Question

Guest = {}
with open('LogIn.txt') as f:
    credentials = [x.strip().split(':') for x in f.readlines()]
    for username,password in credentials:
        Guest[username] = password
def DelUser():
    DB = open('LogIn.txt',"r+")
    username = DB.read()
    delete = raw_input("Input username to delete: ")
    if delete in username:
        <insert code to remove line containing username:password combination>

所以，我有一个LogIn.txt文件，其中包含以下用户名：密码组合：

chris:test
char:coal
yeah:men
test:test
harhar:lololol

我想在对象“删除”中删除我想要的用户名：密码组合但问题是，如果我使用

if delete in username:

论点，它也必须考虑密码。例如，如果我有两个帐户使用相同的密码怎么办？或者像上面那样。我可以采取什么样的路径？或者我在这里遗漏了什么？

Answer 1

使用

if delete in Guest:

测试delete中的Guest是否为Guest。由于if delete in Guest的密钥代表用户名，delete会测试import fileinput import sys def DelUser(Guest): delete = raw_input("Input username to delete: ") for line in fileinput.input(['LogIn.txt'], inplace = True, backup = '.bak'): if delete not in Guest: sys.stdout.write(line)是否为用户名。

您可以使用fileinput模块重写“inplace”文件：

{{1}}

Answer 2

根据您当前的DelUser功能，您可以读取该文件，删除以用户删除的行，并写一个新文件：

def DelUser():

    # read the current files, and get one line per user/password
    with open('LogIn.txt',"r+") as fd:
        lines = fd.readlines()

    # ask the user which one he want to delete
    delete = raw_input("Input username to delete: ")

    # filter the lines without the line starting by the "user:"
    lines = [x for x in lines if not x.startswith('%s:' % delete)]

    # write the final file
    with open('LogIn.txt', 'w') as fd:
        fd.writelines(lines)

删除用户名，而不是通过文本文件中的密码

2 个答案: