在检查用户输入时需要 Python 删除外部文件中逗号后的所有内容
Need Python to Remove everything after a comma in external file while checking user input
所以，基本上，我需要 python 代码从外部文件读取每一行并删除逗号后的所有内容。然后，它应该使用新字符串检查用户输入。
就像一个验证过程，用户注册然后代码检查用户名是否被占用
但在外部文件中，用户详细信息存储为：
'username,password'
这是我的代码：
LogFile = 'accounts.txt'
invalidUserName = False
Uusername = input("Please enter your desired username: ")
while len(Uusername) < 3 or len(Uusername) > 16:
Uusername = input("Username is not between the length of 3 and 16, please re-enter: ")
with open(LogFile) as f:
content = f.readlines()
contnt = [l.strip() for l in content if l.strip()]
passlist = []
userlist = []
for line in content:
try:
userlist.append(line.split(",")[0])
passlist.append(line.split(",")[1])
except IndexError:
pass
for username in userlist:
while username == Uusername:
Uusername = input(('Username is taken, please enter another one: '))
invalidUserName = True
if not invalidUserName:
password = input("Please enter your desired password: ")
while len(password) < 3 or len(password) > 16:
password = input("Password is not between the length of 3 and 16, please re-enter: ")
while password == username:
password = input("Password cannot be the same as the username, please re-enter: ")
VerPW = input("Please verify your password: ")
while VerPW != password:
VerPW = input("Passwords do not match, try again: ")
file = open ('accounts.txt','a')
file.write (username +','+password + "\n")
file.flush()
file.close
print ("Details stored successfully")
在第 5 行之后，我需要代码来检查外部文件中的用户名，逗号后没有任何内容，如果用户名已经存在则要求用户再次输入
list.txt:
emkay,123
alibaba,420
khanbaba,5647
naughty_princess,3242
whatthehack,657
然后：
logFile = "list.txt"
with open(logFile) as f:
content = f.readlines()
# you may also want to remove empty lines
content = [l.strip() for l in content if l.strip()]
# list to store the passwords
passList = []
# list to store the usernames
userList = []
for line in content:
userList.append(line.split(",")[0])
passList.append(line.split(",")[1])
print(userList)
print(passList)
user_inp = input("Enter a username: ")
for username in userList:
if username == user_inp:
print("Username: {}, already taken. Please try a different username".format(username))
输出：
['emkay', 'alibaba', 'khanbaba', 'naughty_princess', 'whatthehack']
['123', '420', '5647', '3242', '657']
Enter a username: naughty_princess
Username: naughty_princess, already taken. Please try a different username
编辑：
如果您希望循环在找到用户名时停止。简单地说，break离开。
for username in userList:
if username == user_inp:
print("Username: {}, already taken. Please try a different username".format(username))
break
编辑 2：
在您刚刚发布的代码中应用它，
if username == Uusername:
Uusername = ('Username is taken, please enter another one: ')
break # or use continue as it looks like you need it
编辑 3：
您的代码已修复，您需要为无效用户设置一个布尔标志，然后按以下步骤进行操作：
LogFile = 'accounts.txt'
invalidUserName = False
Uusername = input("Please enter your desired username: ")
while len(Uusername) < 3 or len(Uusername) > 16:
Uusername = input("Username is not between the length of 3 and 16, please re-enter: ")
with open(LogFile) as f:
content = f.readlines()
contnt = [l.strip() for l in content if l.strip()]
passlist = []
userlist = []
for line in content:
try:
userlist.append(line.split(",")[0])
passlist.append(line.split(",")[1])
except IndexError:
pass
print(userlist)
for username in userlist:
if username == Uusername:
print('Username is taken, please enter another one:')
invalidUserName = True
break
if not invalidUserName:
password = input("Please enter your desired password: ")
while len(password) < 3 or len(password) > 16:
password = input("Password is not between the length of 3 and 16, please re-enter: ")
while password == username:
password = input("Password cannot be the same as the username, please re-enter: ")
VerPW = input("Please verify your password: ")
while VerPW != password:
VerPW = input("Passwords do not match, try again: ")
file = open ('accounts.txt','a')
file.write (username +','+password + "\n")
file.flush()
file.close
print ("Details stored successfully")
编辑 4：
LogFile = 'accounts.txt'
invalidUserName = False
while True:
Uusername = input("Please enter your desired username: ")
while len(Uusername) < 3 or len(Uusername) > 16:
Uusername = input("Username is not between the length of 3 and 16, please re-enter: ")
with open(LogFile) as f:
content = f.readlines()
contnt = [l.strip() for l in content if l.strip()]
passlist = []
userlist = []
for line in content:
try:
userlist.append(line.split(",")[0])
passlist.append(line.split(",")[1])
except IndexError:
pass
print(userlist)
for username in userlist:
if username == Uusername:
print('Username is taken, please enter another one:')
invalidUserName = True
break
if not invalidUserName:
password = input("Please enter your desired password: ")
while len(password) < 3 or len(password) > 16:
password = input("Password is not between the length of 3 and 16, please re-enter: ")
while password == username:
password = input("Password cannot be the same as the username, please re-enter: ")
VerPW = input("Please verify your password: ")
while VerPW != password:
VerPW = input("Passwords do not match, try again: ")
file = open ('accounts.txt','a')
file.write (username +','+password + "\n")
file.flush()
file.close
print ("Details stored successfully")
