Utilities
Toolkit wrappers
The toolkit wrappers provide a simple uniform API for accessing minimal functionality of cheminformatics toolkits.
These toolkit wrappers are generally used through a ToolkitRegistry
, which can be constructed with a desired precedence of toolkits:
>>> from openff.toolkit.utils.toolkits import ToolkitRegistry, OpenEyeToolkitWrapper, RDKitToolkitWrapper, AmberToolsToolkitWrapper
>>> toolkit_registry = ToolkitRegistry()
>>> toolkit_precedence = [OpenEyeToolkitWrapper, RDKitToolkitWrapper, AmberToolsToolkitWrapper]
>>> [ toolkit_registry.register_toolkit(toolkit) for toolkit in toolkit_precedence if toolkit.is_available() ]
[None, None, None]
The toolkit wrappers can then be accessed through the registry:
>>> from openff.toolkit.utils.toolkits import GLOBAL_TOOLKIT_REGISTRY as toolkit_registry
>>> from openff.toolkit import Molecule
>>> molecule = Molecule.from_smiles('Cc1ccccc1')
>>> smiles = toolkit_registry.call('to_smiles', molecule)
The order of toolkits, as specified in toolkit_precedence
above, determines the order in which
the called method is resolved, i.e. if the toolkit with highest precedence has a to_smiles
method, that is the toolkit that will be called. If the toolkit with highest precedence does not
have such a method, it is attempted with other toolkits until one is found. By default, if a toolkit with an appropriately-named method raises an exception of any type, then iteration over the registered toolkits stops and that exception is raised. To continue iteration if specific exceptions are encountered, customize this behavior using the optional raise_exception_types
keyword argument to ToolkitRegistry.call
. If no registered
toolkits have the method, a ValueError is raised, containing a message listing the registered toolkits and exceptions (if any) that were ignored.
Alternatively, the global toolkit registry (which will attempt to register any available toolkits) can be used:
>>> from openff.toolkit.utils.toolkits import GLOBAL_TOOLKIT_REGISTRY as toolkit_registry
>>> len(toolkit_registry.registered_toolkits)
4
Individual toolkits can be registered or deregistered to control the backend that ToolkitRegistry calls resolve to. This can be useful for debugging and exploring subtley different behavior between toolkit wrappers.
from openff.toolkit.utils.toolkits import OpenEyeToolkitWrapper, BuiltInToolkitWrapper
from openff.toolkit.utils.toolkits import GLOBAL_TOOLKIT_REGISTRY as toolkit_registry
toolkit_registry.deregister_toolkit(OpenEyeToolkitWrapper)
toolkit_registry.register_toolkit(BuiltInToolkitWrapper)
toolkit_registry.registered_toolkits
For example, differences in to_smiles
functionality between OpenEye toolkits and The RDKit can
be explored by selecting which toolkit(s) are and are not registered.
>>> from openff.toolkit.utils.toolkits import OpenEyeToolkitWrapper, GLOBAL_TOOLKIT_REGISTRY as toolkit_registry
>>> from openff.toolkit import Molecule
>>> molecule = Molecule.from_smiles('Cc1ccccc1')
>>> smiles_via_openeye = toolkit_registry.call('to_smiles', molecule)
>>> print(smiles_via_openeye)
[H]c1c(c(c(c(c1[H])[H])C([H])([H])[H])[H])[H]
>>> toolkit_registry.deregister_toolkit(OpenEyeToolkitWrapper)
>>> smiles_via_rdkit = toolkit_registry.call('to_smiles', molecule)
>>> print(smiles_via_rdkit)
[H][c]1[c]([H])[c]([H])[c]([C]([H])([H])[H])[c]([H])[c]1[H]
Registry for ToolkitWrapper objects |
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Toolkit wrapper base class. |
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OpenEye toolkit wrapper |
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RDKit toolkit wrapper |
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AmberTools toolkit wrapper |
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Built-in ToolkitWrapper for very basic functionality. |
Serialization support
Mix-in to add serialization and deserialization support via JSON, YAML, BSON, TOML, MessagePack, and XML. |
Collections
Custom collections for the toolkit
A list that runs custom converter and validators when new elements are added. |
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A dict that runs custom converter and validators when new elements are added. |
Miscellaneous utilities
Miscellaneous utility functions.
Inherit docstrings from parent class |
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Recursively retrieve all subclasses of the specified class |
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Context to temporary change the working directory. |
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Get the full path to one of the reference files in testsystems. |
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Convert an 0.1-compliant SMIRNOFF dict to an 0.2-compliant one. |
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Convert an 0.2-compliant SMIRNOFF dict to an 0.3-compliant one. |
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Process a list of molecules with a specified SMIRNOFF ffxml file and determine which parameters are used by which molecules, returning collated results. |
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