如何解決這個錯誤在Django - 未定義的變量：etree

Question

我是一個noobs :)我試圖使用@Rune在這篇文章In a django form, How to make a field readonly (or disabled) so that it cannot be edited?答案之一，但我有一個錯誤，如標題中所述。

任何人都可以幫助我。我曾嘗試使用

從LXML進口etree - 得到錯誤未解決進口：etree

這

從xml.etree進口的ElementTree作爲etree - 擺脫錯誤未定義的變量進口：formstring

編碼

class ReadOnlyWidget(forms.Select): 

def __init__(self, initial_widget, *args, **kwargs): 
    self.initial_widget = initial_widget 
    super(ReadOnlyWidget, self).__init__(*args, **kwargs) 

def render(self, *args, **kwargs): 
    def guess_readonly_text(original_content): 
     root = etree.formstring("<span>%s</span>" % original_content) 

     for element in root: 
      if element.tag == 'input': 
       return element.get('value') 

      if element.tag == 'select': 
       for option in element: 
        if option.get('selected'): 
         return option.text 

      if element.tag == 'textarea': 
       return element.text 

     return "N/A" 

    original_content = self.initial_widget.render(*args, **kwargs) 
    try: 
     readonly_text = self.initial_widget.render_readonly(*args, **kwargs) 
    except AttributeError: 
     readonly_text = guess_readonly_text(original_content) 

    return mark_safe("""<span class="hidden">%s</span>%s""" %(original_content, readonly_text)) 

預先感謝您。

Answer 1

它應該是fromstring而不是formstring。