warn(msg, *args, **kwargs)>

In [8]: logging.error('aaa')
2022-04-02 22:20:56,727 <ipython-input-8-33ea3a9649fd> [line:1] ERROR aaa

In [9]: logging.ERROR
Out[9]: 40

In [10]: logging.DEBUG
Out[10]: 10

In [11]: logging.WARN
Out[11]: 30
 

 

import logging,os

def init_log(path):
    if os.path.exists(path):
        mode = 'a'
    else:
        mode = 'w'
    logging.basicConfig(
        level=logging.INFO,
        format='%(asctime)s %(filename)s [line:%(lineno)s] %(levelname)s %(message)s',
        filename= path,
        filemode= mode
    )
    return logging
# logging.basicConfig(level=logging.DEBUG,
# format='%(asctime)s %(filename)s [line:%(lineno)s] %(levelname)s %(message)s'

current_path = os.getcwd()
path = os.path.join(current_path,'back.log')
log = init_log(path)
log.info('这是第一个日志信息，test')
log.warning('这是一个警告')
log.error('这是一个重大的错误信息')
log.debug('这是一个debug')

In [1]: abs
Out[1]: <function abs(x, /)>

In [2]: abs(-13)
Out[2]: 13

In [3]: abs(2)
Out[3]: 2

In [4]: re = all(['a' in 'lain',Ture,None])
-----------------------------------------------------------------------
NameError                             Traceback (most recent call last)
Input In [4], in <cell line: 1>()
----> 1 re = all(['a' in 'lain',Ture,None])

NameError: name 'Ture' is not defined

In [5]: re = all(['a' in 'lain',True,None])

In [6]: re
Out[6]: False

In [7]: re = all(['a' in 'lain',True,12,len('123')])

In [8]: re
Out[8]: True

In [9]: python = ['django','flask','tornada']

In [10]: for index,item in enumerate(python):
    ...:     print(index,item)
    ...: 
0 django
1 flask
2 tornada
 

# food = input('你喜欢吃什么水果：')
# print(food)
#
# help(input)

class Test(object):
    a = 1
    b = 2

    def __init__(self):
        self.a = self.a
        self.b = self.b

test = Test()
print(test.a)
# vars返回实例化的字典信息
result = vars(test)
print(result)

# hasattr判断对象中是否有某个属性，返回Ture或者false
print(hasattr(test,'a'))
print(hasattr(test,'c'))
print(hasattr(list,'a'))
print(hasattr(list,'append'))

# 为实例化对象，添加属性与值
setattr(test,'c','wewe')
print(test.c)
print(vars(test))
# getattr通过对象获取属性
print(getattr(list,'append'))
print(getattr(test,'c'))

a = ['',None,True,0]
print(any(a))
print(all(a))

- random.random 模块.函数

- random.random random.uniform random.randint

- random.choice random.sample random.randrange

 

import random

gifts = ['phone','book','car','现金1000元','Mac']

def choice_gifts():
    gift = random.choice(gifts)
    print('你抽到的礼物是%s' % gift)

def choice_gift_new():
    count = random.randrange(0,100,2)
    if 0<= count <=40:
        print('你中了200元')
    elif 40< count <=70:
        print('你中了一台电视')
    elif 70< count <=90:
        print('你中了一台mac电脑')
    elif count> 90:
        print('你中了一辆车')

if __name__ == '__main__':
    choice_gifts()
    choice_gift_new()

 迭代器

- 全部取完之后就会报错，停止运行StopIteration

- 按需加载（类似取苹果）

- 迭代器的生成方法：for循环生成法-yield；for循环-行生成迭代器 程序正常退出，不会报错

# 迭代器:提高效率，节省内存消耗

iter_obj = iter((1,2,3))
# print(next(iter_obj))
# print(next(iter_obj))
# print(next(iter_obj))
# print(next(iter_obj))
# iter中的内容读取完之后，就不能再进行读取了，报错 StopIteration

def _next(iter_obj):
    try:
        return next(iter_obj)
    except StopIteration:
        return None

# print(_next(iter_obj))
# print(_next(iter_obj))
# print(_next(iter_obj))
# print(_next(iter_obj))

# 不会报错，相对更友好
for i in iter_obj:
    print(i)

# 第二种：  yield生成迭代器
def make_iter():
    for i in range(5):
        yield i

iter_obj2 = make_iter()
print('===',type(iter_obj2))

for i in iter_obj2:
    print(i)
print('-----')
# 迭代器会把数据每一次放到内存中，被读取之后，内存就被释放
# 完整的读取完一个迭代器数据后，该迭代器就会被清空了，就没有数据了
for i in iter_obj2:
    print(i)

print('第三种生成迭代器方法')
iter_obj3 = (i for i in range(4))
for i in iter_obj3:
    print(i)
print('-----')
for i in iter_obj3:
    print(i)

- 高级函数，filter map reduce

- filter 对循环根据过滤条件进行过滤，返回一个filter对象

- map 对列表中的每个成员依次执行函数，将执行结果放到新的list中，返回map对象(True/None)

- reduce 对循环前后两个数据进行累加，返回数值

- from funtools import reduce

from functools import reduce

books = ['python','java','C++','golang','flask']
re01 = filter(lambda x:'a'in x,books)
print(re01,list(re01))
print(books)

def filter_func(item):
    if 'a' in item:
        return True

filter_re = filter(filter_func,books)
print(filter_re,tuple(filter_re),type(filter_re))

# map把对应的结果进行True，false的变更
map_re = map(filter_func,books)
print(map_re,list(map_re),type(map_re))

# from functools import reduce
reduce_re = reduce(lambda x,y:x+y,[3,2,4])
print(reduce_re)
reduce_re = reduce(lambda x,y:x*y,[3,2,4])
print(reduce_re)
reduce_re = reduce(lambda x,y:x+y,books)
print(reduce_re)