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SUBMIT AN ISSUElast edit: Feb 20, 2024

Bittensor API Reference

bt.subtensor

The Subtensor is utilized for managing interactions with the subtensor chain. It serves as an interface to communicate with "Finney", Bittensor's main blockchain network, or others, enabling operations like querying and transacting.

Examples

# Creating a default chain connection to remote finney instance.
sub = bt.subtensor()

# Parsing --subtensor.network and --subtensor.chain_endpoint from the command line
sub = bt.subtensor( config = bt.subtensor.config() )

# Connecting subtensor's default local entrypoint "ws://127.0.0.1:9944"
sub = bt.subtensor( network = 'local' )

# Connecting to a specific endpoint
sub = bt.subtensor( chain_endpoint = "ws://127.0.0.1:9944" )

Methods

nominate

nominate(self, wallet: 'bittensor.Wallet', wait_for_finalization: bool = False, wait_for_inclusion: bool = True) -> bool

Designates the wallet's hotkey as a delegate.

delegate

delegate(self, wallet: 'bittensor.wallet', delegate_ss58: Optional[str] = None, amount: Union[Balance, float] = None, wait_for_inclusion: bool = True, wait_for_finalization: bool = False, prompt: bool = False) -> bool

Adds a specific amount of stake to a delegate using a wallet.

undelegate

undelegate(self, wallet: 'bittensor.wallet', delegate_ss58: Optional[str] = None, amount: Union[Balance, float] = None, wait_for_inclusion: bool = True, wait_for_finalization: bool = False, prompt: bool = False) -> bool

Removes a specific amount of stake from a delegate using a wallet.

set_weights

set_weights(self, wallet: 'bittensor.wallet', netuid: int, uids: Union[torch.LongTensor, list], weights: Union[torch.FloatTensor, list], version_key: int = bittensor.__version_as_int__, wait_for_inclusion:bool = False, wait_for_finalization:bool = False, prompt:bool = False) -> bool

Sets weights for a given netuid.

register

register(self, wallet: 'bittensor.Wallet', netuid: int, wait_for_inclusion: bool = False, wait_for_finalization: bool = True, prompt: bool = False, max_allowed_attempts: int = 3, output_in_place: bool = True, cuda: bool = False, dev_id: Union[List[int], int] = 0, TPB: int = 256, num_processes: Optional[int] = None, update_interval: Optional[int] = None, log_verbose: bool = False) -> bool

Registers the wallet to the chain.

burned_register

burned_register(self, wallet: 'bittensor.Wallet', netuid: int, wait_for_inclusion: bool = False, wait_for_finalization: bool = True, prompt: bool = False) -> bool

Registers the wallet to the chain by recycling TAO.

transfer

transfer(self, wallet: 'bittensor.wallet', dest: str, amount: Union[Balance, float], wait_for_inclusion: bool = True, wait_for_finalization: bool = False, prompt: bool = False) -> bool

Transfers funds from the wallet to a destination public key address.

get_existential_deposit

get_existential_deposit(self, block: Optional[int] = None) -> Optional[Balance]

Returns the existential deposit for the chain.

serve

serve(self, wallet: 'bittensor.wallet', ip: str, port: int, protocol: int, netuid: int, placeholder1: int = 0, placeholder2: int = 0, wait_for_inclusion: bool = False, wait_for_finalization = True, prompt: bool = False) -> bool

Starts serving on a specific IP, port and protocol for a given netuid.

serve_axon

serve_axon(self, netuid: int, axon: 'bittensor.Axon', use_upnpc: bool = False, wait_for_inclusion: bool = False, wait_for_finalization: bool = True, prompt: bool

= False) -> bool

Starts serving an Axon for a given netuid.

serve_prometheus

serve_prometheus(self, wallet: 'bittensor.wallet', port: int, netuid: int, wait_for_inclusion: bool = False, wait_for_finalization: bool = True) -> bool

Starts serving a Prometheus server on a specific port for a given netuid.

add_stake

add_stake(self, wallet: 'bittensor.wallet', hotkey_ss58: Optional[str] = None, amount: Union[Balance, float] = None, wait_for_inclusion: bool = True, wait_for_finalization: bool = False, prompt: bool = False) -> bool

