python学习之最简单的用户注册及登录验证小程序

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正如很多同学所知道的，楼主开始学习python了，前进的道路曲曲折折，有荆棘也有陷阱，从最简单的小程序写起，每天练习，将python进行到底。

有一点比较别扭的就是python的换行之后空四个空格，ruby都是两个，并且python在方法和循环语句的第一句都要加冒号

mysql> show create table user;
mysql> alter table user add salt char(10);

import hashlib
In [64]: passwd=''

In [67]: md5pass=hashlib.md5(passwd)

In [69]: hashlib.md5(passwd).hexdigest()
Out[69]: '96e79218965eb72c92a549dd5a330112'

In [70]: hashlib.sha1(passwd).hexdigest()
Out[70]: '3d4f2bf07dc1be38b20cd6e46949a1071f9d0e3d'

In [71]: len(hashlib.sha1(passwd).hexdigest())
Out[71]: 40

In [72]: import string

In [73]: import random
In [74]: string.letters
Out[74]: 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'

In [75]: string.digits
Out[75]: ''

In [76]: string.digits+string.letters
Out[76]: '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'

In [77]: random.sample(string.letters,5)
Out[77]: ['S', 'E', 'w', 'F', 'L']

In [78]: ''.join(random.sample(string.letters,10))
Out[78]: 'RVviZAqLQK'

dbconfig ={
    'host':'localhost',
    'user':'root',
    'passwd':'',
    'charset':'utf8',
    'db':'db_02'
    }
import MySQLdb
import string
import random
import hashlib

class User(object):
    def __init__(self, name, email, passwd,salt):
        conn = MySQLdb.connect(**dbconfig)
        cursor = conn.cursor()
        sql = 'insert into user(name, email, password, salt) values(%s, %s, %s, %s)'
        cursor.execute(sql, (name, email, passwd, salt))
        #self.name = name
        #self.email = email
        conn.commit()
        cursor.close()
        conn.close()

    @staticmethod
    def regist( name, email, passwd):
        salt,passwd = User.salt_passwd(passwd)
        User(name, email, passwd, salt)

    @staticmethod
    def login(name, passwdin):
        conn = MySQLdb.connect(**dbconfig)
        cursor = conn.cursor()
        sql = 'select id,name,email,password,salt from user where name=%s'
        if cursor.execute(sql, (name,)):
            userid,name, email, passwd, salt =cursor.fetchone()
            #print cursor.fetchone()
            salt_passwdin = hashlib.sha1(salt+passwdin).hexdigest()
            if passwd == salt_passwdin:
                return userid
        return None

    #def get_user(userid)
    def get_name(self, userid):
        return userid, name, email, 

    @staticmethod
    def salt_passwd(passwd):
        salt = ''.join(random.sample(string.letters, 10))
        passwd = hashlib.sha1(salt+passwd).hexdigest()
        return salt, passwd

testuser = {
    'name':'alen',
    'passwd':'',
    'email':'alen@a.com'
}

#User.regist(**testuser)  

print User.login(name='alenaaa', passwdin='')