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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 keypair_add(self, name, pubfile=None, pubkey=None):
        '''
        Add a keypair
        '''
        nt_ks = self.compute_conn
        if pubfile:
            with salt.utils.files.fopen(pubfile, 'r') as fp_:
                pubkey = salt.utils.stringutils.to_unicode(fp_.read())
        if not pubkey:
            return False
        nt_ks.keypairs.create(name, public_key=pubkey)
        ret = {'name': name, 'pubkey': pubkey}
        return ret