Building and parsing operations

Operation group

class pytezos.operation.group.OperationGroup(context: pytezos.context.impl.ExecutionContext, contents: Optional[List[Dict[str, Any]]] = None, protocol: Optional[str] = None, chain_id: Optional[int] = None, branch: Optional[str] = None, signature: Optional[str] = None)

Operation group representation: contents (single or multiple), signature, other fields, and also useful helpers for filling with precise fees, signing, forging, and injecting.

activate_account(activation_code='', pkh='')

Activate recommended allocations for contributions to the TF fundraiser. More info https://activate.tezos.com/

Parameters

• activation_code – Secret code from pdf, leave empty for autocomplete

• pkh – Public key hash, leave empty for autocomplete

Returns

dict or OperationGroup

autofill(gas_reserve: int = 100, counter: Optional[int] = None, branch_offset: int = 50, fee: Optional[int] = None, gas_limit: Optional[int] = None, storage_limit: Optional[int] = None) → pytezos.operation.group.OperationGroup

Fill the gaps and then simulate the operation in order to calculate fee, gas/storage limits.

Parameters

• gas_reserve – Add a safe reserve for dynamically calculated gas limit (default is 100).

• counter – Override counter value (for manual handling)

• branch_offset – Select head~offset block as branch, where offset is in range (0, 60)

• fee – Explicitly set fee for operation. If not set fee will be calculated depeding on results of operation dry-run.

• gas_limit – Explicitly set gas limit for operation. If not set gas limit will be calculated depeding on results of operation dry-run.

• storage_limit – Explicitly set storage limit for operation. If not set storage limit will be calculated depeding on results of operation dry-run.

Return type

OperationGroup

ballot(proposal, ballot, source='', period=0)

Vote for a proposal in a given voting period. Can only be submitted during Testing_vote or Promotion_vote periods, and only once per period. More info https://tezos.gitlab.io/master/whitedoc/voting.html

Parameters

• proposal – Hash of the proposal

• ballot – ‘Yay’, ‘Nay’ or ‘Pass’

• source – Public key hash (of the signatory), leave None for autocomplete

• period – Number of the current voting period, leave None for autocomplete

Returns

dict or OperationGroup

binary_payload() → bytes

Get binary payload used for injection/hash calculation.

delegation(delegate='', source='', counter=0, fee=0, gas_limit=0, storage_limit=0)

Delegate funds or register yourself as a delegate.

Parameters

• delegate – tz address of delegate, leave None to register yourself as a delegate

• source – Address from which funds will be delegated, leave None to use signatory address

• counter – Current account counter, leave None for autocomplete

• fee – Leave None for autocomplete

• gas_limit – Leave None for autocomplete

• storage_limit – Leave None for autocomplete

Returns

dict or OperationGroup

double_baking_evidence(bh1, bh2)

Provide evidence of double baking (two different blocks at the same height).

Parameters

• bh1 – First block hash

• bh2 – Second block hash

Returns

dict or OperationGroup

double_endorsement_evidence(op1: dict, op2: dict)

Provide evidence of double endorsement (endorsing two different blocks at the same block height).

Parameters

• op1 –

  Inline endorsement {

  ”branch”: $block_hash, “operations”: {

  ”kind”: “endorsement”, “level”: integer ∈ [-2^31-2, 2^31+2]

  }, “signature”?: $Signature

  }

• op2 – Inline endorsement

Returns

dict or OperationGroup

endorsement(level: int)

Endorse a block.

Parameters

level – Endorsed level

Returns

dict or OperationGroup

fill(counter=None, branch_offset=50)

Try to fill all fields left unfilled, use approximate fees (not optimal, use autofill to simulate operation and get precise values).

Parameters

• counter – Override counter value (for manual handling)

• branch_offset – select head~offset block as branch, where offset is in range (0, 60)

Return type

OperationGroup

forge(validate=True)

Convert json representation of the operation group into bytes.

Parameters

validate – Forge remotely also and compare results, default is True

Returns

Hex string

hash() → str

Calculate the Base58 encoded operation group hash.

inject(_async=True, preapply=True, check_result=True, num_blocks_wait=5, time_between_blocks: Optional[int] = None)

Inject the signed operation group.