exit_now = input("Press 1 to exit")
if '1' in exit_now:
break
所以，基本上，我需要 python 代码从外部文件读取每一行并删除逗号后的所有内容。然后，它应该使用新字符串检查用户输入。
就像一个验证过程，用户注册然后代码检查用户名是否被占用
但在外部文件中，用户详细信息存储为： 'username,password'
这是我的代码：
LogFile = 'accounts.txt'
invalidUserName = False
Uusername = input("Please enter your desired username: ")
while len(Uusername) < 3 or len(Uusername) > 16:
Uusername = input("Username is not between the length of 3 and 16, please re-enter: ")
with open(LogFile) as f:
content = f.readlines()
contnt = [l.strip() for l in content if l.strip()]
passlist = []
userlist = []
for line in content:
try:
userlist.append(line.split(",")[0])
passlist.append(line.split(",")[1])
except IndexError:
pass
for username in userlist:
while username == Uusername:
Uusername = input(('Username is taken, please enter another one: '))
invalidUserName = True
if not invalidUserName:
password = input("Please enter your desired password: ")
while len(password) < 3 or len(password) > 16:
password = input("Password is not between the length of 3 and 16, please re-enter: ")
while password == username:
password = input("Password cannot be the same as the username, please re-enter: ")
VerPW = input("Please verify your password: ")
while VerPW != password:
VerPW = input("Passwords do not match, try again: ")
file = open ('accounts.txt','a')
file.write (username +','+password + "\n")
file.flush()
file.close
print ("Details stored successfully")
在第 5 行之后，我需要代码来检查外部文件中的用户名，逗号后没有任何内容，如果用户名已经存在则要求用户再次输入
list.txt:
emkay,123
alibaba,420
khanbaba,5647
naughty_princess,3242
whatthehack,657
然后：
logFile = "list.txt"
with open(logFile) as f:
content = f.readlines()
# you may also want to remove empty lines
content = [l.strip() for l in content if l.strip()]
# list to store the passwords
passList = []
# list to store the usernames
userList = []
for line in content:
userList.append(line.split(",")[0])
passList.append(line.split(",")[1])
print(userList)
print(passList)
user_inp = input("Enter a username: ")
for username in userList:
if username == user_inp:
print("Username: {}, already taken. Please try a different username".format(username))
输出：
['emkay', 'alibaba', 'khanbaba', 'naughty_princess', 'whatthehack']
['123', '420', '5647', '3242', '657']
Enter a username: naughty_princess
Username: naughty_princess, already taken. Please try a different username
编辑：
如果您希望循环在找到用户名时停止。简单地说，break离开。
for username in userList:
if username == user_inp:
print("Username: {}, already taken. Please try a different username".format(username))
break
编辑 2：
在您刚刚发布的代码中应用它，
if username == Uusername:
Uusername = ('Username is taken, please enter another one: ')
break # or use continue as it looks like you need it
编辑 3：
您的代码已修复，您需要为无效用户设置一个布尔标志，然后按以下步骤进行操作：
LogFile = 'accounts.txt'
invalidUserName = False
Uusername = input("Please enter your desired username: ")
while len(Uusername) < 3 or len(Uusername) > 16:
Uusername = input("Username is not between the length of 3 and 16, please re-enter: ")
with open(LogFile) as f:
content = f.readlines()
contnt = [l.strip() for l in content if l.strip()]
passlist = []
userlist = []
for line in content:
try:
userlist.append(line.split(",")[0])
passlist.append(line.split(",")[1])
except IndexError:
pass
print(userlist)
for username in userlist:
if username == Uusername:
print('Username is taken, please enter another one:')
invalidUserName = True
break
if not invalidUserName:
password = input("Please enter your desired password: ")
while len(password) < 3 or len(password) > 16:
password = input("Password is not between the length of 3 and 16, please re-enter: ")
while password == username:
password = input("Password cannot be the same as the username, please re-enter: ")
VerPW = input("Please verify your password: ")
while VerPW != password:
VerPW = input("Passwords do not match, try again: ")
file = open ('accounts.txt','a')
file.write (username +','+password + "\n")
file.flush()
file.close
print ("Details stored successfully")
编辑 4：
LogFile = 'accounts.txt'
invalidUserName = False
while True:
Uusername = input("Please enter your desired username: ")
while len(Uusername) < 3 or len(Uusername) > 16:
Uusername = input("Username is not between the length of 3 and 16, please re-enter: ")
with open(LogFile) as f:
content = f.readlines()
contnt = [l.strip() for l in content if l.strip()]
passlist = []
userlist = []
for line in content:
try:
userlist.append(line.split(",")[0])
passlist.append(line.split(",")[1])
except IndexError:
pass
print(userlist)
for username in userlist:
if username == Uusername:
print('Username is taken, please enter another one:')
invalidUserName = True
break
if not invalidUserName:
password = input("Please enter your desired password: ")
while len(password) < 3 or len(password) > 16:
password = input("Password is not between the length of 3 and 16, please re-enter: ")
while password == username:
password = input("Password cannot be the same as the username, please re-enter: ")
VerPW = input("Please verify your password: ")
while VerPW != password:
VerPW = input("Passwords do not match, try again: ")
file = open ('accounts.txt','a')
file.write (username +','+password + "\n")
file.flush()
file.close
print ("Details stored successfully")
exit_now = input("Press 1 to exit")
if '1' in exit_now:
break