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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def verify_exif(filename):
    '''
    Check that image file has the required EXIF fields.
    Incompatible files will be ignored server side.
    '''
    # required tags in IFD name convention
    required_exif = required_fields()
    exif = ExifRead(filename)
    required_exif_exist = exif.fields_exist(required_exif)
    return required_exif_exist