python第十三天作业
1、编写文件修改功能，调用函数时，传入三个参数（修改的文件路径，要修改的内容，修改后的内容）既可完成文件的修改
def file_fuc(x, y, z):
import os
with open(r'{}'.format(x), 'rb') as rf, \
open(r'{}.swap'.format(x), 'wb') as wf:
while True:
res = rf.readline().decode('utf-8')
if y in res:
data = res.replace('{}'.format(y), '{}'.format(z))
wf.write(data.encode('utf-8'))
else:
wf.write('{}'.format(res).encode('utf-8'))
if len(res) == 0:
break
os.remove(r'{}'.format(x))
os.rename(r'{}.swap'.format(x), r'{}'.format(x))
return '修改成功'
path_file = input('修改的文件路径:>>').strip()
file1_info = input('要修改的内容:>>').strip()
file2_info = input('修改后的内容:>>').strip()
if path_file and file1_info and file2_info:
msg = file_fuc(path_file,file1_info,file2_info)
print(msg)
else:
print('输入格式失败')
2、编写tail工具
def tail(x):
import time
import os
if not os.path.exists('{}'.format(x)):
with open('{}'.format(x), 'wb') as f:
f.write('创建该日志文件\n'.encode('utf-8'))
with open(r'{}'.format(x), 'rb') as f1:
f1.seek(0, 2)
while True:
a = f1.readline().decode('utf-8')
if len(a) == 0:
time.sleep(1) # 因为自动写入速度太快了，所以给他控制个时间
test(x)
else:
print(a)
def test(x):
with open(r'{}'.format(x), 'ab') as wf:
wf.write('2020114455001 egon转账200w\n'.encode('utf-8'))
msg = input('请输入需要观察的日志目录：>>')
tail(msg)
3、编写登录功能
def login(user,pwd):
with open(r'db.txt', 'rt', encoding='utf-8') as f:
for line in f:
x,y = line.strip().split(':')
if user == x and pwd == y:
print('登录成功')
else:
print('失败')
username = input('账号:>>').strip()
password = input('密码:>>').strip()
login(username,password)
4、编写注册功能
def register(x, y):
with open(r'db.txt', 'at', encoding='utf-8') as f:
for line in f:
user, pwd = line.strip().split(':')
if x == user:
print("用户名已存在")
break
else:
f.write('{}:{}\n'.format(x, y))
username = input("用户名：>>").strip()
password = input("密码：>>").strip()
register(username, password)
选做题
编写ATM程序实现下述功能，数据来源于文件db.txt
1、充值功能：用户输入充值钱数，db.txt中该账号钱数完成修改
2、转账功能：用户A向用户B转账1000元，db.txt中完成用户A账号减钱，用户B账号加钱
3、提现功能：用户输入提现金额，db.txt中该账号钱数减少
4、查询余额功能：输入账号查询余额
def login(user, pwd):
with open(r'db.txt', 'rt', encoding='utf-8') as f:
for line in f:
x, y, z = line.strip().split(':')
if user == x and pwd == y:
print('登录成功')
return 1
else:
print('失败')
return 0
def recharge_fuc(name, money): # 充值功能
with open(r'db.txt', 'rb') as rf, \
open(r'db.txt.swap', 'wb') as wf:
while True:
user_msg = rf.readline().decode('utf-8')
*_, z = user_msg.strip().split(':')
if name in user_msg:
money = int(z) + int(money)
data = user_msg.replace('{}'.format(z), '{}'.format(money))
wf.write(data.encode('utf-8'))
else:
wf.write('{}'.format(user_msg).encode('utf-8'))
if len(user_msg) == 0:
break
move_fuc()
return '充值成功'
def take_fuc(username1, username2, money): # 转账功能
with open(r'db.txt', 'rb') as rf, \
open(r'db.txt.swap', 'wb') as wf:
while True:
usert1_msg = rf.readline().decode('utf-8')
*_, z = usert1_msg.strip().split(':')
if username1 in usert1_msg:
if int(z) > int(money):
money1 = int(z) - int(money)
data = usert1_msg.replace('{}'.format(z), '{}'.format(money1))
wf.write(data.encode('utf-8'))
else:
return '转账现金已经超过余额'
else:
wf.write('{}'.format(usert1_msg).encode('utf-8'))
if len(usert1_msg) == 0:
rf.seek(0, 0)
break
move_fuc()
with open(r'db.txt', 'rb') as rf, \
open(r'db.txt.swap', 'wb') as wf:
while True:
usert2_msg = rf.readline().decode('utf-8')
*_, z = usert2_msg.strip().split(':')
if username2 in usert2_msg:
money2 = int(z) + int(money)
data = usert2_msg.replace('{}'.format(z), '{}'.format(money2))
wf.write(data.encode('utf-8'))
else:
wf.write('{}'.format(usert2_msg).encode('utf-8'))
if len(usert2_msg) == 0:
break
move_fuc()
return '转账成功'
def cash_fuc(name,money): # 提现功能
with open(r'db.txt', 'rb') as f, \
open(r'db.txt.swap', 'wb') as wf:
while True:
cash_msg = f.readline().decode('utf-8')
if name in cash_msg:
*_ , z = cash_msg.strip().split(':')
if int(z) > int(money):
money1 = int(z) - int(money)
data = cash_msg.replace('{}'.format(z), '{}'.format(money1))
wf.write(data.encode('utf-8'))
else:
return '提现失败'
else:
wf.write('{}'.format(cash_msg).encode('utf-8'))
if len(cash_msg) == 0:
break
move_fuc()
return '提现成功'
def query_fuc(name): # 查询余额功能
with open(r'db.txt','rb') as f:
while True:
query_msg = f.readline().decode('utf-8')
if name in query_msg:
*_ , z = query_msg.strip().split(':')
return z
def move_fuc():
import os
os.remove(r'{}'.format('db.txt'))
os.rename(r'{}.swap'.format('db.txt'), r'{}'.format('db.txt'))
msg_info = {
'1': '充值功能',
'2': '转账功能',
'3': '提现功能',
'4': '查询余额功能',
}
username = input('请输入您的账号：>>').strip()
password = input('请输入您的密码：>>').strip()
tag = login(username, password)
while tag:
key_msg = '''
1: 充值功能
2: 转账功能
3: 提现功能
4: 查询余额功能
'''
print(key_msg)
cmd = input('请输入命令编号>>: ').strip()
if not cmd.isdigit():
print('必须输入命令编号的数字，傻叉')
continue
if cmd not in msg_info:
print('输入的命令不存在')
continue
if msg_info[cmd] == '充值功能':
money_inp_re = input('请输入您的充值金额：>>').strip()
res_1 = recharge_fuc(username,money_inp_re)
print(res_1.center(10,'='))
elif msg_info[cmd] == '转账功能':
username_take = input('请输入您的转账账号：>>').strip()
money_inp_tk = input('请输入您的充值金额：>>').strip()
res_2 = take_fuc(username,username_take,money_inp_tk)
print(res_2.center(10,'='))
elif msg_info[cmd] == '提现功能':
money_inp_ca = input('请输入您的提现金额：>>').strip()
res_3 = cash_fuc(username,money_inp_ca)
print(res_3.center(10,'='))
elif msg_info[cmd] == '查询余额功能':
print(query_fuc(username).center(10,'='))
