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# (C) Copyright 2006-2025 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
""" Utilities for handling optional dependencies so that tests for
optional features can be skipped gracefully.
"""
import importlib
import unittest
def optional_import(name):
"""
Optionally import a module, returning None if that module is unavailable.
Parameters
----------
name : Str
The name of the module being imported.
Returns
-------
None or module
None if the module is not available, and the module otherwise.
"""
try:
module = importlib.import_module(name)
except ImportError:
return None
else:
return module
numpy = optional_import("numpy")
requires_numpy = unittest.skipIf(numpy is None, "NumPy not available")
pandas = optional_import("pandas")
requires_pandas = unittest.skipIf(pandas is None, "Pandas not available")
tables = optional_import("tables")
requires_tables = unittest.skipIf(tables is None, "PyTables not available")
configobj = optional_import("configobj")
requires_configobj = unittest.skipIf(
configobj is None, "configobj not available"
)
pyface = optional_import("pyface")
requires_pyface = unittest.skipIf(pyface is None, "Pyface not available")
traitsui = optional_import("traitsui")
requires_traitsui = unittest.skipIf(traitsui is None, "TraitsUI not available")
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