Adds a specific amount of stake to a hotkey uid.

add_stake_multiple

add_stake_multiple(self, wallet: 'bittensor.wallet', hotkey_ss58s: List[str], amounts: List[Union[Balance, float]] = None, wait_for_inclusion: bool = True, wait_for_finalization: bool = False, prompt: bool = False) -> bool

Adds stake to each hotkey in the list from a common coldkey.

unstake

unstake(self, wallet: 'bittensor.wallet', hotkey_ss58: Optional[str] = None, amount: Union[Balance, float] = None, wait_for_inclusion:bool = True, wait_for_finalization:bool = False, prompt: bool = False) -> bool

Removes stake into the wallet coldkey from the specified hotkey uid.

unstake_multiple

unstake_multiple(self, wallet: 'bittensor.wallet', hotkey_ss58s: List[str], amounts: List[Union[Balance, float]] = None, wait_for_inclusion: bool = True, wait_for_finalization: bool = False, prompt: bool = False) -> bool

Removes stake from each hotkey in the list to a common coldkey.

Hyperparameters

rho

rho (self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the network Rho hyperparameter if the network exists. Accepts an integer netuid representing the unique network ID and an optional integer block representing the block number.

kappa

kappa (self, netuid: int, block: Optional[int] = None ) -> Optional[float]

Returns the network Kappa hyperparameter if the network exists. Inputs are netuid and an optional block number.

difficulty

difficulty (self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the network Difficulty hyperparameter if the network exists. Inputs are netuid and an optional block number.

burn

burn (self, netuid: int, block: Optional[int] = None ) -> Optional[bittensor.Balance]

Returns the network Burn hyperparameter if the network exists. Inputs are netuid and an optional block number.

immunity_period

immunity_period (self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the network ImmunityPeriod hyperparameter if the network exists. Inputs are netuid and an optional block number.

validator_batch_size

validator_batch_size (self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the network ValidatorBatchSize hyperparameter if the network exists. Inputs are netuid and an optional block number.

validator_prune_len

validator_prune_len (self, netuid: int, block: Optional[int] = None ) -> int

Returns the network ValidatorPruneLen hyperparameter if the network exists. Inputs are netuid and an optional block number.

validator_logits_divergence

validator_logits_divergence (self, netuid: int, block: Optional[int] = None ) -> Optional[float]

Returns the network ValidatorLogitsDivergence hyperparameter if the network exists. Inputs are netuid and an optional block number.

validator_sequence_length

validator_sequence_length (self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the network ValidatorSequenceLength hyperparameter if the network exists. Inputs are netuid and an optional block number.

validator_epochs_per_reset

validator_epochs_per_reset (self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the network ValidatorEpochsPerReset hyperparameter if the network exists. Inputs are netuid and an optional block number.

validator_epoch_length

validator_epoch_length (self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the network ValidatorEpochLen hyperparameter if the network exists. Inputs are netuid and an optional block number.

validator_exclude_quantile

validator_exclude_quantile (self, netuid: int, block: Optional[int] = None ) -> Optional[float]

Returns the network ValidatorExcludeQuantile hyperparameter if the network exists. Inputs are netuid and an optional block number.

max_allowed_validators

max_allowed_validators(self, netuid: int, block: Optional[int] = None) -> Optional[int]

Returns the network MaxAllowedValidators hyperparameter if the network exists. Inputs are netuid and an optional block number.

min_allowed_weights

min_allowed_weights (self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the network MinAllowedWeights hyperparameter if the network exists. Inputs are netuid and an optional block number.

max_weight_limit

max_weight_limit (self, netuid: int, block: Optional[int] = None ) -> Optional[float]

Returns the network MaxWeightsLimit hyperparameter if the network exists. Inputs are netuid and an optional block number.

scaling_law_power

scaling_law_power (self, netuid: int, block: Optional[int] = None ) -> Optional[float]

Returns the network ScalingLawPower hyperparameter if the network exists. Inputs are netuid and an optional block number.

synergy_scaling_law_power

synergy_scaling_law_power (self, netuid: int, block: Optional[int] = None ) -> Optional[float]

Returns the network SynergyScalingLawPower hyperparameter if the network exists. Inputs are netuid and an optional block number.