Parameters

• _async – do not wait for operation inclusion (default is True)

• preapply – do a preapply before injection

• check_result – raise RpcError in case operation is applied but has runtime errors

• num_blocks_wait – number of blocks to wait for injection

• time_between_blocks – override the corresponding parameter from constants

Returns

operation group with metadata (raw RPC response)

json_payload() → dict

Get json payload used for the preapply.

operation(content)

Create new operation group with extra content added.

Parameters

content – Kind-specific operation body

Return type

OperationGroup

origination(script, balance=0, delegate=None, source='', counter=0, fee=0, gas_limit=0, storage_limit=0)

Deploy smart contract (scriptless KT accounts are not used for delegation since Babylon)

Parameters

• script – {“code”: $Micheline, “storage”: $Micheline}

• balance – Amount transferred on the balance, WARNING: there is no default way to withdraw funds. More info: https://tezos.stackexchange.com/questions/1315/can-i-withdraw-funds-from-an-empty-smart-contract

• delegate – Set contract delegate, default None

• source – Address from which funds will be sent, leave None to use signatory address

• counter – Current account counter, leave None for autocomplete

• fee – Leave None for autocomplete

• gas_limit – Leave None for autocomplete

• storage_limit – Leave None for autocomplete

Returns

dict or OperationGroup

preapply()

Preapply signed operation group.

Returns

RPC response from preapply

proposals(proposals, source='', period=0)

Submit and/or upvote proposals to amend the protocol. Can only be submitted during a proposal period. More info https://tezos.gitlab.io/master/whitedoc/voting.html

Parameters

• proposals – List of proposal hashes or single proposal hash

• source – Public key hash (of the signatory), leave None for autocomplete

• period – Number of the current voting period, leave 0 for autocomplete

Returns

dict or OperationGroup

result() → List[pytezos.operation.result.OperationResult]

Parse the preapply result.

Return type

List[OperationResult]

reveal(public_key='', source='', counter=0, fee=0, gas_limit=0, storage_limit=0)

Reveal the public key associated with a tz address.

Parameters

• public_key – Public key to reveal, Base58 encoded

• source – Public key hash of the key revealed, leave None to use signatory address

• counter – Current account counter, leave None for autocomplete (More info https://tezos.stackexchange.com/questions/632/how-counter-grows)

• fee – Leave None for autocomplete

• gas_limit – Leave None for autocomplete

• storage_limit – Leave None for autocomplete

Returns

dict or OperationGroup

run(block_id='head')

Simulate operation without signature checks.

Parameters

block_id – Specify a level at which this operation should be applied (default is head)

Returns

RPC response from run_operation

seed_nonce_revelation(level: int, nonce)

Reveal the nonce committed operation in the previous cycle. More info https://tezos.stackexchange.com/questions/567/what-are-nonce-revelations

Parameters

• level – When nonce hash was committed

• nonce – Hex string

Returns

dict or OperationGroup

sign()

Sign the operation group with the key specified by using.

Return type

OperationGroup

transaction(destination, amount=0, parameters=None, source='', counter=0, fee=0, gas_limit=0, storage_limit=0)

Transfer tez to a given address (implicit or originated). If the receiver is a smart contract, then optional parameters may be passed.

Parameters

• source – Address from which funds will be sent, leave None to use signatory address

• destination – Address

• amount – Amount to send in microtez (int) or tez (Decimal) (optional)

• counter – Current account counter, leave None for autocomplete

• parameters – { “entrypoint”: $string, “value”: $Micheline expression } (optional)

• fee – Leave None for autocomplete

• gas_limit – Leave None for autocomplete

• storage_limit – Leave None for autocomplete

Returns

dict or OperationGroup

Operation result

class pytezos.operation.result.OperationResult(**props)

Operation result representation + useful parsing helpers for operation group

static burned(operation_group) → int

Get total burned (due to account allocations) for an operation group (recursively).

