import hashlib
# 选择加密算法:md5
md5 = hashlib.md5()
# 将待加密的数据传入算法中
md5.update(b‘hello‘)
# 获取加密之后的密文
res = md5.hexdigest()
print(res)

# 加盐处理
md5 = hashlib.md5()
# 数据必须是bytes类型(二进制)
md5.update(‘自己定制的盐‘.encode(‘utf8‘))
md5.update(b‘hello‘)
res = md5.hexdigest()
print(res)

import random
# 随机返回0-1之间的小数
print(random.random())

# 随机返回指定区间的整数 包含首尾
print(random.randint(1, 6))

# 随机抽取一个
print(random.choices([‘一等奖‘, ‘二等奖‘, ‘谢谢回顾‘]))
print(random.choice([‘一等奖‘, ‘二等奖‘, ‘谢谢回顾‘]))

# 随机抽取指定样本个数
print(random.sample([111, 222, 333, 444, 555, 666, 777], 2))

# 随机打乱元素
l = [2, 3, 4, 5, 6, 7, 8, 9, 10, "J", "Q", "K", "A", "小王", "大王"]
random.shuffle(l)
print(l)

import random
def get_code(n):
    code = ‘‘
    # 循环n次决定是几位验证码
    for i in range(n):
        # 每一次循环都应该是三选一
        # 随机的数字 并转成字符串
        random_int = str(random.randint(0, 9))

        # 随机的小写字母 chr可以将数字转换成ASCII码表对应的字母
        random_lower = chr(random.randint(97, 122))

        # 随机的大写字母
        random_upper = chr(random.randint(65, 90))

        # 随机选择一个作为一位验证码
        temp = random.choice([random_int, random_lower, random_upper])
        code += temp
    return code
# 选择验证码的位数
print(get_code(8))

import logging
# 日志级别
logging.debug(‘debug message‘)
logging.info(‘info message‘)
logging.warning(‘warning message‘)
logging.error(‘error message‘)
logging.critical(‘critical message‘)

import logging

file_handler = logging.FileHandler(filename=‘x1.log‘, mode=‘a‘, encoding=‘utf-8‘, )
logging.basicConfig(
    format=‘%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s‘,
    datefmt=‘%Y-%m-%d %H:%M:%S %p‘,
    handlers=[file_handler, ],
    level=logging.ERROR
)

logging.error(‘你好‘)

import time
import logging
from logging import handlers

sh = logging.StreamHandler()
rh = handlers.RotatingFileHandler(‘myapp.log‘, maxBytes=1024, backupCount=5)
fh = handlers.TimedRotatingFileHandler(filename=‘x2.log‘, when=‘s‘, interval=5, encoding=‘utf-8‘)
logging.basicConfig(
    format=‘%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s‘,
    datefmt=‘%Y-%m-%d %H:%M:%S %p‘,
    handlers=[fh, sh, rh],
    level=logging.ERROR
)

for i in range(1, 100000):
    time.sleep(1)
    logging.error(‘KeyboardInterrupt error %s‘ % str(i))

import logging

logger = logging.getLogger()
# 创建一个handler，用于写入日志文件
fh = logging.FileHandler(‘test.log‘, encoding=‘utf-8‘)

# 再创建一个handler，用于输出到控制台
ch = logging.StreamHandler()
formatter = logging.Formatter(‘%(asctime)s - %(name)s - %(levelname)s - %(message)s‘)
fh.setLevel(logging.DEBUG)

fh.setFormatter(formatter)
ch.setFormatter(formatter)
logger.addHandler(fh)  # logger对象可以添加多个fh和ch对象
logger.addHandler(ch)

logger.debug(‘logger debug message‘)
logger.info(‘logger info message‘)
logger.warning(‘logger warning message‘)
logger.error(‘logger error message‘)
logger.critical(‘logger critical message‘)

d = {‘username‘: ‘jason‘, ‘pwd‘: 123}
import json
"""序列化:将其他数据类型转换成json格式的字符串"""
res = json.dumps(d)
print(res, type(res))
# 手动写的""是无效的
d1 = {"username": "jason", "pwd": 123}
print(d1)

"""反序列化:将json格式字符串转换成对应的数据类型"""
res1 = json.loads(res)
print(res1, type(res1))

import json
d = {‘username‘: ‘jason‘, ‘pwd‘: 123}
with open(r‘a.txt‘, ‘w‘, encoding=‘utf8‘) as f:
    # 文件序列化
    json.dump(d, f)

with open(r‘a.txt‘, ‘r‘, encoding=‘utf8‘) as f:
    # 文件反序列化
    res = json.load(f)
    print(res, type(res))