python 模拟普通用户和管路员登录购物系统小程序
程序功能描述如下:不同角色登录,普通用户可以查看商品购买商品、查看购物车和余额、退出;管理员可以充值,可以添加商品、退出
用户信息字典格式:
{
'pp1': {'passwd': '123', 'role': '1', 'money': 97738.5, 'carts': ['MAC', 'MI', 'MAC', 'KKK', 'HHH', 'LLL', 'LLL', 'LLL', 'YYY', 'LLL']},
'pp2': {'passwd': '123', 'role': '2', 'money': 14435.76, 'carts': ['vivo', 'vivo', 'MAC']}
}
商品信息字典格式:
{
'MAC': {'id': '3894710', 'price': 31233.22}, 'vivo': {'id': '1762774', 'price': 1888.0},
'MI': {'id': '1762775', 'price': 2888.0}, 'HHH': {'id': '7053921', 'price': 12312},
'KKK': {'id': '2789035', 'price': 123.22}, 'YYY': {'id': '2936504', 'price': 254.22},
'LLL': {'id': '6091483', 'price': 231.2}, 'LOVONO': {'id': '7631802', 'price': 12321.22}
}
#role是1的话,代表管理员,2代表普通用户
#普通用户:
#1、查看所有的商品
#2、输入商品名称购买商品,购买完了之后要加到自己的购物车里面,钱要减去
#3、可以查看自己购物车和余额,你已经买了xx东西,你还xxx钱
#4、退出
#管理员,1、添加商品,商品名称,商品价格
2、充值,输入用户名,给他加钱
3、退出
程序实现如下:
# 登录def login(u_name, u_pass):
"用户登录"
u_name = str(u_name)
u_pass = str(u_pass)
if not u_name or not u_pass:
print("error,用户名或密码不能为空!")
else:
user_data = {} # 个人账户信息,用于登录成功后返回
with open('users.txt', 'r', encoding='utf-8') as fr:
fr.seek(0)
user_info = eval(fr.read())
fr.close()
if u_name not in user_info:
print("error,用户名不存在!")
elif u_pass != user_info[u_name]['passwd']:
print("error,输入密码错误!")
else:
user_data[u_name] = user_info[u_name]
print('success,登录成功,用户信息:', user_data)
return user_data
# 查看所有商品
def get_goods():
"查询所有商品"
with open('goods.txt', 'r', encoding='utf-8') as fr:
fr.seek(0)
goods_info = eval(fr.read())
fr.close()
print('success,查询所有商品成功,商品信息:', goods_info)
return goods_info
# 购买商品
def bug_goods(u_name, g_name):
"用户购买商品"
g_name = str(g_name)
u_name = str(u_name)
if not g_name or not u_name:
return 'error,用户名或商品名称不能为空'
goods_info = get_goods()
if g_name not in goods_info:
return 'error,商品%s不存在' % g_name
else:
with open('users.txt', 'a+', encoding='utf-8') as fa:
fa.seek(0)
user_info = eval(fa.read())
if user_info[u_name]['money'] - goods_info[g_name]['price'] < 0:
return 'error,用户余额不足'
u_pass = user_info[u_name]['passwd']
u_role = user_info[u_name]['role']
u_money = user_info[u_name]['money'] - goods_info[g_name]['price']
u_money = round(u_money, 2)
u_carts = user_info[u_name]['carts']
u_carts.append(g_name)
user_info[u_name] = {'passwd': u_pass, 'role': u_role, 'money': u_money, 'carts': u_carts}
fa.seek(0)
fa.truncate()
fa.flush()
fa.write(str(user_info))
fa.close()
return 'success,购买:{goods} 成功,购物车商品:{carts}'.format(goods=g_name, carts=u_carts)
# 查询用户购物车和余额
def get_carts_money(u_name):
"查询用户购物车、余额"
u_name = str(u_name)
if not u_name:
return 'error,用户名不能为空'
else:
with open('users.txt', encoding='utf-8') as f:
f.seek(0)
user_info = eval(f.read())
f.close()
u_carts = user_info[u_name]['carts']
u_money = user_info[u_name]['money']
return 'success,查询用户购物车和余额成功,用户名:{name},购物车:{carts} ,账户余额:{money}元'.format(name=u_name, carts=u_carts, money= u_money)
# 添加商品
def add_goods(g_name, g_price):
"添加商品"
import string, random
src_id = string.digits
g_id = ''.join(random.sample(src_id, 7))
