python之异常处理实例及加密

发表于 更新于 分类于 ， Changyan： 本文字数： 179 阅读时长 ≈ 1 分钟

python异常处理实例记录，简单一个例子来说明异常处理的使用方式，简单做下笔记

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class FileNotFoundException(Exception):
    def __init__(self):
        self.code   = 1001
        self.msg    = '文件不存在'

class ContentNotFoundException(Exception):
    def __init__(self):
        self.code   = 1002
        self.msg    = '查询结果为空'

class KeyEmptyException(Exception):
    def __init__(self):
        self.code   = 1003
        self.msg    = '关键词不能为空'

import os
def search_str(file, key):
    try:
        if not os.path.exists(file):
            raise FileNotFoundException()
        if key == '':
            raise KeyEmptyException()
        with open(file, mode='r', encoding='utf8') as f:
            for line in f:
                if line.startswith(key):
                    print('找到了，',line)
                    break
            else:
                raise ContentNotFoundException()

    except FileNotFoundException as e:
        print(e.code, e.msg)
    except ContentNotFoundException as e:
        print(e.code, e.msg)
    except KeyEmptyException as e:
        print(e.code, e.msg)
    except Exception as e:
        print(e)
search_str('aaa.text', 'ddd')

python MD5加密：

python中md5加密需要引入一个模块hashlib

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hashlib
obj = hashlib.md5()
obj.update(.encode())
v = obj.hexdigest()

(objv)