lazy_import

Lazy import a module and class.

Functions

safe_import(module_names, install_message)

Safely import a module and raise an ImportError with the install message if the module is not found.

Classes

LazyImport(import_path, optional_package, ...)	Lazy import a module and class.
OptionalPackages(value[, names, module, ...])	Enum for optional packages that can be used in the library.

class OptionalPackages(value, names=None, *, module=None, qualname=None, type=None, start=1, boundary=None)

Bases: Enum

Enum for optional packages that can be used in the library.

The package name and error message are defined for each optional package as a tuple.

The value of the tuple: - The package name (str): The package name to import. Follows the right syntax: such as import azure.identity but the package itself is azure-identity.

Support a list of package names for related packages. This will be importing a list of packages while safe_import is used.

• The error message (str): The message to display if the package is not found.

Example of using multiple related packages:

from adalflow.utils.lazy_import import safe_import, OptionalPackages
import sys

azure_modules = safe_import(
OptionalPackages.AZURE.value[0],  # List of package names
OptionalPackages.AZURE.value[1],  # Error message
)
# Manually add each module to sys.modules to make them available globally as if imported normally
azure_module_names = OptionalPackages.AZURE.value[0]
for name, module in zip(azure_module_names, azure_modules):
    sys.modules[name] = module

# Use the modules as if they were imported normally
from azure.identity import DefaultAzureCredential, get_bearer_token_provider

GROQ = ('groq', 'Please install groq with: pip install groq')

OPENAI = ('openai', 'Please install openai with: pip install openai')

ANTHROPIC = ('anthropic', 'Please install anthropic with: pip install anthropic')

GOOGLE_GENERATIVEAI = ('google.generativeai', 'Please install google-generativeai with: pip install google-generativeai')

TRANSFORMERS = ('transformers', 'Please install transformers with: pip install transformers')

COHERE = ('cohere', 'Please install cohere with: pip install cohere')

OLLAMA = ('ollama', 'Please install ollama with: pip install ollama')

BOTO3 = (['boto3', 'botocore'], 'Please install boto3 and botocore with: pip install boto3 botocore')

TORCH = ('torch', 'Please install torch with: pip install torch')

AZURE = (['azure.identity', 'azure.core'], 'Please install Azure packages with: pip install azure-identity azure-core azure-ai-formrecognizer azure-ai-textanalytics')

TOGETHER = ('together', 'Please install together with: pip install together')

MISTRAL = ('mistralai', 'Please install mistralai with: pip install mistrali')

FIREWORKS = ('fireworks-ai', 'Please install fireworks-ai with: pip install fireworks-ai')

FAISS = ('faiss', 'Please install faiss with: pip install faiss-cpu (or faiss if you use GPU)')

LANCEDB = ('lancedb', 'Please install lancedb with: pip install lancedb .')

SQLALCHEMY = ('sqlalchemy', 'Please install sqlalchemy with: pip install sqlalchemy')

PGVECTOR = ('pgvector', 'Please install pgvector with: pip install pgvector')

DATASETS = ('datasets', 'Please install datasets with: pip install datasets')

QDRANT = ('qdrant-client', 'Please install qdrant-client with: pip install qdrant-client')

class LazyImport(import_path: str, optional_package: OptionalPackages, *args, **kwargs)

Bases: object

Lazy import a module and class.

It is a proxy. The class/func will be created only when the class is instantiated or called.

Note

Do not subclass a lazy imported class.

Mainly internal library use to import optional packages only when needed.

Parameters:

• import_path (str) – The import path of the module and class, eg. “adalflow.components.model_client.openai_client.OpenAIClient”.

• optional_package (OptionalPackages) – The optional package to import, it helps define the package name and error message.

load_class()

safe_import(module_names: str | List[str], install_message: str) → ModuleType | List[ModuleType]

Safely import a module and raise an ImportError with the install message if the module is not found.

Handles importing of multiple related packages.

Parameters:

• module_names (list or str) – The package name(s) to import.

• install_message (str) – The message to display if import fails.

Returns:

The imported module.

Return type:

ModuleType

Raises:

ImportError – If any of the packages are not found.

Example:

1. Tests

try:
    numpy = safe_import("numpy", "Please install numpy with: pip install numpy")
    print(numpy.__version__)
except ImportError as e:
    print(e)

When numpy is not installed, it will raise an ImportError with the install message. When numpy is installed, it will print the numpy version.

2. Use it to delay the import of optional packages in the library.

from adalflow.utils.lazy_import import safe_import, OptionalPackages

numpy = safe_import(OptionalPackages.NUMPY.value[0], OptionalPackages.NUMPY.value[1])