Re: Newbie django/python with C++ background wants enums

A different way would be to define constants:

YES = 'Y'
NO = 'N'

TO_USE= (
(YES, 'Yes'),
(NO, 'No'),
)

-----------

from myapp.models import YES

class XForm(forms.ModelForm):
def clean(self):
cleaned_data=super(XForm, self).clean()
txt= cleaned_data['txt'].strip()
use_txt=cleaned_data['use_txt'].strip()

if txt.__len__()==0 and use_txt == YES:
raise forms.ValidationError('This is needed!')

return cleaned_data

On Feb 1, 4:45 pm, NENAD CIKIC <nenad.ci...@gmail.com> wrote:
> Hello, the subject expresses my discomfort with certain python
> characteristics, given my background, and my lack of python knowledge.
> Specifically lets say that I have a model with a Text field and char field.
> The char field is length 1 and says "use or do not use the text field". The
> char field can have Y or N values.
> So using the admin interface I wanted to override the clean method but I
> did not want to write
> if text.__len__==0 and char=='Y':
>   raise exception
>
> In C/C++ you would use enum for these sort of things. So I ended with
> defining in models.py something as:
> TO_USE= (
>     ('Y', 'Yes'),
>     ('N', 'No'),
>     )
>
> class X(models.Model):
>     txt= models.CharField(db_index=True,null=True, blank=True,max_length=30)
>     use_txt=
> models.CharField(blank=False,max_length=1,default='D',choices=TO_USE)
>
> and in admin.py something as
> class XForm(forms.ModelForm):
>     def clean(self):
>         cleaned_data=super(XForm, self).clean()
>         txt= cleaned_data['txt'].strip()
>         use_txt=cleaned_data['use_txt'].strip()
>
>         if txt.__len__()==0 and use_txt==TO_USE.__getitem__(0)[0]:
>             raise forms.ValidationError('This is needed!')
>
>         return cleaned_data
>
> The part .__getitem__(0)[0] is not very readable. I have looked for enums
> in python, and if I have understood well, it seems they are not implemented.
> What is the best way to do it in python for my problem, given that I do not
> want to write =='Y'.
> Thanks
> Nenad

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