Python，數據庫密碼

Question

我正在做類的簡單數據庫，我有密碼功能的問題。我無法弄清楚爲什麼它每次都要求設置密碼。我認爲問題在於閱讀是否已經在基礎之內，但我不知道如何解決。

import shelve 
global base,pas 
global magazine_base 
def load_data(): 
    global base 
    global magazine_base 
    magazine_base = shelve.open('magazine_base') 
    if magazine_base.has_key('base'): 
     base = magazine_base['base'] 
     if not base: 
      base = [] 
    else: 
     base = [] 
     magazine_base['base'] = base 

def enterpass(): 
    global base,pas 
    epas=raw_input("Enter password to acces database") 
    for entry in base: 
     while True: 
      if epas == entry['pas']: 

       break 
      else: 
       print "Password incorrect" 

def password(): 
    global base,pas 
    global magazine_base 
    load_data() 

    is_firstopen = True 

    if 'pas' in base: 
     is_firstopen = False 
     enterpass() 
    if is_firstopen: 
     while True: 
      pas=raw_input("This is the first start of database.\nPlease enter the password, min. 5 characters: ") 
      if len(pas)>5: 
       break 
       base += [{'pas':pas}] 
       magazine_base['base'] = base 
       magazine_base.close() 
       print "Password set" 
      else: 
       print "Password too short" 

Answer 1

您有提示要求在無限循環中輸入密碼。

Answer 2

讓我們看一下這個功能：

def enterpass(): 
    global base,pas 
    epas=raw_input("Enter password to acces database") 
    for entry in base: 
     while True: 
      if epas == entry['pas']: 
       break 
      else: 
       print "Password incorrect" 

顯然，基礎是包含條目的列表。每個條目將是一個有'pas'鍵的字典。如果'pas'條目與用戶密碼匹配，則密碼有效。我認爲如果沒有匹配的密碼是錯誤的。這是不是代碼做什麼，但它試一下：

import sys 

def enter_password(base): 
    """Prompt the user for a password, and validate it against the 
    passwords stored in the entries in base. Permit three tries 
    before terminating the application.""" 

    from getpass import getpass 

    for tries in range(3): 
     userpw = getpass("Enter password to access database: ") 

     for entry in base: 
      if entry['pas'] == userpw: 
       return 

     print "\nInvalid password!\n" 

    print "\nToo many failed password attempts. Goodbye!" 
    sys.exit(1) 

你可以這樣調用它：

enter_password(base)