subnetwork_n

subnetwork_n (self, netuid: int, block: Optional[int] = None ) -> int

Returns the network SubnetworkN hyperparameter if the network exists. Inputs are netuid and an optional block number.

max_n

max_n (self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the network MaxAllowedUids hyperparameter if the network exists. Inputs are netuid and an optional block number.

blocks_since_epoch

blocks_since_epoch (self, netuid: int, block: Optional[int] = None) -> int

Returns the network BlocksSinceLastStep hyperparameter if the network exists. Inputs are netuid and an optional block number.

tempo

tempo (self, netuid: int, block: Optional[int] = None) -> int

Returns the network Tempo hyperparameter if the network exists. Inputs are netuid and an optional block number.

Account functions

get_total_stake_for_hotkey

get_total_stake_for_hotkey( self, ss58_address: str, block: Optional[int] = None ) -> Optional['bittensor.Balance']

Returns the total stake held on a hotkey including delegated. Inputs are ss58_address and an optional block number.

get_total_stake_for_coldkey

get_total_stake_for_coldkey( self, ss58_address: str, block: Optional[int] = None ) -> Optional['bittensor.Balance']

Returns the total stake held on a coldkey across all hotkeys including delegates. Inputs are ss58_address and an optional block number.

get_stake_for_coldkey_and_hotkey

get_stake_for_coldkey_and_hotkey( self, hotkey_ss58: str, coldkey_ss58: str, block: Optional[int] = None ) -> Optional['bittensor.Balance']

Returns the stake under a coldkey - hotkey pairing. Inputs are hotkey_ss58, coldkey_ss58 and an optional block number.

get_stake

get_stake( self, hotkey_ss58: str, block: Optional[int] = None ) -> List[Tuple[str,'bittensor.Balance']]

Returns a list of stake tuples (coldkey, balance) for each delegating coldkey including the owner. Inputs are hotkey_ss58 and an optional block number.

does_hotkey_exist

does_hotkey_exist( self, hotkey_ss58: str, block: Optional[int] = None ) -> bool

Returns true if the hotkey is known by the chain and there are accounts. Inputs are hotkey_ss58 and an optional block number.

get_hotkey_owner

get_hotkey_owner( self, hotkey_ss58: str, block: Optional[int] = None ) -> Optional[str]

Returns the coldkey owner of the passed hotkey if it exists. Inputs are hotkey_ss58 and an optional block number.

get_axon_info

get_axon_info( self, hotkey_ss58: str, block: Optional[int] = None ) -> Optional[axon_info]

Returns the axon information for the specified hotkey account if it exists. Inputs are hotkey_ss58 and an optional block number.

get_prometheus_info

get_prometheus_info( self, hotkey_ss58: str, block: Optional[int] = None ) -> Optional[axon_info]

Returns the prometheus information for the specified hotkey account if it exists. Inputs are hotkey_ss58 and an optional block number.

Global state

block

@property
def block (self) -> int:

Property that returns the current chain block.

total_issuance

total_issuance (self, block: Optional[int] = None ) -> 'bittensor.Balance'

Returns the total issuance of tokens as of a specified block. If no block is provided, the default is the current block.

total_stake

total_stake (self,block: Optional[int] = None ) -> 'bittensor.Balance'

Returns the total amount of stake as of a specified block. If no block is provided, the default is the current block.

serving_rate_limit

serving_rate_limit (self, block: Optional[int] = None ) -> Optional[int]

Returns the serving rate limit as of a specified block. If no block is provided, the default is the current block.

tx_rate_limit

tx_rate_limit (self, block: Optional[int] = None ) -> Optional[int]

Returns the transaction rate limit as of a specified block. If no block is provided, the default is the current block.

