作业
2020-6-15
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 edit_file(src, old_content, new_content):
import os
if os.path.isfile(src):
with open(src, mode='rt', encoding='utf-8') as f:
f = f.read()
data = f.replace(old_content, new_content)
with open(src, mode='wt', encoding='utf-8') as f:
f.write(data)
else:
print('文件不存在!')
2、编写tail工具
def tailf_ (file):
import os, time
if os.path.isfile(file):
with open(file, mode='rb') as f:
while True:
f.seek(0, 2)
line = f.readline()
if line:
print(line.decode('utf-8'))
tailf_("/var/log/messages")
3、编写登录功能
def read_db():
'''
这个是用来读取文件数据库
'''
l = []
with open(r'db.txt', mode='rt', encoding='utf-8') as f:
print(f)
for line in f:
name, pwd = line.strip('\n').split(':')
l.append(name)
return l
def login():
'''
这个是登录程序
'''
name = input('请输入你的用户名:')
pwd = input("请输入你的密码:")
if name not in read_db():
print('你输入的用户名不存在！dSB一个')
else:
with open(r'db.txt', mode='rt', encoding='utf-8') as f:
for line in f:
name_, pwd_ = line.strip('\n').split(':')
if name == name_ and pwd == pwd_:
print('登录成功')
return 0
else:
print('密码错误!')
4、编写注册功能
def read_db():
'''
读取数据库
'''
l = []
with open(r'db.txt', mode='rt', encoding='utf-8') as f:
print(f)
for line in f:
name, _ = line.strip('\n').split(':')
l.append(name)
return l
def register():
'''
注册用户
'''
name_f = input('请输入你的账户:').strip('}{|\\\t\n.*&^!@#$% ')
pwd_f = input("请输入你的密码:").strip('}{|\\\t\n.*&^!@#$% ')
name_n = input('请再次输入你的账户:').strip('}{|\\\t\n.*&^!@#$% ')
pwd_n = input("请再次输入你的密码:").strip('}{|\\\t\n.*&^!@#$% ')
res = read_db()
print(res)
if name_f in res:
print('此用户被注册过')
else:
if name_f == name_n and pwd_f == pwd_n:
with open(r'db.txt', mode='at', encoding="utf-8") as f:
f.write('%s:%s\n' % (name_f, pwd_f))
print("注册成功")
else:
print("注册失败!dsb一个")
5、编写用户认证功能
def auth():
inp_name = input('请输入你的用户名:')
inp_pwd = input("请输入你的密码:")
with open(r'db.txt',mode='rt', encoding='utf-8') as f:
for line in f:
name,pwd=line.strip('\n').split(':')
if name == inp_name and pwd == inp_pwd:
print("用户登录成功")
retun 'sucess'
else:
pirnt('用户名或则密码错误!')
这个题目与第三题没区别吧? [<>V<>]
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
选做题中的选做题：登录功能
用户登录成功后，内存中记录下该状态，上述功能以当前登录状态为准，必须先登录才能操作
def read_db():
'''
这个是用来读取文件数据库
'''
l = []
with open(r'db.txt', mode='rt', encoding='utf-8') as f:
print(f)
for line in f:
name, pwd = line.strip('\n').split(':')
l.append(name)
return l
def login():
'''
这个是登录程序
'''
name = input('请输入你的用户名:')
pwd = input("请输入你的密码:")
if name not in read_db():
print('你输入的用户名不存在！dSB一个')
else:
with open(r'db.txt', mode='rt', encoding='utf-8') as f:
for line in f:
name_, pwd_ = line.strip('\n').split(':')
if name == name_ and pwd == pwd_:
print('登录成功')
return 0, name
else:
print('密码错误!')
return 'error', 101
def chaxun(name): # 查询功能
with open(r'info.txt',encoding='utf-8',mode='rt') as f:
for line in f:
# line = line.strip()
# print(len(line))
try:
data = eval(line)
except SyntaxError:
pass
if data.get(name,0):
# print(type(data))
msg = """
用户:{0}
余额:{1}
""".format(name, data[name])
print(msg)
# chaxun('egon')
def chongzhi(name): # 充值功能
chaxun(name)
money = int(input("请充值多少钱:"))
import os,time
with open(r'info.txt',encoding='utf-8',mode='rt') as f_r,open(r'.info.txt',encoding='utf-8',mode='wt') as f_w:
for line in f_r:
try:
r_data = eval(line)
except SyntaxError:
pass
if name and r_data.get(name, 0):
r_data[name] += money
str_data = str(r_data)
line = line.replace(line,str_data)
f_w.write(line+'\n')
f_r.close() # 这个写的有点bug如果不加上就会产生文件占用问题
f_w.close()
time.sleep(2)
os.remove('info.txt')
os.rename('.info.txt','info.txt')
chaxun(name)
# chongzhi('egon')
#
def tixian(name):
chaxun(name)
money = int(input("提现多少钱:"))
import os,time
with open(r'info.txt',encoding='utf-8',mode='rt') as f_r,open(r'.info.txt',encoding='utf-8',mode='wt') as f_w:
for line in f_r:
try:
r_data = eval(line)
except SyntaxError:
pass
if name and r_data.get(name, 0):
if r_data[name] < money:
r_data[name] -= money
str_data = str(r_data)
line = line.replace(line,str_data)
f_w.write(line+'\n')
else:
pass
# f_w.write(line)
f_r.close() # 这个写的有点bug如果不加上就会产生文件占用问题
f_w.close()
time.sleep(2)
os.remove('info.txt')
os.rename('.info.txt','info.txt')
chaxun(name)
res, name = login()
print(res)
if res == 0:
flag = True
while flag:
msg = """
下面是银行操作:请输入数字
1:充值功能
2:转账功能
3:提现功能
4:查询功能
5:退出银行
"""
print(msg)
res = input('请输入数字:').strip('')
if not res.isdigit():
continue
elif int(res) == 1:
chongzhi(name)
# chaxun(name)
elif int(res) == 2:
pass
elif int(res) == 3:
tixian(name)
elif int(res) == 4:
chaxun(name)
elif int(res) == 5:
flag=False
break
else:
print('密码或者用户名错误')
