Project API

The project package contains methods for initializing, loading and compiling Brownie projects, and container classes to hold the data.

When Brownie is loaded from within a project folder, that project is automatically loaded and the ContractContainer objects are added to the __main__ namespace. Unless you are working with more than one project at the same time, there is likely no need to directly interact with the top-level Project object or any of the methods within this package.

Only the project.main module contains methods that directly interact with the filesystem.


The main module contains the high-level methods and classes used to create, load, and close projects. All of these methods are available directly from brownie.project.


class brownie.project.main.Project

Top level container that holds all objects related to a Brownie project.

Project Methods

classmethod Project.load()

Collects project source files, compiles new or updated contracts, instantiates ContractContainer objects, and populates the namespace.

Projects are typically loaded via project.load, but if you have a Project object that was previously closed you can reload it using this method.

classmethod Project.load_config()

Updates the configuration settings from the brownie-config.yaml file within this project’s root folder.

classmethod Project.close(raises = True)

Removes this object and the related ContractContainer objects from the namespace.

>>> from brownie.project import TokenProject
>>> TokenProject.close()
>>> TokenProject
NameError: name 'TokenProject' is not defined
classmethod Project.dict()

Returns a dictionary of ContractContainer objects.

>>> from brownie.project import TokenProject
>>> TokenProject.dict()
   'Token': [],
   'SafeMath': []


class brownie.project.main.TempProject

Simplified version of Project, used to hold contracts that are compiled via project.compile_source. Instances of this class are not included in the list of active projects or automatically placed anywhere within the namespace.

Module Methods


Checks for an existing Brownie project within a folder and it’s parent folders, and returns the base path to the project as a Path object. Returns None if no project is found.

Accepts a path as a str or a Path object.

>>> from brownie import project
>>> Path('.').resolve()
>>> project.check_for_project('.')

Returns a list of currently loaded Project objects.

>>> from brownie import project
>>> project.get_loaded_projects()
[<Project object 'TokenProject'>, <Project object 'OtherProject'>]".", ignore_subfolder=False)

Initializes a new project at the given path. If the folder does not exist, it will be created.

Returns the path to the project as a string.

>>> from brownie import project
main.from_brownie_mix(project_name, project_path=None, ignore_subfolder=False)

Initializes a new project via a template. Templates are downloaded from the Brownie Mix github repo.

If no path is given, the project will be initialized in a subfolder of the same name.

Returns the path to the project as a string.

>>> from brownie import project
>>> project.from_brownie_mix('token')
Downloading from

Generates a TempProject from an ethPM package.

  • uri: ethPM manifest URI. Format can be ERC1319 or IPFS.
main.load(project_path=None, name=None)

Loads a Brownie project and instantiates various related objects.

  • project_path: Path to the project. If None, attempts to find one using check_for_project('.').
  • name: Name to assign to the project. If None, the name is generated from the name of the project folder.

Returns a Project object. The same object is also available from within the project module namespce.

>>> from brownie import project
>>> project.load('/my_projects/token')
[<Project object 'TokenProject'>]
>>> project.TokenProject
<Project object 'TokenProject'>
>>> project.TokenProject.Token
<ContractContainer object 'Token'>
main.compile_source(source, solc_version=None, optimize=True, runs=200, evm_version=None)

Compiles the given source code string and returns a TempProject object.

If Vyper source code is given, the contract name will be Vyper.

>>> from brownie import compile_source
>>> container = compile_source('''pragma solidity 0.4.25;

contract SimpleTest {

  string public name;

  constructor (string _name) public {
    name = _name;
>>> container
<TempProject object>
>>> container.SimpleTest
<ContractContainer object 'SimpleTest'>

Install a package.

See the Brownie Package Manager documentation for more information on packages.

  • package_id: Package identifier or ethPM URI

The build module contains classes and methods used internally by Brownie to interact with files in a project’s build/contracts folder.