Subnet stake

subnet_exists

subnet_exists( self, netuid: int, block: Optional[int] = None ) -> bool

Checks if a subnet with the given netuid exists as of a specified block. If no block is provided, the default is the current block.

get_all_subnet_netuids

get_all_subnet_netuids( self, block: Optional[int] = None ) -> List[int]

Returns a list of netuids of all subnets as of a specified block. If no block is provided, the default is the current block.

get_total_subnets

get_total_subnets( self, block: Optional[int] = None ) -> int

Returns the total number of subnets as of a specified block. If no block is provided, the default is the current block.

get_subnet_modality

get_subnet_modality( self, netuid: int, block: Optional[int] = None ) -> Optional[int]

Returns the modality of a subnet with a specified netuid as of a given block. If no block is provided, the default is the current block.

get_subnet_connection_requirement

get_subnet_connection_requirement( self, netuid_0: int, netuid_1: int, block: Optional[int] = None) -> Optional[int]

Returns the connection requirement between two subnets with specified netuids as of a given block. If no block is provided, the default is the current block.

get_emission_value_by_subnet

get_emission_value_by_subnet( self, netuid: int, block: Optional[int] = None ) -> Optional[float]

Returns the emission value of a subnet with the given netuid as of a specified block. If no block is provided, the default is the current block.

get_subnet_connection_requirements

get_subnet_connection_requirements( self, netuid: int, block: Optional[int] = None) -> Dict[str, int]

Returns a dictionary of the connection requirements of a subnet with the given netuid as of a specified block. If no block is provided, the default is the current block.

get_subnets

get_subnets( self, block: Optional[int] = None ) -> List[int]

Returns a list of all subnets as of a specified block. If no block is provided, the default is the current block.

get_all_subnets_info

get_all_subnets_info( self, block: Optional[int] = None ) -> List[SubnetInfo]

Returns a list of information about all subnets as of a specified block. If no block is provided, the default is the current block.

get_subnet_info

get_subnet_info( self, netuid: int, block: Optional[int] = None ) -> Optional[SubnetInfo]

Returns information about a subnet with a given netuid as of a specified block. If no block is provided, the default is the current block.

Delegation

is_hotkey_delegate

is_hotkey_delegate( self, hotkey_ss58: str ) -> bool

Checks if a delegate with the specified hotkey exists.

get_delegate_take

get_delegate_take( self, hotkey_ss58: str, block: Optional[int] = None ) -> Optional[float]

Returns the 'take' (portion of the reward a delegate receives from staking) of a delegate specified by a hotkey as of a given block. If no block is provided, the default is the current block.

get_nominators_for_hotkey

get_nominators_for_hotkey( self, hotkey_ss58: str, block: Optional[int] = None ) -> List[Tuple[str, Balance]]

Returns a list of tuples, each containing a nominator's address and balance for the delegate specified by a hotkey as of a given block. If no block is provided, the default is the current block.

get_delegate_by_hotkey

get_delegate_by_hotkey( self, hotkey_ss58: str, block: Optional[int] = None ) -> Optional[DelegateInfo]

Returns information about a delegate specified by a hotkey as of a given block. If no block is provided, the default is the current block.

get_delegates

get_delegates( self, block: Optional[int] = None ) -> List[DelegateInfo]

Returns a list of all delegates as of a specified block. If no block is provided, the default is the current block.

get_delegated

get_delegated( self, coldkey_ss58: str, block: Optional[int] = None ) -> List[Tuple[DelegateInfo, Balance]]

Returns a list of delegates that a given coldkey is staked to, as of a specified block. If no block is provided, the default is the current block. Each item in the list is a tuple containing the delegate's information and the staked balance.

Neuron information per subnet

is_hotkey_registered_any

is_hotkey_registered_any( self, hotkey_ss58: str, block: Optional[int] = None) -> bool

Returns True if the hotkey is registered on any subnet. If no block is specified, the current block is used.

is_hotkey_registered_on_subnet

is_hotkey_registered_on_subnet( self, hotkey_ss58: str, netuid: int, block: Optional[int] = None) -> bool

Returns True if the hotkey is registered on a specified subnet. If no block is specified, the current block is used.

is_hotkey_registered

is_hotkey_registered( self, hotkey_ss58: str, netuid: int, block: Optional[int] = None) -> bool

Returns True if the hotkey is registered on a specified subnet. If no block is specified, the current block is used.

get_uid_for_hotkey_on_subnet

get_uid_for_hotkey_on_subnet( self, hotkey_ss58: str, netuid: int, block: Optional[int] = None) -> int

Returns the user id (uid) for the hotkey on a specified subnet. If no block is specified, the current block is used.

