python基本数据类型及流程控制应用

#2017-05-05 22:10:10一、用户登录及失败锁定账户                           

============================================1.文件读写2.列表split方法3.while循环

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###############################datafile文件内容#larry|123123|1#linzj|123123|0###############################!/usr/bin/env python# -*- coding:utf-8 -*-

# 打开文件读取用户信息f1=open(‘datafile‘,‘r‘)data=f1.read()f1.close()

# 用户信息转载入用户信息列表user_info_list=[]                # 初始化user_info_listuser_str_list=data.split(‘\n‘)# print(user_str_list)for item in user_str_list:    temp=item.split(‘|‘)    v={ ‘name‘:temp[0],        ‘pwd‘:temp[1],        ‘times‘:temp[2]    }    if int(v[‘times‘])!=3:    # 将非锁定账户登录信息重置        v[‘times‘] = 0    user_info_list.append(v)print(user_info_list)

# 登录验证i=0j=1while j==1:    v_user_name = input(‘user name:‘)    v_pwd = input(‘password:‘)    for item in user_info_list:        if item[‘name‘] == v_user_name and int(item[‘times‘])<3:            if item[‘pwd‘] == v_pwd:                 j=2 # 登录成功，设置循环出口                 print(‘welcome back ‘+v_user_name)            else:                i = int(item[‘times‘])                i += 1                item[‘times‘] = i                print(item)                print(user_info_list)            continue        elif item[‘name‘] == v_user_name and int(item[‘times‘])>=3:            print(v_user_name+‘ is locked‘)        else:            continueprint(user_info_list)

# 将用户登录的记录信息赋值给target变量k=0target=‘‘for item in user_info_list:    print(item[‘name‘])    if target!=‘‘:        target=target+‘\n‘    #target.append(item[‘name‘]+‘|‘+item[‘pwd‘]+‘|‘+str(item[‘times‘]))    target=target+item[‘name‘]+‘|‘+item[‘pwd‘]+‘|‘+str(item[‘times‘])    print(target)

# 将target变量值写入文件f2=open(‘datafile‘,‘w‘)f2.write(target)f2.close()

二、元素分类                                                                           

============================================1.列表append方法2.for循环3.if流程控制

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element_list=[11,22,33,44,55,66,77,88,99]

k1=[]k2=[]for item in element_list:    #print(item)    if item<66:        k1.append(item)    else:        k2.append(item)

print(k1,k2)v_dict={‘k1‘:k1,‘k2‘:k2}print(v_dict)

三、购物结算及充值                                    

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1.文件的读写操作2.列表的循环遍历3.整形与字符串数据类型的相互转换

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#!/usr/src/python# -*- coding:utf-8 -*-

import re# 商品初始化v_goods_list=[    {‘name‘:‘电脑‘,‘price‘:‘1000‘},    {‘name‘:‘鼠标‘,‘price‘:‘50‘},    {‘name‘:‘键盘‘,‘price‘:‘100‘},    {‘name‘:‘臭袜子‘,‘price‘:‘2‘},]

# 列出商品for item in v_goods_list:    print(item)#print(v_goods_list)

# 显示余额f1=open(‘balance‘,‘r‘)balance=f1.read()f1.close()

# 选择货物v_aws=1v_total=0while v_aws==1:    if v_aws!=1:        break    v_goods=input(‘选择商品编号:‘)    v_goods=int(v_goods)    v_num=input(‘商品数量:‘)    if v_goods==3:        print(‘艾玛买了‘+v_num+‘双‘+v_goods_list[v_goods][‘name‘])    v_num=int(v_num)    #加入购物车    if v_goods<len(v_goods_list):        v_total+=int(v_goods_list[v_goods][‘price‘])*v_num        print(v_total)    else:        print(‘编号选择错误！‘)    v_aws=input(‘结算?‘)    v_aws = int(v_aws)

# 结算j=1while j==1:    if v_total>int(balance):         print(‘余额不足,请充值‘)         v_balance = input(‘充值金额:‘)         print(v_balance)         balance = int(v_balance) + int(balance)         print(balance)    elif v_total==0:        pass    else:        balance=balance-v_total        print(‘购买成功‘)        j=0

# 余额写回文件保存f2=open(‘balance‘,‘w‘)f2.write(str(balance))f2.close()

四、三级联动                                 

============================================字典、列表的相互嵌套for循环遍历============================================#!/usr/src/python# -*- coding:utf-8 -*-

dic={    ‘河北‘:{        ‘石家庄‘:["鹿泉", "藁城", "元氏"],        ‘邯郸‘:["永年", "涉县", "磁县"]},    ‘山东‘:{        ‘济南‘:["高阳","趵突泉","泰安"],        ‘聊城‘:["青岛","亳州","乾县"]},    ‘贵州‘:{        ‘遵义‘:["遵县","桐梓","道真"],        ‘毕节‘:["纳雍","威宁","黔西"]    }}for item in dic.keys():    print(item)v_fir_region=input(‘请选择省份‘)for item in dic[v_fir_region]:    print(item)v_sec_region=input(‘请选择地市‘)for item in dic[v_fir_region][v_sec_region]:    print(item)