class Foo:

    def __init__(self,name,age,sex):

        self.name = name

        self.age = age

        self.sex = sex

    def __getitem__(self, item):

        if hasattr(self,item):

            return self.__dict__[item]

    def __setitem__(self,key,value):

        self.__dict__[key] = value

    def __delitem__(self, key):

        del self.__dict__[key]

f = Foo('egon',38,'男')

print(f['name'])

f['hobby'] = '男'

print(f.hobby,f['hobby'])

print(f.__dict__)

del f['hobby']

print(f.__dict__)

# __new__

class A:

    def __init__(self):

        self.x = 1

        print('in init function')

    def __new__(cls, *args, **kwargs):

        print('in new function')

        return object.__new__(A, *args, **kwargs)

a = A()

print(a.x)

in new function

in init function

1

# __eq__

class A:

    def __init__(self,name):

        self.name = name

    def __eq__(self, other):

        if self.name == other.name:

            return True

        else:

            return False

obj1= A('egg')

obj2 = A('egg')

print(obj1 == obj2)

# __hash__

class A:
    def __init__(self,name,sex):
        self.name = name
        self.sex = sex
    def __hash__(self):
        return hash(self.name+self.sex)
a = A('egon','男')
b = A('egon','男')
print(hash(a))
print(hash(b))

import hashlib   #提供摘要算法的模块

md5 = hashlib.md5()

md5.update(b'tim')

print(md5.hexdigest())

import hashlib   #提供摘要算法的模块

sha = hashlib.sha1()

sha.update(b'tim')

print(sha.hexdigest())

import hashlib   #提供摘要算法的模块

usr = input('username: ')

pwd = input('password: ')

with open('userinfo') as f:

    for line in f:

        user,passwd,role = line.split('|')

        md5 =hashlib.md5()

        md5.update(bytes(pwd,encoding='utf-8'))

        md5_pwd = md5.hexdigest()

        if usr == usr and md5_pwd == passwd:

            print('sucess login in')

# 加盐

import hashlib   #提供摘要算法的模块

md5 = hashlib.md5(bytes('salt',encoding='utf-8'))

md5.update(b'tim')

print(md5.hexdigest())