substrateinterface_example.py

# Install package with: pip install git+https://github.com/polkascan/py-substrate-interface.git@master#egg=substrateinterface

from scalecodec.base import RuntimeConfiguration
from scalecodec.type_registry import load_type_registry_preset

from substrateinterface import SubstrateInterface
from substrateinterface.utils.ss58 import ss58_encode

RuntimeConfiguration().update_type_registry(load_type_registry_preset("default"))
RuntimeConfiguration().update_type_registry(load_type_registry_preset("kusama"))

substrate = SubstrateInterface(url="http://127.0.0.1:9933/")

# Set block_hash to None for chaintip
block_hash = "0x588930468212316d8a75ede0bec0bc949451c164e2cea07ccfc425f497b077b7"

metadata = substrate.get_block_metadata(block_hash=block_hash)

result = substrate.get_chain_block(
    block_hash=block_hash,
    metadata_decoder=metadata
)

for extrinsic in result['block']['extrinsics']:

    if 'account_id' in extrinsic:
        signed_by_address = ss58_encode(address=extrinsic['account_id'], address_type=2)
    else:
        signed_by_address = None

    print('\nModule: {}\nCall: {}\nSigned by: {}'.format(
        extrinsic['call_module'],
        extrinsic['call_function'],
        signed_by_address
    ))

    for param in extrinsic['params']:

        if param['type'] == 'Address':
            param['value'] = ss58_encode(address=param['value'].replace('0x', ''), address_type=2)

        print("Param '{}': {}".format(param['name'], param['value']))