get_all_uids_for_hotkey

get_all_uids_for_hotkey( self, hotkey_ss58: str, block: Optional[int] = None) -> List[int]

Returns a list of all user ids (uids) for the hotkey. If no block is specified, the current block is used.

get_netuids_for_hotkey

get_netuids_for_hotkey( self, hotkey_ss58: str, block: Optional[int] = None) -> List[int]

Returns a list of all network user ids (netuids) for the hotkey. If no block is specified, the current block is used.

get_neuron_for_pubkey_and_subnet

get_neuron_for_pubkey_and_subnet( self, hotkey_ss58: str, netuid: int, block: Optional[int] = None ) -> Optional[NeuronInfo]

Returns the neuron information for the hotkey on a specified subnet. If no block is specified, the current block is used.

get_all_neurons_for_pubkey

get_all_neurons_for_pubkey( self, hotkey_ss58: str, block: Optional[int] = None ) -> List[NeuronInfo]

Returns a list of all neurons for the hotkey. If no block is specified, the current block is used.

neuron_has_validator_permit

neuron_has_validator_permit( self, uid: int, netuid: int, block: Optional[int] = None ) -> Optional[bool]

Returns True if the neuron with the given uid has a validator permit for the specified subnet. If no block is specified, the current block is used.

neuron_for_wallet

neuron_for_wallet( self, wallet: 'bittensor.Wallet', netuid = int, block: Optional[int] = None ) -> Optional[NeuronInfo]

Returns the neuron information for the given wallet on a specified subnet. If no block is specified, the current block is used.

neuron_for_uid

neuron_for_uid( self, uid: int, netuid: int, block: Optional[int] = None ) -> Optional[NeuronInfo]

Returns the neuron metadata associated with a given user id (uid) and network user id (netuid) at a specified block, or None if it does not exist.

neurons

neurons(self, netuid: int, block: Optional[int] = None ) -> List[NeuronInfo]

Returns a list of neurons from the chain for a given network user id (netuid) at a specified block.

neuron_for_uid_lite

neuron_for_uid_lite( self, uid: int, netuid: int, block: Optional[int] = None ) -> Optional[NeuronInfoLite]

Returns the lightweight neuron metadata (without weights and bonds) associated with a given user id (uid) and network user id (netuid) at a specified block, or None if it does not exist.

neurons_lite

neurons_lite(self, netuid: int, block: Optional[int] = None ) -> List[NeuronInfoLite]

Returns a list of lightweight neurons (without weights and bonds) from the chain for a given network user id (netuid) at a specified block.

metagraph

metagraph( self, netuid: int, lite: bool = True ) -> 'bittensor.Metagraph'

Returns the metagraph for the subnet associated with a given network user id (netuid). If 'lite' is True, it returns a metagraph using the lightweight sync (no weights, no bonds).

Legacy

get_balance

get_balance(self, address: str, block: int = None) -> Balance

Returns the token balance for the given Substrate address at a specified block.

get_current_block

get_current_block(self) -> int

Returns the current block number on the chain.

get_balances

get_balances(self, block: int = None) -> Dict[str, Balance]

Returns a dictionary of balances for all addresses at a specified block. The dictionary keys are addresses and values are their corresponding balances.

__str__()

This method is used to provide a string representation of the instance.

str(obj)

If the network argument equals the chain_endpoint argument, it returns a string that denotes connecting to a chain endpoint without a known network. Otherwise, it represents connecting to a network with a known endpoint.

__repr__()

This method is used to provide an official string representation of the instance.

repr(obj)

The string returned by this method is identical to the one provided by the __str__() method.

Initialization

To initialize an instance of the Subtensor class, you'll need to provide three arguments:

import bittensor as bt
obj = bt.subtensor( config, network, chain_endpoint )

Arguments

  • config (bt.Config, optional, defaults=bt.subtensor.config()): Subtensor config object containing arguments from bt.subtensor.config() which are automatically parsed from command line and ENV vars.
  • network (str, optional, default='finney'): The subtensor network flag. The likely choices are: -- local (local running network) -- finney (main network) -- mock (mock network for testing.) If this option is set it overloads subtensor.chain_endpoint with an entry point node from that network.
  • chain_endpoint (str, default=None): The subtensor endpoint flag. If set, overrides the network argument.

