Creating An Application Using BigchainDB in Python

To use BigchainDB we need to install BigchainDB driver for this command
pip3 install -U bigchaindb-driver
To connect with BigchainDB we use url that is
bdb_root_url = 'http://localhost:9984'  # this is your local set up BigchainDb url

If you have not set up Bigchaindb locally then you can use BigchainDB testnet url that is
bdb_root_url = ‘https://test.bigchaindb.com’     # this is testnet url of BigchainDB
If we use testnet url then we will pass 
App_id & app_key that we will find after signup on url 
https://testnet.bigchaindb.com/
2. To connect with BigchainDB 
We will import this class
from bigchaindb_driver import BigchainDB 
Add appi_id & app_key in header of url like this
bdb = BigchainDB(
    'https://test.bigchaindb.com',
    headers={'app_id': 'da9c76b6'
             'app_key': '34f1acaf209503732a3521afb184560a'})
3. Create private key & public key.
Import this class to create private key & public key
from bigchaindb_driver.crypto import generate_keypair
& create by this method
user1, user2 = generate_keypair(), generate_keypair()

3. Code of creating asset .

from bigchaindb_driver import BigchainDB
from bigchaindb_driver.crypto import generate_keypair

user1, user2 = generate_keypair(), generate_keypair()

bdb = BigchainDB(
    'https://test.bigchaindb.com',
    headers={'app_id': 'da9c76b6',
             'app_key': '34f1acaf209503732a3521afb184560a'})
Test_asset = {
    'data': {
        'test22': {
            'serial_number': 'abcd123412',
            'manufacturer': 'bkfabahr'
        },
    },
}

Test_asset_metadata = {
    'country': 'india'
}

prepared_creation_tx = bdb.transactions.prepare(
    operation='CREATE',
    signers=user1.public_key,
    asset=Test_asset,
    metadata=Test_asset_metadata
)

fulfilled_creation_tx = bdb.transactions.fulfill(
    prepared_creation_tx,
    private_keys=user1.private_key
)

sent_creation_tx = bdb.transactions.send_commit(fulfilled_creation_tx)
print('create')
print(sent_creation_tx)
txid = fulfilled_creation_tx['id']

b = bdb.transactions.get(asset_id=txid)
print('b')
print(b)
Response-> after successfull run code
create
{'asset': {'data': {'bicycle': {'manufacturer': 'bkfab', 'serial_number': 'abcd1234'}}}, 'id': 'd7fb62d90f1c67861e520cffeb6e7c6a62ed3b7ba335ebfc784c8baba46592a0', 'inputs': [{'fulfillment': 'pGSAIIg31Ki3DZbYOAZMnBmVgV0-hfy_xeDiz9d83I6jBmxagUBKbgqZksjvhMAeyGPSHNDnIjBqmgM8qVdy641Z0PQNB27dbZNYsnGac2fgzkZxXyDx6YqBx1WNCG-wT8BCTokL', 'fulfills': None, 'owners_before': ['AAjpnRqzJRhS8xpQsXNLV1hdaB8gUwgE41qJhinfGtqw']}], 'metadata': {'planet': 'earth'}, 'operation': 'CREATE', 'outputs': [{'amount': '1', 'condition': {'details': {'public_key': 'AAjpnRqzJRhS8xpQsXNLV1hdaB8gUwgE41qJhinfGtqw', 'type': 'ed25519-sha-256'}, 'uri': 'ni:///sha-256;oFneJQzJm7Nq5k786xXdDRUCd-48WFQ1HLlkyojar3M?fpt=ed25519-sha-256&cost=131072'}, 'public_keys': ['AAjpnRqzJRhS8xpQsXNLV1hdaB8gUwgE41qJhinfGtqw']}], 'version': '2.0'}
4. Transfer Asset ownership.
We are transfer previously created transaction 
transfer_asset = {
    'id': asset_id
}

output_index = 0
output = fulfilled_creation_tx['outputs'][output_index]

transfer_input = {
    'fulfillment': output['condition']['details'],
    'fulfills': {
        'output_index': output_index,
        'transaction_id': fulfilled_creation_tx['id']
    },
    'owners_before': output['public_keys']
}

prepared_transfer_tx = bdb.transactions.prepare(
    operation='TRANSFER',
    asset=transfer_asset,
    inputs=transfer_input,
    recipients=user2.public_key,
)

fulfilled_transfer_tx = bdb.transactions.fulfill(
    prepared_transfer_tx,
    private_keys=alice.private_key,
)

sent_transfer_tx = bdb.transactions.send_commit(fulfilled_transfer_tx)

