重寫在python

Question

功能我有以下的基類（代碼縮短）：

class SignupForm(GroupForm): 

    username = forms.CharField(
     label = _("Username"), 
     max_length = 30, 
     widget = forms.TextInput() 
    ) 

    def __init__(self, *args, **kwargs): 
     super(SignupForm, self).__init__(*args, **kwargs) 
     if REQUIRED_EMAIL or EMAIL_VERIFICATION or EMAIL_AUTHENTICATION: 
      self.fields["email"].label = ugettext("Email") 
      self.fields["email"].required = True 
     else: 
      self.fields["email"].label = ugettext("Email (optional)") 
      self.fields["email"].required = False 


    def after_signup(self, user, **kwargs): 
     """ 
     An extension point for subclasses. 
     """ 
     pass 

我想要做的是覆蓋after_signup()功能和username場像這樣：

class CompanySignupForm(SignupForm): 
    #TODO: override fields for company signup form 

    username = forms.CharField(
     label = _("Username TEST"), 
     max_length = 30, 
     widget = forms.TextInput() 
    ) 

    def after_signup(self, user, **kwargs): 
     """ 
     An extension point for subclasses. 
     """ 
     print str('after_signup is has been overwritten') 

我問題： 只有用戶名字段顯示所需的行爲。 after_signup()函數永遠不會被調用。而是調用基類SignupForm的after_signup()函數。我錯了什麼？

編輯：

the imports: 
from django import forms 
from django.contrib.auth.models import User 
from django.utils.translation import ugettext_lazy as _, ugettext 

實例CompanySignupForm：

url(r"^signup/$", CompanySignupForm.as_view(), name="acct_signup") 

after_signup（）從在基類的函數beeing稱爲：

def save(self, request=None): 
    # more code here 
    # ... 
    self.after_signup(new_user) 

Answer 1

使用isinstance()檢查一個實例的類型爲d .__class__以確保您正在實例化CompanySignupForm。

另外，您可能還想在CompanySignupForm上創建__init__方法，以確保它不僅僅是實例化超類。

注意：更仔細地閱讀你的編輯你不直接調用after_signup基類功能保存是正確的？如果它存在，這將會調用它的本地方法after_signup。我會拿這個函數出來的基類，並迫使它調用繼承的功能

要檢查版本運行：

signup = CompanySignupForm.as_view() 
print signup.__class__ 

url(r"^signup/$", signup, name="acct_signup")