Bt.metagraph

Chain state Torch interface

The Metagraph class holds the chain state of a particular subnetwork at a specific block.

Examples

import bittensor as bt

# Creating metagraph and sync state from a netuid parameter, defaults to connecting to network `finney`
metagraph = bt.metagraph( netuid = 1 )

# Create metagraph and sync with lite = False to sync weights and bonds matrices.
metagraph = bt.metagraph( netuid = 1, lite = False)

# Create metagraph and sync state from local entrypoint, assuming a subtensor chain is currently running.
metagraph = bt.metagraph( netuid = 1, network = 'local' )

# Create an empty metagraph object with no state syncing.
metagraph = bt.metagraph( netuid = 1, sync = False )

# Sync the metagraph at a particular block
metagraph.sync( block = 100000 )

# Save the metagraph to ~/.bittensor/metagraphs/network-$NETWORK_NAME/netuid-#NETUID/block-$BLOCK.pt
metagraph.save()

# Load the latest metagraph by block.
metagraph.load()

Methods

S

def S(self) -> torch.FloatTensor

Returns the total stake.

R

def R(self) -> torch.FloatTensor

Returns the ranks.

I

def I(self) -> torch.FloatTensor

Returns the incentive.

E

def E(self) -> torch.FloatTensor

Returns the emission.

C

def C(self) -> torch.FloatTensor

Returns the consensus.

T

def T(self) -> torch.FloatTensor

Returns the trust.

Tv

def Tv(self) -> torch.FloatTensor

Returns the validator trust.

D

def D(self) -> torch.FloatTensor

Returns the dividends.

B

def B(self) -> torch.FloatTensor

Returns the bonds.

W

def W(self) -> torch.FloatTensor

Returns the weights.

hotkeys

def hotkeys(self) -> List[str]

Returns the list of hotkeys for the axons.

coldkeys

def coldkeys(self) -> List[str]

Returns the list of coldkeys for the axons.

addresses

def addresses(self) -> List[str]

Returns the list of IP addresses for the axons.

str

def __str__(self)

Returns a string representation of the Metagraph.

repr

def __repr__(self)

Returns the same string representation as __str__.

metadata

def metadata(self) -> dict

Returns a dictionary of Metagraph metadata.

init

def __init__(self, netuid: int, network: str = 'finney', lite: bool = True, sync: bool = True) -> 'metagraph'

Initializes a new instance of the Metagraph.

sync

def sync (self, block: Optional[int] = None, lite: bool = True) -> 'metagraph'

Syncs the Metagraph state at the passed block. Optionally syncs the weights also.

save

def save(self) -> 'metagraph'

Saves the Metagraph object's state_dict under bittensor root directory.

load

def load(self) -> 'metagraph'

Loads the Metagraph object's state_dict from bittensor root directory.

load_from_path

def load_from_path(self, dir_path:str) -> 'metagraph'

Loads the Metagraph object's state_dict from the specified directory path.

Bt.logging

The Logging interfaces with bittensor internal logging system.

Examples

import bittensor as bt

# Turn on debug logs
bt.debug()

# Turn on trace logs
bt.trace()

# Turn off debug logs
bt.set_debug(False)

# Turn off trace logs
bt.set_trace(False)

# Turn on logging from class definition
bt.logging( set_debug = True )

# Instantiate logging from command line args
bt.logging( bt.logging.config() )

# Turn on logging to file
bt.logging( record_log = True, logging_dir = '/path/to/logs/' )

# Log
bt.logging.info(message)
bt.logging.debug(message)
bt.logging.trace(message)
bt.logging.success(message)
bt.logging.critical(message)
bt.logging.error(message)
>>> 2023-05-29 09:27:25.426 | INFO | message

# Log using prefex suffix design
bt.logging.info(prefix, message)
bt.logging.debug(prefix, message)
bt.logging.trace(prefix, message)
bt.logging.success(prefix, message)
bt.logging.critical(prefix, message)
bt.logging.error(prefix, message)
>>> 2023-05-29 09:27:47.184 | INFO | cat dogs