Container that stores and manipulates build data loaded from the build/contracts/ files of a specific project. It is instantiated automatically when a project is opened, and available within the Project object as Project._build.

>>> from brownie.project import TokenProject
>>> TokenProject._build
< object at 0x7fb74cb1b2b0>

Build Methods

classmethod Build.get(contract_name)

Returns build data for the given contract name.

>>> from brownie.project import build
>>> build.get('Token')
classmethod Build.items(path=None)

Provides an list of tuples in the format ('contract_name', build_json), similar to calling dict.items. If a path is given, only contracts derived from that source file are returned.

>>> from brownie.project import build
>>> for name, data in build.items():
...     print(name)
classmethod Build.contains(contract_name)

Checks if a contract with the given name is in the currently loaded build data.

>>> from brownie.project import build
>>> build.contains('Token')
classmethod Build.get_dependents(contract_name)

Returns a list of contracts that inherit or link to the given contract name. Used by the compiler when determining which contracts to recompile based on a changed source file.

>>> from brownie.project import build
>>> build.get_dependents('Token')

Build Internal Methods

classmethod Build._add(build_json)

Adds a contract’s build data to the container.

classmethod Build._remove(contract_name)

Removes a contract’s build data from the container.

classmethod Build._generate_revert_map(pcMap)

Adds a contract’s dev revert strings to the revert map and it’s pcMap. Called internally when adding a new contract.

The revert map is dict of tuples, where each key is a program counter that contains a REVERT or INVALID operation for a contract in the active project. When a transaction reverts, the dev revert string can be determined by looking up the final program counter in this mapping.

Each value is a 5 item tuple of: ("path/to/source", (start, stop), "function name", "dev: revert string", self._source)

When two contracts have differing values for the same program counter, the value in the revert map is set to False. If a transaction reverts with this pc, the entire trace must be queried to determine which contract reverted and get the dev string from it’s pcMap.

Internal Methods

The following methods exist outside the scope of individually loaded projects.


Given the program counter from a stack trace that caused a transaction to revert, returns the commented dev string (if any). Used by TransactionReceipt.

>>> from brownie.project import build
>>> build.get_dev_revert(1847)
"dev: zero value"

Given the program counter from a stack trace that caused a transaction to revert, returns the highlighted relevent source code and the name of the method that reverted.

Used by TransactionReceipt when generating a VirtualMachineError.


The compiler module contains methods for compiling contracts, and formatting the compiled data. This module is used internally whenever a Brownie project is loaded.

In most cases you will not need to call methods in this module directly. Instead you should use project.load to compile your project initially and project.compile_source for adding individual, temporary contracts. Along with compiling, these methods also add the returned data to Project._build and return ContractContainer objects.

Module Methods


Sets the solc version. If the requested version is not available it will be installed.

>>> from brownie.project import compiler
>>> compiler.set_solc_version("0.4.25")
Using solc version v0.4.25

Installs one or more versions of solc.

>>> from brownie.project import compiler
>>> compiler.install_solc("0.4.25", "0.5.10")
compiler.compile_and_format(contract_sources, solc_version=None, optimize=True, runs=200, evm_version=None, silent=True, allow_paths=None)

Given a dict in the format {'path': "source code"}, compiles the contracts and returns the formatted build data.

  • contract_sources: dict in the format {'path': "source code"}
  • solc_version: solc version to compile with. If None, each contract is compiled with the latest installed version that matches the pragma.
  • optimize: Toggle compiler optimization
  • runs: Number of compiler optimization runs
  • evm_version: EVM version to target. If None the compiler default is used.
  • silent: Toggle console verbosity
  • allow_paths: Import path, passed to solc as an additional path that contract files may be imported from

Calling this method is roughly equivalent to the following:

>>> from brownie.project import compiler

>>> input_json = compiler.generate_input_json(contract_sources)
>>> output_json = compiler.compile_from_input_json(input_json)
>>> build_json = compiler.generate_build_json(input_json, output_json)
compiler.find_solc_versions(contract_sources, install_needed=False, install_latest=False, silent=True)

Analyzes contract pragmas and determines which solc version(s) to use.

