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"""
Stand-alone module to provide information about whether optional deps exist.
"""
from __future__ import absolute_import
from importlib import import_module
import logging
import sys
logger = logging.getLogger(__name__)
_not_importable = set()
def get_module(name, should_load=True):
"""
Return module or None. Absolute import is required.
:param (str) name: Dot-separated module path. E.g., 'scipy.stats'.
:raise: (ImportError) Only when exc_msg is defined.
:return: (module|None) If import succeeds, the module will be returned.
"""
if name in sys.modules:
return sys.modules[name]
if not should_load:
return None
if name not in _not_importable:
try:
return import_module(name)
except ImportError:
_not_importable.add(name)
except Exception as e:
_not_importable.add(name)
msg = "Error importing optional module {}".format(name)
logger.exception(msg)
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