util.py 文件源码

def has_module(module_name):
    """Check to see if a python module is available.
    """
    if sys.version_info > (3, ):
        import importlib
        return importlib.find_loader(module_name) is not None
    else:  # pragma: no cover
        import imp
        try:
            imp.find_module(module_name)
        except ImportError:
            return False
        return True