  • contract_sources: dict in the format {'path': "source code"}
  • install_needed: if True, solc is installed when no installed version matches a contract pragma
  • install_latest: if True, solc is installed when a newer version is available than the installed one
  • silent: enables verbose reporting

Returns a dict of {'version': ["path", "path", ..]}.

compiler.find_best_solc_version(contract_sources, install_needed=False, install_latest=False, silent=True)

Analyzes contract pragmas and finds the best version compatible with all sources.

  • contract_sources: dict in the format {'path': "source code"}
  • install_needed: if True, solc is installed when no installed version matches a contract pragma
  • install_latest: if True, solc is installed when a newer version is available than the installed one
  • silent: enables verbose reporting

Returns a dict of {'version': ["path", "path", ..]}.

compiler.generate_input_json(contract_sources, optimize=True, runs=200, evm_version=None, language="Solidity")

Generates a standard solc input JSON as a dict.

compiler.compile_from_input_json(input_json, silent=True, allow_paths=None)

Compiles from an input JSON and returns a standard solc output JSON as a dict.

compiler.generate_build_json(input_json, output_json, compiler_data={}, silent=True)

Formats input and output compiler JSONs and returns a Brownie build JSON dict.

  • input_json: Compiler input JSON dict
  • output_json: Computer output JSON dict
  • compiler_data: Additional compiler data to include
  • silent: Toggles console verbosity


The ethpm module contains methods for interacting with ethPM manifests and registries. See the The Ethereum Package Manager for more detailed information on how to access this functionality.

Module Methods


Fetches an ethPM manifest and processes it for use with Brownie. A local copy is also stored if the given URI follows the ERC1319 spec.

  • uri: URI location of the manifest. Can be IPFS or ERC1319.
ethpm.process_manifest(manifest, uri)

Processes a manifest for use with Brownie.

  • manifest: ethPM manifest
  • uri: IPFS uri of the package
ethpm.get_deployment_addresses(manifest, contract_name, genesis_hash)

Parses a manifest and returns a list of deployment addresses for the given contract and chain.

  • manifest: ethPM manifest
  • contract_name: Name of the contract
  • genesis_block: Genesis block hash for the chain to return deployments on. If None, the currently active chain will be used.

Returns information on installed ethPM packages within a project.

  • project_path: Path to the root folder of the project


  • [(project name, version), ..] of installed packages
  • [(project name, version), ..] of installed-but-modified packages
ethpm.install_package(project_path, uri, replace_existing)

Installs an ethPM package within the project.

  • project_path: Path to the root folder of the project
  • uri: manifest URI, can be ethpm, erc1319 or ipfs
  • replace_existing: if True, existing files will be overwritten when installing the package

Returns the package name as a string.

ethpm.remove_package(project_path, package_name, delete_files)

Removes an ethPM package from a project.

  • project_path: Path to the root folder of the project
  • package_name: name of the package
  • delete_files: if True, source files related to the package are deleted. Files that are still required by other installed packages will not be deleted.

Returns a boolean indicating if the package was installed.

ethpm.create_manifest(project_path, package_config, pin_assets=False, silent=True)

Creates a manifest from a project, and optionally pins it to IPFS.

  • project_path: Path to the root folder of the project
  • package_config: Configuration settings for the manifest
  • pin_assets: if True, all source files and the manifest will be uploaded onto IPFS via Infura.

Returns: (generated manifest, ipfs uri of manifest)

ethpm.verify_manifest(package_name, version, uri)

Verifies the validity of a package at a given IPFS URI.

  • package_name: Package name
  • version: Package version
  • uri: IPFS uri

Raises InvalidManifest if the manifest is not valid.

ethpm.release_package(registry_address, account, package_name, version, uri)

Creates a new release of a package at an ERC1319 registry.

