I'm trying to make my own phone number form, and I'm having trouble with 
number validation. 

Since international numbers can use "(40) (30)" I want to check that only 
numbers were entered. I can't seem to make it work though.

def clean_international(self):
        data = self.cleaned_data['international']
        # Take off ()
        dataless = data.strip('() ')
         
        if dataless.isdigit() != True:
            raise ValidationError(_('Invalid number'))
        
        return data

This always raises an error. Any suggestions? Thanks!

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