privilege.py

python的典型方法,对初学的python的人有一定的借鉴作用。

import pickle
from time import time
class User(object):
    def __init__(self, name, pwd):
        self.name = name
        self.pwd = pwd
        self.lastLogin = time()
        
def login(user, pwd):

    f = open('userdef.p', 'r')
    try:
       l = pickle.load(f)
       f.close()
       if l == None:           
           return False
       i = 0
       while i<len(l):
           if l[i] == user and l[i+1] == pwd:
               break
           i += 2
       if i == len(l):
           return False
       return True
    except Exception, e:
       raise AttributeError, "Error while loading userdefinition!"
        
def add(user, pwd):
    f = open('userdef.p', 'r')
    u = User(user, pwd)
    l = []
    try:
        l = list(pickle.load(f))
    except EOFError , e:
        pass
    f.close()
    f = open('userdef.p', 'w')
    if user in l:
            f.close()
            return False
    l.append(user)
    l.append(pwd)
    pickle.dump(tuple(l), f)
    f.close()
    return True

def dicAdd(user, pwd):
    f = open('dictdef.txt')
    dic = {}
    try:
        dic = pickle.load(f)
    except EOFError, e:
        pass
    f.close()
    if user in dic:
        return False
    dic[user] = User(user, pwd)
    f = open('dictdef.txt', 'w')
    pickle.dump(dic, f)
    f.close()
    return True

def dicLogin(user, pwd):
    f = open('dictdef.txt')
    dic = {}
    try:
        dic = pickle.load(f)
        f.close()
    except EOFError, e:        
        return False
    if user not in dic or dic[user].pwd != pwd:
        return False
    print "Your last login time is: %s." %( dic[user].lastLogin )
    dic[user].lastLogin = time()
    f = open('dictdef.txt', 'w')
    pickle.dump(dic, f)
    f.close()
    return True

print dicAdd('twf', 'dldk')
print dicAdd('liu', '939')
print dicAdd('ye', 'ipp')

print dicLogin('twf', 'dldk')
print dicLogin('ii', 'dldk')
print dicLogin('ye', 'ipp')