題目要求

1、輸入用戶名和密碼后回車

2、密碼輸入錯(cuò)誤，給出提示，并選擇是否重新輸入

3、密碼輸入錯(cuò)誤三次后，用戶被鎖定，無(wú)法繼續(xù)登陸

構(gòu)思

1、用戶輸入賬號(hào)和密碼后，需要判斷賬號(hào)是否存在

2、判斷賬號(hào)是否被禁用（錯(cuò)誤次數(shù)大于三次）

3、判斷賬號(hào)密碼是否正確

4、不同的錯(cuò)誤給出不同的提示

5、每輸入錯(cuò)一次，文檔中的錯(cuò)誤次數(shù)需要更新

6、如果三次以內(nèi)用戶登陸成功，密碼原來(lái)的錯(cuò)誤次數(shù)被重置

題目完成步驟

1、文檔的編寫

考慮到數(shù)據(jù)的存儲(chǔ)問題，決定將賬號(hào)、密碼、錯(cuò)誤次數(shù)進(jìn)行分行存儲(chǔ)，三行為一組用戶信息

2、代碼編寫

go = Truewhile go: # 用來(lái)判斷賬號(hào)是否存在 no_existence_flag = True # 用來(lái)判斷是否輸入正確 no_flag = True # 用來(lái)判斷是否已經(jīng)被封 disable_flag = True # 用來(lái)判斷次數(shù)是否已經(jīng)超過限制 account = input('account:') password = input('password:') # 判斷賬號(hào)是否存在（自己寫入已存在用戶的賬號(hào)密碼） file = open('C:/Users/Lenovo/Desktop/user.txt','r') # 用于拼接文本內(nèi)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(hào) 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(hào)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(hào)不存在的報(bào)錯(cuò) 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(hào)被禁用的報(bào)錯(cuò) 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(hào)密碼錯(cuò)誤的報(bào)錯(cuò) 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(shù) else: file = open('C:/Users/Lenovo/Desktop/user.txt','w') print(file_data) file.write(file_data) file.close()

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