Python ATM功能实现代码实例

import os
user_staus = {'username': None}
def ad_credit(username, amount):
"""
充值功能
:param username:
:param amount:
:return:
"""
if user_staus['username'] is None:
login()
with open('db.txt', 'rt', encoding='utf-8')as f1, \
open('db.txt.swap', 'wt', encoding='utf-8')as f2:
while True:
cont = f1.readline()
if len(cont) == 0:
break
name, remain = cont.strip().split(':')
if username in name:
remain = int(remain) + int(amount)
f2.write('{}:{}\n'.format(name, remain))
print('充值成功，{}的余额为{}'.format(username, remain))
else:
f2.write(cont)
os.remove('db.txt')
os.rename('db.txt.swap', 'db.txt')
def transfer(user_out, user_in, amount):
'''3
转账功能
:param user_out:
:param user_in:
:param amount:
:return:
'''
if user_staus['username'] is None:
login()
with open('db.txt', 'rt', encoding='utf-8')as f1, \
open('db.txt.swap', 'wt', encoding='utf-8')as f2:
userinfo = {}
for line in f1:
name, remind = line.strip().split(':')
userinfo[name] = int(remind)
if user_out not in userinfo:
print('用户不存在')
return
if user_in not in userinfo:
print('收款方不存在')
return
if user_out in userinfo and user_in in userinfo:
if userinfo[user_out]  = int(amount):
userinfo[user_out] -= int(amount)
userinfo[user_in] += int(amount)
print('转账成功，已成功从{}向{}汇款{}'.format(user_out, user_in, amount))
elif userinfo[user_out] < amount:
print('余额不足')
return
for name, remind in userinfo.items():
f2.write('{}:{}\n'.format(name, remind))
os.remove('db.txt')
os.rename('db.txt.swap', 'db.txt')
def cashon(username, amount):
'''
提现功能
:param username:
:param amount:
:return:
'''
if user_staus['username'] is None:
login()
with open('db.txt', 'rt', encoding='utf-8')as f1, \
open('db.txt.swap', 'wt', encoding='utf-8')as f2:
userinfo = {}
for line in f1:
name, remind = line.strip().split(':')
userinfo[name] = int(remind)
if username not in userinfo:
print('用户不存在')
return
if username in userinfo and userinfo[username]  = int(amount):
userinfo[username] -= int(amount)
print('已从余额中取出{}，现余额为{}'.format(amount, userinfo[username]))
elif userinfo[username] < amount:
print('余额不足，提现失败')
return
for name, remind in userinfo.items():
f2.write('{}:{}\n'.format(name, remind))
os.remove('db.txt')
os.rename('db.txt.swap', 'db.txt')
def check(username):
'''
余额查询功能
:param username:
:return:
'''
if user_staus['username'] is None:
login()
with open('db.txt', 'rt', encoding='utf-8')as f:
userinfo = {}
for line in f:
name, remind = line.strip().split(':')
userinfo[name] = remind
if username not in userinfo:
print('用户不存在')
return
if username in userinfo:
print('当前余额为：{}'.format(userinfo[username]))
def login():
username = input('输入用户名')
userpassword = input('输入密码')
with open('login.txt', 'rt', encoding='utf-8')as login_f:
login = {}
for line in login_f:
name, psd = line.strip().split(':')
login[name] = psd
if username in login:
if login[username] == userpassword:
print('登陆成功')
user_staus['username'] = username
break
elif username not in login:
print('用户名不存在')
return
def logout():
user_staus['username'] = None
print('已成功登出')
return
login()
tag = True
while tag:
cmd = input('''
请输入你想使用的功能序号
1：充值
2：转账
3：提现
4：查询余额
0：登出
''')
if cmd == '1':
username = input('输入用户名：')
amount = input('输入充值金额：')
ad_credit(username, amount)
elif cmd == '2':
user_out = input('请输入转账方：')
user_in = input('请输入接收方：')
amount = input('输入转账金额：')
transfer(user_out, user_in, amount)
elif cmd == '3':
username = input('输入用户名：')
amount = input('输入提现金额')
cashon(username, amount)
elif cmd == '4':
username = input('输入用户名：')
check(username)
elif cmd == '0':
logout()
tag = False
else:
print('请正确输入序号')