g_name = str(g_name)
if not g_name:
return 'error,添加商品失败,商品名称必须输入'
try:
price = round(float(g_price), 2)
if price <= 0:
return 'error,添加商品失败,商品价格须大于0'
with open('goods.txt', 'a+', encoding='utf-8') as fa:
fa.seek(0)
goods_info = eval(fa.read())
goods_data = {g_name: {'id': g_id, 'price': price}}
goods_info.update(goods_data)
fa.seek(0)
fa.truncate()
fa.flush()
fa.write(str(goods_info))
fa.close()
return 'success,添加商品:{goods}成功'.format(goods=goods_data)
except ValueError:
return 'error,添加商品失败,商品价格输入格式错误'
# 用户充值
def recharge(u_name, amount):
"输入用户名给用户充值"
u_name = str(u_name)
try:
u_amount = round(float(amount), 2)
if u_amount <= 0:
return 'error,充值金额须大于0'
with open ('users.txt', 'a+', encoding='utf-8') as f:
f.seek(0)
user_info = eval(f.read())
if u_name not in user_info:
return 'error,用户名不存在'
u_pass = user_info[u_name]['passwd']
u_role = user_info[u_name]['role']
u_money = user_info[u_name]['money']+u_amount
u_carts = user_info[u_name]['carts']
user_data = {u_name: {'passwd': u_pass, 'role': u_role, 'money': u_money, 'carts': u_carts}}
user_info.update(user_data)
f.seek(0)
f.truncate()
f.flush()
f.write(str(user_info))
f.close()
return 'success,给用户:{user}充值成功,账户余额:{amount}元'.format(user=u_name, amount=user_data[u_name]['money'])
except ValueError:
return 'error,充值金额输入格式错误'
# 退出程序
def exit_sys():
exit('退出程序')
# 普通用户
def user_role1(uName):
choice = input('请输入你的选择:1:查看所有商品 2:购买商品 3:查看购物车和余额 4:退出\n').strip()
if choice == '1':
print(get_goods())
elif choice == '2':
goods_name = input("请输入要购买商品名称:\n").strip()
print(bug_goods(uName, goods_name))
elif choice == '3':
print(get_carts_money(uName))
elif choice == '4':
exit_sys()
user_role1(uName)
# 管理员用户
def user_role2():
choice = input('请输入你的选择:1:添加商品 2:给用户充值 3:退出\n').strip()
if choice == '1':
goods_name = input("请输入你要添加的商品名称:\n").strip()
goods_price = input("请输入添加商品价格:\n").strip()
print(add_goods(goods_name, goods_price))
elif choice == '2':
u_name = input("请输入你要充值的用户名:\n").strip()
amount = input("请输入充值金额:\n").strip()
print(recharge(u_name, amount))
elif choice == '3':
exit_sys()
user_role2()
# 主体部分
uName = input("请输入登录用户名:\n").strip()
uPass = input("请输入登录密码:\n").strip()
user = login(uName, uPass)
if user: # 用户登录成功
# 普通用户:
if user[uName]['role'] == '1':
user_role1(uName)
# 管理员用户:
elif user[uName]['role'] == '2':
user_role2()
else:
print("用户角色不存在")
else:
print("登录失败")
exit_sys()
上面的代码中,多次文件读写操作,代码重复太多,可以考虑把文件读写操作放在一个函数里面:
def open_file(file_name, content=None):"文件读写"
f = open(file_name, 'a+', encoding='utf-8')
f.seek(0)
if content:
f.truncate()
f.write(str(content))
f.flush()
res = None
else:
res = eval(f.read())
f.close()
return res
这样优化以后的代码如下:
# 登录def login(u_name, u_pass):
"用户登录"
u_name = str(u_name)
u_pass = str(u_pass)
if not u_name or not u_pass:
print("error,用户名或密码不能为空!")
else:
user_data = {} # 个人账户信息,用于登录成功后返回
user_info = open_file('users.txt')
if u_name not in user_info:
print("error,用户名不存在!")
elif u_pass != user_info[u_name]['passwd']:
print("error,输入密码错误!")
