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from io import TextIOWrapper


class TableForm(ModelForm):

    def clean_csv_upload(self):
        if self.cleaned_data['csv_upload']:

           # Make sure we decode the file to text
           encoding = self.cleaned_data['csv_upload'].charset if self.cleaned_data['csv_upload'].charset else 'utf-8'
           f = TextIOWrapper(self.cleaned_data['csv_upload'].file, encoding=encoding)
           csv_reader = csv.reader(f, dialect='excel')