題目要求

1、輸入用戶名和密碼后回車

2、密碼輸入錯誤，給出提示，并選擇是否重新輸入

3、密碼輸入錯誤三次后，用戶被鎖定，無法繼續登陸

構思

1、用戶輸入賬號和密碼后，需要判斷賬號是否存在

2、判斷賬號是否被禁用（錯誤次數大于三次）

3、判斷賬號密碼是否正確

4、不同的錯誤給出不同的提示

5、每輸入錯一次，文檔中的錯誤次數需要更新

6、如果三次以內用戶登陸成功，密碼原來的錯誤次數被重置

題目完成步驟

1、文檔的編寫

考慮到數據的存儲問題，決定將賬號、密碼、錯誤次數進行分行存儲，三行為一組用戶信息

2、代碼編寫

go = Truewhile go: # 用來判斷賬號是否存在 no_existence_flag = True # 用來判斷是否輸入正確 no_flag = True # 用來判斷是否已經被封 disable_flag = True # 用來判斷次數是否已經超過限制 account = input('account:') password = input('password:') # 判斷賬號是否存在（自己寫入已存在用戶的賬號密碼） file = open('C:/Users/Lenovo/Desktop/user.txt','r') # 用于拼接文本內容 file_data = '' while True: line = file.readline() if not line: break file_data += line line_content = line.strip() # 判斷是否存在賬號 if account == line_content: no_existence_flag = False true_password = file.readline() file_data += true_password true_password_content = true_password.strip() disable_flag_line = file.readline() disable_flag_num = int(disable_flag_line.strip()) # 判斷賬號是否被禁用 if disable_flag_num != 3:print('It is not disable！',disable_flag_num)disable_flag = False# 判斷密碼是否正確if password == true_password_content: no_flag = False print('Welcome in this system,{account}!'.format(account = account)) go = False disable_flag_line = disable_flag_line.replace(str(disable_flag_num),str(0)) file_data += disable_flag_lineelse: disable_flag_line = disable_flag_line.replace(str(disable_flag_num),str(disable_flag_num+1)) file_data += disable_flag_line else:file_data += file.readline() else: file_data += file.readline() file_data += file.readline() file.close() # 賬號不存在的報錯 if no_existence_flag: print('This account is not existence！') print('Do you want to try it again......') flag = input('Please input you think：') if flag == 'N': go = False continue # 賬號被禁用的報錯 if disable_flag: print('You account is disable,please go home by youself!') print('Do you want to try it again......') flag = input('Please input you think：') if flag == 'N': go = False continue # 賬號密碼錯誤的報錯 if no_flag: file = open('C:/Users/Lenovo/Desktop/user.txt','w') print(file_data) file.write(file_data) file.close() print('Your password is not right，please try it again!') print('Do you want to try it again......') flag = input('Please input you think：') if flag == 'N': go = False # 重置輸入次數 else: file = open('C:/Users/Lenovo/Desktop/user.txt','w') print(file_data) file.write(file_data) file.close()

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