MemoryError zipfile in memory

Question

I'm getting MemoryError (out of memory) when zipping files in memory with Python. I'm using cStringIO.StringIO as an in memory buffer stream. Follow the code below:

    zip_file = cStringIO.StringIO()
    with zipfile.ZipFile(file=zip_file, mode='w', compression=zipfile.ZIP_DEFLATED) as zf:
        for f in files:
            zf.writestr(f.file_name, f.get_data())
        for f in images:
            try:
                zf.writestr(str(f.name), f.read())
            except:
                pass

    files_email.append({
        'clinic_name': clinic.name,
        'url': send_to_s3(zip_file, file_name, 60 * 60 * 48),
    })
    zip_file.close()

Any idea on how can I fix it?