Validate that an uploaded file is a PDF

gistfile1.py

# Django: validate that an uploaded file is a valid PDF

import pyPdf # from http://pybrary.net/pyPdf/
from pyPdf.utils import PdfReadError

class DocumentForm(forms.ModelForm):
    pdf = forms.FileField()
    class Meta:
        model = Document
    
    def clean_pdf(self):
        file = self.cleaned_data['pdf']
        try:
            pdf = pyPdf.PdfFileReader(file)
        except PdfReadError:
            raise forms.ValidationError, 'You must upload a valid PDF file'
        print pdf.documentInfo
        return file

There is a way to know if pdf it's a pdf/A?

There is a way to know if pdf it's a pdf/A?

I need the same!!