print('sent_transfer_tx')
print(sent_transfer_tx)
 Response are like this of transfer asset ->
{'asset': {'id': 'd7fb62d90f1c67861e520cffeb6e7c6a62ed3b7ba335ebfc784c8baba46592a0'}, 'id': '0ee2929a01e949fe051d1cfaaa643556e6f5caef5d9fb932dae241a9efe98f65', 'inputs': [{'fulfillment': 'pGSAIIg31Ki3DZbYOAZMnBmVgV0-hfy_xeDiz9d83I6jBmxagUB3Lj4-f5VhdYkiMLuWDrUhctY-_wQVvOcCdtLy0o7zaMGl-rPmx8k0wK0WXdz-24gkOqqDkJh9fp8uB7RQkNIB', 'fulfills': {'output_index': 0, 'transaction_id': 'd7fb62d90f1c67861e520cffeb6e7c6a62ed3b7ba335ebfc784c8baba46592a0'}, 'owners_before': ['AAjpnRqzJRhS8xpQsXNLV1hdaB8gUwgE41qJhinfGtqw']}], 'metadata': None, 'operation': 'TRANSFER', 'outputs': [{'amount': '1', 'condition': {'details': {'public_key': '7STQGzddjH2RiiQEedxatVuoi7CqV7NbPPWRxaubaTke', 'type': 'ed25519-sha-256'}, 'uri': 'ni:///sha-256;JpyXA6_WsPe-MEyBTchq0XVGsqBR_BnmF1fZI0PD8Qc?fpt=ed25519-sha-256&cost=131072'}, 'public_keys': ['7STQGzddjH2RiiQEedxatVuoi7CqV7NbPPWRxaubaTke']}], 'version': '2.0'}
5. Get transaction details
Code of get transaction details
from bigchaindb_driver import BigchainDB
from bigchaindb_driver.crypto import generate_keypair

bdb = BigchainDB(
    'https://test.bigchaindb.com',
    headers={'app_id': 'da9c76b6',
             'app_key': '34f1acaf209503732a3521afb184560a'})




print('txid')

b = bdb.transactions.get(asset_id='d7fb62d90f1c67861e520cffeb6e7c6a62ed3b7ba335ebfc784c8baba46592a0')
print('b')
print(b)
Response are like this
[{'inputs': [{'owners_before': ['AAjpnRqzJRhS8xpQsXNLV1hdaB8gUwgE41qJhinfGtqw'], 'fulfills': None, 'fulfillment': 'pGSAIIg31Ki3DZbYOAZMnBmVgV0-hfy_xeDiz9d83I6jBmxagUBKbgqZksjvhMAeyGPSHNDnIjBqmgM8qVdy641Z0PQNB27dbZNYsnGac2fgzkZxXyDx6YqBx1WNCG-wT8BCTokL'}], 'outputs': [{'public_keys': ['AAjpnRqzJRhS8xpQsXNLV1hdaB8gUwgE41qJhinfGtqw'], 'condition': {'details': {'type': 'ed25519-sha-256', 'public_key': 'AAjpnRqzJRhS8xpQsXNLV1hdaB8gUwgE41qJhinfGtqw'}, 'uri': 'ni:///sha-256;oFneJQzJm7Nq5k786xXdDRUCd-48WFQ1HLlkyojar3M?fpt=ed25519-sha-256&cost=131072'}, 'amount': '1'}], 'operation': 'CREATE', 'metadata': {'planet': 'earth'}, 'asset': {'data': {'bicycle': {'serial_number': 'abcd1234', 'manufacturer': 'bkfab'}}}, 'version': '2.0', 'id': 'd7fb62d90f1c67861e520cffeb6e7c6a62ed3b7ba335ebfc784c8baba46592a0'}, {'inputs': [{'owners_before': ['AAjpnRqzJRhS8xpQsXNLV1hdaB8gUwgE41qJhinfGtqw'], 'fulfills': {'transaction_id': 'd7fb62d90f1c67861e520cffeb6e7c6a62ed3b7ba335ebfc784c8baba46592a0', 'output_index': 0}, 'fulfillment': 'pGSAIIg31Ki3DZbYOAZMnBmVgV0-hfy_xeDiz9d83I6jBmxagUB3Lj4-f5VhdYkiMLuWDrUhctY-_wQVvOcCdtLy0o7zaMGl-rPmx8k0wK0WXdz-24gkOqqDkJh9fp8uB7RQkNIB'}], 'outputs': [{'public_keys': ['7STQGzddjH2RiiQEedxatVuoi7CqV7NbPPWRxaubaTke'], 'condition': {'details': {'type': 'ed25519-sha-256', 'public_key': '7STQGzddjH2RiiQEedxatVuoi7CqV7NbPPWRxaubaTke'}, 'uri': 'ni:///sha-256;JpyXA6_WsPe-MEyBTchq0XVGsqBR_BnmF1fZI0PD8Qc?fpt=ed25519-sha-256&cost=131072'}, 'amount': '1'}], 'operation': 'TRANSFER', 'metadata': None, 'asset': {'id': 'd7fb62d90f1c67861e520cffeb6e7c6a62ed3b7ba335ebfc784c8baba46592a0'}, 'version': '2.0', 'id': '0ee2929a01e949fe051d1cfaaa643556e6f5caef5d9fb932dae241a9efe98f65'}]

6. To Check tranaction have successfully send or not !
from bigchaindb_driver import BigchainDB
from bigchaindb_driver.crypto import generate_keypair

bdb = BigchainDB(
    'https://test.bigchaindb.com',
    headers={'app_id': 'da9c76b6',b
2523
             'app_key': '34f1acaf209503732a3521afb184560a'})
b = block_height = bdb.blocks.get(txid='d7fb62d90f1c67861e520cffeb6e7c6a62ed3b7ba335ebfc784c8baba46592a0')
print('Block Number')
print(b)
Response -> this will show block number thats hold the transaction details
Block Number
2523


Source: https://docs.bigchaindb.com/projects/py-driver/en/latest/usage.html