  • registry_address: Address of the registry
  • account: Account object used to broadcast the transaction to the registry
  • package_name: Name of the package
  • version: Package version
  • uri: IPFS uri of the package

Returns the TransactionReceipt of the registry call to release the package.


The scripts module contains methods for comparing, importing and executing python scripts related to a project., method_name="main", args=None, kwargs=None, project=None)

Imports a project script, runs a method in it and returns the result.

script_path: path of script to import method_name: name of method in the script to run args: method args kwargs: method kwargs project: Project object that should available for import into the script namespace

>>> from brownie import run
>>> run('token')

Running 'scripts.token.main'...

Transaction sent: 0xeb9dfb6d97e8647f824a3031bc22a3e523d03e2b94674c0a8ee9b3ff601f967b
Token.constructor confirmed - block: 1   gas used: 627391 (100.00%)
Token deployed at: 0x8dc446C44C821F27B333C1357990821E07189E35

Internal Methods


Returns a hash based on the AST of a script and any scripts that it imports. Used to determine if a project script has been altered since it was last run.

path: path of the script

>>> from brownie.project.scripts import get_ast_hash
>>> get_ast_hash('scripts/')


The sources module contains classes and methods to access project source code files and information about them.


class brownie.project.sources.Sources

The Sources object provides access to the contracts/ and interfaces/ files for a specific project. It is instantiated automatically when a project is loaded, and available within the Project object as Project._sources.

>>> from brownie.project import TokenProject
>>> TokenProject._sources
<brownie.project.sources.Sources object at 0x7fb74cb1bb70>
classmethod Sources.get(name)

Returns the source code file for the given name. name can be a path or a contract name.

>>> from brownie.project import sources
>>> sources.get('SafeMath')
"pragma solidity ^0.5.0; ..."
classmethod Sources.get_path_list()

Returns a sorted list of contract source paths for the project.

>>> from brownie.project import sources
>>> sources.get_path_list()
['contracts/SafeMath.sol', 'contracts/Token.sol', 'interfaces/IToken.sol']
classmethod Sources.get_contract_list()

Returns a sorted list of contract names for the project.

>>> from brownie.project import sources
>>> sources.get_contract_list()
['SafeMath', 'Token']
classmethod Sources.get_interface_list()

Returns a sorted list of interface names for the project.

>>> from brownie.project import sources
>>> sources.get_interface_list()
classmethod Sources.get_interface_hashes()

Returns a dict of interface hashes in the form of {'interfaceName': "hash"}

classmethod Sources.get_interface_sources()

Returns a dict of interfaces sources in the form {'path/to/interface': "source code"}

classmethod Sources.get_source_path(contract_name)

Returns the path to the file where a contract or interface is located.

>>> from brownie.project import sources
>>> sources.get_source_path('Token')

Module Methods

sources.is_inside_offset(inner, outer)

Returns a boolean indicating if the first offset is contained completely within the second offset.

>>> from brownie.project import sources
>>> sources.is_inside_offset([100, 200], [100, 250])

Given a Solidity contract source as a string, returns a dict of source code for individual contracts.

>>> from brownie.project.sources import get_contracts
>>> get_contracts('''
... pragma solidity 0.5.0;
... contract Foo {
...     function bar() external returns (bool) {
...         return true;
...     }
... }
... library Bar {
...     function baz(uint a, uint b) external pure returns (uint) {
...         return a + b;
...     }
... }''')
    'Foo': 'contract Foo {\n    function bar() external returns (bool) {\n        return true;\n    }\n}',
    'Bar': 'library Bar {\n    function baz(uint a, uint b) external pure returns (uint) {\n        return a + b;\n    }\n}'
sources.get_pragma_spec(source, path=None)

Returns an NpmSpec object representing the first pragma statement found within a source file.

Raises PragmaError on failure. If path is not None, it will be included in the error string.