fix version check

Author: blink1073

jupyter_client/__init__.py

@@ -3,15 +3,21 @@
 from ._version import protocol_version  # noqa
 from ._version import protocol_version_info  # noqa
 from ._version import version_info  # noqa
-from .asynchronous import AsyncKernelClient  # noqa
-from .blocking import BlockingKernelClient  # noqa
-from .client import KernelClient  # noqa
-from .connect import *  # noqa
-from .launcher import *  # noqa
-from .manager import AsyncKernelManager  # noqa
-from .manager import KernelManager  # noqa
-from .manager import run_kernel  # noqa
-from .multikernelmanager import AsyncMultiKernelManager  # noqa
-from .multikernelmanager import MultiKernelManager  # noqa
-from .provisioning import KernelProvisionerBase  # noqa
-from .provisioning import LocalProvisioner  # noqa
+
+try:
+    from .asynchronous import AsyncKernelClient  # noqa
+    from .blocking import BlockingKernelClient  # noqa
+    from .client import KernelClient  # noqa
+    from .connect import *  # noqa
+    from .launcher import *  # noqa
+    from .manager import AsyncKernelManager  # noqa
+    from .manager import KernelManager  # noqa
+    from .manager import run_kernel  # noqa
+    from .multikernelmanager import AsyncMultiKernelManager  # noqa
+    from .multikernelmanager import MultiKernelManager  # noqa
+    from .provisioning import KernelProvisionerBase  # noqa
+    from .provisioning import LocalProvisioner  # noqa
+except ModuleNotFoundError:
+    import warnings
+
+    warnings.warn("Could not import submodules")