else:
user_data[u_name] = user_info[u_name]
print('success,登录成功,用户信息:', user_data)
return user_data
# 查看所有商品
def get_goods():
"查询所有商品"
goods_info = open_file('goods.txt')
print('success,查询所有商品成功,商品信息:', goods_info)
return goods_info
# 购买商品
def bug_goods(u_name, g_name):
"用户购买商品"
g_name = str(g_name)
u_name = str(u_name)
if not g_name or not u_name:
return 'error,用户名或商品名称不能为空'
goods_info = open_file('goods.txt')
if g_name not in goods_info:
return 'error,商品%s不存在' % g_name
else:
user_info = open_file('users.txt')
if user_info[u_name]['money'] - goods_info[g_name]['price'] < 0:
return 'error,用户余额不足'
u_pass = user_info[u_name]['passwd']
u_role = user_info[u_name]['role']
u_money = user_info[u_name]['money'] - goods_info[g_name]['price']
u_money = round(u_money, 2)
u_carts = user_info[u_name]['carts']
u_carts.append(g_name)
user_info[u_name] = {'passwd': u_pass, 'role': u_role, 'money': u_money, 'carts': u_carts}
open_file('users.txt',user_info)
return 'success,购买:{goods} 成功,购物车商品:{carts}'.format(goods=g_name, carts=u_carts)
# 查询用户购物车和余额
def get_carts_money(u_name):
"查询用户购物车、余额"
u_name = str(u_name)
if not u_name:
return 'error,用户名不能为空'
else:
user_info = open_file('users.txt')
u_carts = user_info[u_name]['carts']
u_money = user_info[u_name]['money']
return 'success,查询用户购物车和余额成功,用户名:{name},购物车:{carts} ,账户余额:{money}元'.format(name=u_name, carts=u_carts, money= u_money)
# 添加商品
def add_goods(g_name, g_price):
"添加商品"
import string, random
src_id = string.digits
g_id = ''.join(random.sample(src_id, 7))
g_name = str(g_name)
if not g_name:
return 'error,添加商品失败,商品名称必须输入'
try:
price = round(float(g_price), 2)
if price <= 0:
return 'error,添加商品失败,商品价格须大于0'
goods_info = open_file('goods.txt')
goods_data = {g_name: {'id': g_id, 'price': price}}
goods_info.update(goods_data)
open_file('goods.txt', goods_info)
return 'success,添加商品:{goods}成功'.format(goods=goods_data)
except ValueError:
return 'error,添加商品失败,商品价格输入格式错误'
# 用户充值
def recharge(u_name, amount):
"输入用户名给用户充值"
u_name = str(u_name)
try:
u_amount = round(float(amount), 2)
if u_amount <= 0:
return 'error,充值金额须大于0'
user_info = open_file('users.txt')
if u_name not in user_info:
return 'error,用户名不存在'
u_pass = user_info[u_name]['passwd']
u_role = user_info[u_name]['role']
u_money = user_info[u_name]['money']+u_amount
u_carts = user_info[u_name]['carts']
user_data = {u_name: {'passwd': u_pass, 'role': u_role, 'money': u_money, 'carts': u_carts}}
user_info.update(user_data)
open_file('users.txt',user_info)
return 'success,给用户:{user}充值成功,账户余额:{amount}元'.format(user=u_name, amount=user_data[u_name]['money'])
except ValueError:
return 'error,充值金额输入格式错误'
# 退出程序
def exit_sys():
exit('退出程序')
# 普通用户
def user_role1(uName):
choice = input('请输入你的选择:1:查看所有商品 2:购买商品 3:查看购物车和余额 4:退出\n').strip()
if choice == '1':
print(get_goods())
elif choice == '2':
goods_name = input("请输入要购买商品名称:\n").strip()
print(bug_goods(uName, goods_name))
elif choice == '3':
print(get_carts_money(uName))
elif choice == '4':
