U /el @sddZddlmZddlZeeZddlmZddl m Z dZ ddd d d Z ddd d ddZ dS)z& Utilities for checking dependencies ) annotationsN) import_module) ModuleType)import_optionalimport_requiredstrzModuleType | None)mod_namereturncCsLz t|WStk rYn*tk rFd|d}t|YnXdS)a Attempt to import an optional dependency. Silently returns None if the requested module is not available. Args: mod_name (str) : name of the optional module to try to import Returns: imported module or None, if import fails z"Failed to import optional module ``N)r ImportError Exceptionlog exception)rmsgr;/tmp/pip-unpacked-wheel-f5fndrjf/bokeh/util/dependencies.pyr(s   rr)r error_msgr c Cs<z t|WStk r6}zt||W5d}~XYnXdS)aY Attempt to import a required dependency. Raises a RuntimeError if the requested module is not available. Args: mod_name (str) : name of the required module to try to import error_msg (str) : error message to raise when the module is missing Returns: imported module Raises: RuntimeError N)rr RuntimeError)rrerrrr?s r)__doc__ __future__rlogging getLogger__name__r importlibrtypesr__all__rrrrrrs