Django View Class : name 'self' is not defined

问题

I'm working on the Django framework. Now I'm making a Class for user registration like below. I got a error on the line number 6. Could you give some help?

1: class JoinForm(forms.Form):
2:    MONTH = {
3:        1:('Jan'), 2:('Feb'), 3:('March'), 4:('Apl'), 5:('May'), 6:('Jun'),
4:        7:('July'), 8:('Aug'), 9:('Sep'), 10:('Oct'), 11:('Nov'), 12:('Dec')
5:    }
6:    YEAR = self.makeYearChoice(self,1940)
7:    email = forms.EmailField(label='Email Address', max_length=50)
8:    name = forms.CharField(label='Real Name', max_length=20)
9:    birth = forms.DateField(label='Birth Date', widget=SelectDateWidget(years=YEAR, months=MONTH))
10:   loc = forms.CharField(label='Resident Location', max_length=40)
11:   passwd = forms.CharField(label='Password', max_length=16, widget=forms.PasswordInput)

12:   def makeYearChoice(self,startYear):
13:       YEARS = ();
14:       thisYear = datetime.now().year
15:       for year in range(startYear,thisYear):
16:           YEARS.append(year)
17:       return YEARS

回答1:

This is unrelated to Django; the body of your class definition has its own namespace, and runs in the order written, so at this point:

class JoinForm(forms.Form):
    ...
    YEAR = self.makeYearChoice(self,1940)  # here
    ...

not only is self not defined, makeYearChoice isn't either! You could fix this one of two ways, either:

Move the method definition above the setting of the class attribute, and call it directly

class JoinForm(forms.Form):
    ...
    def makeYearChoice(self, startYear):  # define the method first
        ...

    YEAR = makeYearChoice(None,1940)  # don't have an instance, but who cares?
    ...

which leaves you with a redundant instance method once the class is defined; or

Make it a standalone function and just call it within the class:

def makeYearChoice(startYear):
    ...

class JoinForm(forms.Form):
    ...
    YEAR = makeYearChoice(1940)  # no fuss about self argument
    ...

I would strongly favour the latter. Also, you should read the style guide; method and attribute names are generally lowercase_with_underscores, and you should have spaces after commas.

来源：https://stackoverflow.com/questions/32069479/django-view-class-name-self-is-not-defined

标签

python

django

django-forms