exit_sys()
user_role1(uName)
# 管理员用户
def user_role2():
choice = input('请输入你的选择:1:添加商品 2:给用户充值 3:退出\n').strip()
if choice == '1':
goods_name = input("请输入你要添加的商品名称:\n").strip()
goods_price = input("请输入添加商品价格:\n").strip()
print(add_goods(goods_name, goods_price))
elif choice == '2':
u_name = input("请输入你要充值的用户名:\n").strip()
amount = input("请输入充值金额:\n").strip()
print(recharge(u_name, amount))
elif choice == '3':
exit_sys()
user_role2()
# 主体部分
uName = input("请输入登录用户名:\n").strip()
uPass = input("请输入登录密码:\n").strip()
user = login(uName, uPass)
if user: # 用户登录成功
# 普通用户:
if user[uName]['role'] == '1':
user_role1(uName)
# 管理员用户:
elif user[uName]['role'] == '2':
user_role2()
else:
print("用户角色不存在")
else:
print("登录失败")
exit_sys()
这样代码就精简了很多
运行结果如下:
普通用户:
请输入登录用户名:pp1
请输入登录密码:
123
success,登录成功,用户信息: {'pp1': {'passwd': '123', 'role': '1', 'money': 96737.28, 'carts': ['MAC', 'MI', 'MAC', 'KKK', 'HHH', 'LLL', 'LLL', 'LLL', 'YYY']}}
请输入你的选择:1:查看所有商品 2:购买商品 3:查看购物车和余额 4:退出
asd
请输入你的选择:1:查看所有商品 2:购买商品 3:查看购物车和余额 4:退出
1
success,查询所有商品成功,商品信息: {'MAC': {'id': '3894710', 'price': 31233.22}, 'vivo': {'id': '1762774', 'price': 1888.0}, 'MI': {'id': '1762775', 'price': 2888.0}, 'HHH': {'id': '7053921', 'price': 12312}, 'KKK': {'id': '2789035', 'price': 123.22}, 'YYY': {'id': '2936504', 'price': 254.22}, 'LLL': {'id': '6091483', 'price': 231.2}}
{'MAC': {'id': '3894710', 'price': 31233.22}, 'vivo': {'id': '1762774', 'price': 1888.0}, 'MI': {'id': '1762775', 'price': 2888.0}, 'HHH': {'id': '7053921', 'price': 12312}, 'KKK': {'id': '2789035', 'price': 123.22}, 'YYY': {'id': '2936504', 'price': 254.22}, 'LLL': {'id': '6091483', 'price': 231.2}}
请输入你的选择:1:查看所有商品 2:购买商品 3:查看购物车和余额 4:退出
3
success,查询用户购物车和余额成功,用户名:pp1,购物车:['MAC', 'MI', 'MAC', 'KKK', 'HHH', 'LLL', 'LLL', 'LLL', 'YYY'] ,账户余额:96737.28元
请输入你的选择:1:查看所有商品 2:购买商品 3:查看购物车和余额 4:退出
2
请输入要购买商品名称:
LLL
success,查询所有商品成功,商品信息: {'MAC': {'id': '3894710', 'price': 31233.22}, 'vivo': {'id': '1762774', 'price': 1888.0}, 'MI': {'id': '1762775', 'price': 2888.0}, 'HHH': {'id': '7053921', 'price': 12312}, 'KKK': {'id': '2789035', 'price': 123.22}, 'YYY': {'id': '2936504', 'price': 254.22}, 'LLL': {'id': '6091483', 'price': 231.2}}
success,购买:LLL 成功,购物车商品:['MAC', 'MI', 'MAC', 'KKK', 'HHH', 'LLL', 'LLL', 'LLL', 'YYY', 'LLL']
请输入你的选择:1:查看所有商品 2:购买商品 3:查看购物车和余额 4:退出
4
退出程序
Process finished with exit code 1
管理员用户:
请输入登录用户名:pp2
请输入登录密码:
123
success,登录成功,用户信息: {'pp2': {'passwd': '123', 'role': '2', 'money': 14435.76, 'carts': ['vivo', 'vivo', 'MAC']}}
请输入你的选择:1:添加商品 2:给用户充值 3:退出
g
请输入你的选择:1:添加商品 2:给用户充值 3:退出
1
请输入你要添加的商品名称:
LOVONO
请输入添加商品价格:
12321.22
success,添加商品:{'LOVONO': {'id': '7631802', 'price': 12321.22}}成功
请输入你的选择:1:添加商品 2:给用户充值 3:退出
2
请输入你要充值的用户名:
pp1
请输入充值金额:
321321。232
error,充值金额输入格式错误
请输入你的选择:1:添加商品 2:给用户充值 3:退出
2
请输入你要充值的用户名:
pp1
请输入充值金额:
1232.42
success,给用户:pp1充值成功,账户余额:97738.5元
请输入你的选择:1:添加商品 2:给用户充值 3:退出
3
退出程序
Process finished with exit code 1
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