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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 write(self, fptr):
 """Write a JPEG 2000 Signature box to file. """

        fptr.write(struct.pack('>I4s', 12, b'jP  '))
        fptr.write(struct.pack('>BBBB', *self.signature))