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我正在使用 re 库通过正则表达式验证电话号码，并且我之前在其他项目上使用过相同的确切代码，它运行良好，但现在我得到了

“NoneType”对象没有“匹配”属性

模型.py

from django.core.exceptions import ValidationError
import re

def validate_phone(value): #the validation regex here to be used in models later
    if re.match('^(010|011|012)[0-9]{8}',value) is None :
        raise ValidationError(u'%s is not a valid number' % value)
    if UserProfile.objects.filter(phone_number=value).count() > 1:
        raise ValidationError("Phone number already exists")

class UserProfile(User):
    #.... some other attributes
    mobile_number = models.CharField(validators=[validate_phone],null=True, blank=True, unique=True,max_length=16)

当我尝试从管理员更改手机号码进行测试时，我收到此错误：

Traceback:
File "/Library/Python/2.7/site-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/options.py" in wrapper
  366.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  91.                     response = view_func(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  89.         response = view_func(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/sites.py" in inner
  196.             return view(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in _wrapper
  25.             return bound_func(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  91.                     response = view_func(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in bound_func
  21.                 return func(self, *args2, **kwargs2)
File "/Library/Python/2.7/site-packages/django/db/transaction.py" in inner
  209.                 return func(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/options.py" in change_view
  1035.             if form.is_valid():
File "/Library/Python/2.7/site-packages/django/forms/forms.py" in is_valid
  124.         return self.is_bound and not bool(self.errors)
File "/Library/Python/2.7/site-packages/django/forms/forms.py" in _get_errors
  115.             self.full_clean()
File "/Library/Python/2.7/site-packages/django/forms/forms.py" in full_clean
  272.         self._post_clean()
File "/Library/Python/2.7/site-packages/django/forms/models.py" in _post_clean
  326.             self.instance.clean_fields(exclude=exclude)
File "/Library/Python/2.7/site-packages/django/db/models/base.py" in clean_fields
  844.                 setattr(self, f.attname, f.clean(raw_value, self))
File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py" in clean
  201.         self.run_validators(value)
File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py" in run_validators
  154.                 v(value)
File "/Users/fadykamal/Work/Projects/Django/ShoghlanahProject/shoghlanah/models.py" in validate_phone
  23.     if re.match('^(010|011|012)[0-9]{8}',value) is None :

Exception Type: AttributeError at /admin/shoghlanah/userprofile/2/
Exception Value: 'NoneType' object has no attribute 'match'
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