Parameters

operation_group – {“branch”: “B…”, “contents”: […], …} OR a single content {“kind”: “transaction”, …}

static consumed_gas(operation_group) → int

Get total consumed gas for an operation group (recursively).

Parameters

operation_group – {“branch”: “B…”, “contents”: […], …} OR a single content {“kind”: “transaction”, …}

static errors(operation_group: dict) → list

Collect errors from all operation results in a group.

Parameters

operation_group – {“branch”: “B…”, “contents”: […], …} OR a single content {“kind”: “transaction”, …}

Returns

list of errors [{“id”: “”, …}]

classmethod from_operation_group(operation_group: dict, **predicates) → List[pytezos.operation.result.OperationResult]

Initialize with operation group contents.

Parameters

operation_group – operation_group: {“branch”: “B…”, “contents”: […], …} :param predicates: filter contents using predicates field=value

Return type

List[OperationResult]

classmethod from_origination(content: dict)

Initialize with origination content.

Parameters

content –

Return type

OperationResult

classmethod from_transaction(content: dict)

Initialize with transaction content.

Parameters

content –

Return type

OperationResult

static get_contents(operation_group: dict, **predicates)

static get_result(content)

static is_applied(operation_group) → bool

Check if ALL operations in a group are applied.

Parameters

operation_group – {“branch”: “B…”, “contents”: […], …} OR a single content {“kind”: “transaction”, …}

static iter_contents(operation_group: dict)

Lazily iterate operation group contents including internal operations.

Parameters

operation_group – {“branch”: “B…”, “contents”: […], …} OR a single content {“kind”: “transaction”, …}

Returns

generator

static iter_results(operation_group: dict)

Lazily iterate operation results including internal operation results.

Parameters

operation_group – {“branch”: “B…”, “contents”: […], …} OR a single content {“kind”: “transaction”, …}

Returns

generator

static originated_contracts(operation_group: dict) → list

Collect originated contract addresses from all operation results in a group.

Parameters

operation_group – {“branch”: “B…”, “contents”: […], …} OR a single content {“kind”: “transaction”, …}

Returns

list of addresses [“tz12345…”, …]

static paid_storage_size_diff(operation_group) → int

Get total paid storage size diff for an operation group (recursively).

Parameters

operation_group – {“branch”: “B…”, “contents”: […], …} OR a single content {“kind”: “transaction”, …}

Fees and limits

pytezos.operation.fees.calculate_fee(content: dict, consumed_gas: int, extra_size: int, reserve=10) → int

Calculate minimal required operation fee.

Parameters

• content – operation content {…, “kind”: “transaction”, … }

• consumed_gas – amount of gas consumed during the simulation (dry-run)

• extra_size – size of the additional operation data (branch, etc)

• reserve – safe reserve, just in case

pytezos.operation.fees.default_fee(content) → int

Take hard gas limit instead of precise amount (no simulation) and calculate fee.

Parameters

content – operation content {…, “kind”: “transaction”, … }

pytezos.operation.fees.default_gas_limit(content) → int

Get default gas limit by operation kind.

Parameters

content – operation content {…, “kind”: “transaction”, … }

pytezos.operation.fees.default_storage_limit(content)

Get default storage limit by operation kind.

Parameters

content – operation content {…, “kind”: “transaction”, … }

Local forge

pytezos.operation.forge.forge_activate_account(content: dict)

pytezos.operation.forge.forge_delegation(content)

pytezos.operation.forge.forge_entrypoint(entrypoint) → bytes

Encode Michelson contract entrypoint into the byte form.

Parameters

entrypoint – string

pytezos.operation.forge.forge_operation(content) → bytes

Forge operation content (locally).

Parameters

content – {.., “kind”: “transaction”, …}

pytezos.operation.forge.forge_operation_group(operation_group)

Forge operation group (locally).

Parameters

operation_group – {“branch”: “B…”, “contents”: [], …}

pytezos.operation.forge.forge_origination(content)

pytezos.operation.forge.forge_reveal(content)

pytezos.operation.forge.forge_transaction(content)

pytezos.operation.forge.has_parameters(content)