運(yùn)行代碼時(shí)出現(xiàn)邏輯錯(cuò)誤，它繼續(xù)拋出第一個(gè) if 語句錯(cuò)誤“錯(cuò)誤！用戶名不存在?！?我需要能夠以管理員身份登錄，然后通過將用戶添加到 .txt 文件來添加用戶，之后，如果程序再次運(yùn)行，我可以通過管理員或在 txt 中創(chuàng)建的新用戶之一登錄文件。我似乎無法正確拆分它，以便循環(huán)在登錄時(shí)正確地遍歷列表。例子：print(new_lines) = [['admin', 'adm1n'], ['kevin', 'kev1n'], ['dorothy', '1234']].txt 文件內(nèi)容，每個(gè)條目在新行 = admin,adm1n\n kevin,kev1n\n dorothy,1234到目前為止的代碼：import time#User input of username and passworduser_name = input("Username:\n")user_pass = input("Password: \n")#Opening documentwith open("user.txt", "r+", encoding = "utf-8-sig") as f: new_lines = [] for line in f: new_line = line.strip() new_lines.append(new_line.split(",")) print(new_lines) #Loop to enter user name and password for x in new_lines: for y in x: if user_name != new_lines[:][0]: print("Error! Username does not exist.") user_name = input("Username:\n") user_pass = input("Password: \n") elif user_pass != new_lines[:][1]: print("Error! Incorrect password.") user_name = input("Username:\n") user_pass = input("Password: \n") else: print("Welcome back!") break break #User options to choose from user_choice = input("""\nPlease select one of the following options: \nr - register user \na - add task \nva - view all tasks \nvm - view my tasks \ne - exit \nAnswer: """)
2 回答
qq_遁去的一_1
TA貢獻(xiàn)1725條經(jīng)驗(yàn) 獲得超8個(gè)贊
我建議稍微重新格式化代碼，以便更容易找到用戶名是否存在以及密碼是否正確。
import time
#User input of username and password
user_name = input("Username:\n")
user_pass = input("Password: \n")
#Opening document
with open("user.txt", "r+", encoding = "utf-8-sig") as f:
new_lines = []
for line in f:
new_line = line.strip()
new_lines.append(new_line.split(","))
usernames = [acc[0] for acc in new_lines]
pws = [acc[1] for acc in new_lines]
while True:
if user_name not in usernames:
print("Error! Username does not exist.")
user_name = input("Username:\n")
user_pass = input("Password: \n")
else:
pw_index = usernames.index(user_name)
if user_pass != pws[pw_index]:
print("Error! Incorrect password.")
user_name = input("Username:\n")
user_pass = input("Password: \n")
else:
print("Welcome back!")
break
#User options to choose from
user_choice = input("""\nPlease select one of the following options:
\nr - register user
\na - add task
\nva - view all tasks
\nvm - view my tasks
\ne - exit
\nAnswer: """)
慕妹3146593
TA貢獻(xiàn)1820條經(jīng)驗(yàn) 獲得超9個(gè)贊
你在循環(huán)中有一個(gè)邏輯錯(cuò)誤 - 你似乎將文本文件中的每一行與提供的用戶名和密碼進(jìn)行比較，如果它們不匹配則說明錯(cuò)誤 - 忽略用戶可能不在第一行的事實(shí)文件。僅當(dāng)您遍歷整個(gè)文件但未找到用戶，或找到用戶但密碼不匹配時(shí)，才會(huì)顯示該錯(cuò)誤。
另外，我認(rèn)為您根本不需要內(nèi)部循環(huán)，您聲明了 x 和 y 但不使用它們，您是否嘗試過打印它們并檢查它們包含的內(nèi)容？
無論如何，這是我認(rèn)為循環(huán)應(yīng)該是什么樣子的輪廓
found = False
for current_user, current_password in new_lines:
if current_user == user_name:
if current_password == user_pass:
print("Welcome back!")
found = True
else:
print("Error! Incorrect password")
break
if not found:
print("Error! Username does not exist.")
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