How to use the blockcypher.api.create_unsigned_tx function in blockcypher

wallet_obj=wallet_obj,
                    num_addrs=1,
                    )[0]['pub_address']

    if not tx_preference:
        tx_preference = txn_preference_chooser(user_prompt=DEFAULT_PROMPT)

    verbose_print('Inputs:')
    verbose_print(inputs)
    verbose_print('Outputs:')
    verbose_print(outputs)
    verbose_print('Change Address: %s' % change_address)
    verbose_print('coin symbol: %s' % coin_symbol)
    verbose_print('TX Preference: %s' % tx_preference)

    unsigned_tx = create_unsigned_tx(
        inputs=inputs,
        outputs=outputs,
        change_address=change_address,
        preference=tx_preference,
        coin_symbol=coin_symbol,
        api_key=BLOCKCYPHER_API_KEY,
        # will verify in the next step,
        # that way if there is an error here we can display that to user
        verify_tosigntx=False,
        include_tosigntx=True,
        )

    verbose_print('Unsigned TX:')
    verbose_print(unsigned_tx)

    if 'errors' in unsigned_tx:

wallet_obj=wallet_obj,
                    num_addrs=1,
                    )[0]['pub_address']

    if not tx_preference:
        tx_preference = txn_preference_chooser(user_prompt=DEFAULT_PROMPT)

    verbose_print('Inputs:')
    verbose_print(inputs)
    verbose_print('Outputs:')
    verbose_print(outputs)
    verbose_print('Change Address: %s' % change_address)
    verbose_print('coin symbol: %s' % coin_symbol)
    verbose_print('TX Preference: %s' % tx_preference)

    unsigned_tx = create_unsigned_tx(
        inputs=inputs,
        outputs=outputs,
        change_address=change_address,
        preference=tx_preference,
        coin_symbol=coin_symbol,
        api_key=BLOCKCYPHER_API_KEY,
        # will verify in the next step,
        # that way if there is an error here we can display that to user
        verify_tosigntx=False,
        include_tosigntx=True,
        )

    verbose_print('Unsigned TX:')
    verbose_print(unsigned_tx)

    if 'errors' in unsigned_tx:

'address': pkey_addr,
            }, ]
    verbose_print('Inputs:\n%s' % inputs)

    dest_addr = get_unused_receiving_addresses(
            wallet_obj=wallet_obj,
            num_addrs=1,
            )[0]['pub_address']

    outputs = [{
            'address': dest_addr,
            'value': -1,  # sweep value
            }, ]
    verbose_print('Outputs:\n%s' % outputs)

    unsigned_tx = create_unsigned_tx(
        inputs=inputs,
        outputs=outputs,
        change_address=None,
        coin_symbol=coin_symbol,
        api_key=BLOCKCYPHER_API_KEY,
        # will verify in the next step,
        # that way if there is an error here we can display that to user
        verify_tosigntx=False,
        include_tosigntx=True,
        )
    verbose_print('Unsigned TX:')
    verbose_print(unsigned_tx)

    if 'errors' in unsigned_tx:
        puts(colored.red('TX Error(s): Tx NOT Signed or Broadcast'))
        for error in unsigned_tx['errors']:

'address': pkey_addr,
            }, ]
    verbose_print('Inputs:\n%s' % inputs)

    dest_addr = get_unused_receiving_addresses(
            wallet_obj=wallet_obj,
            num_addrs=1,
            )[0]['pub_address']

    outputs = [{
            'address': dest_addr,
            'value': -1,  # sweep value
            }, ]
    verbose_print('Outputs:\n%s' % outputs)

    unsigned_tx = create_unsigned_tx(
        inputs=inputs,
        outputs=outputs,
        change_address=None,
        coin_symbol=coin_symbol,
        api_key=BLOCKCYPHER_API_KEY,
        # will verify in the next step,
        # that way if there is an error here we can display that to user
        verify_tosigntx=False,
        include_tosigntx=True,
        )
    verbose_print('Unsigned TX:')
    verbose_print(unsigned_tx)

    if 'errors' in unsigned_tx:
        puts(colored.red('TX Error(s): Tx NOT Signed or Broadcast'))
        for error in unsigned_tx['errors']: