Colab CLI 0.6.0 crashes with `jupyter-kernel-client` 1.0.0

[GeneCodeSavvy]

google-colab-cli 0.6.0 depends on jupyter-kernel-client without an upper
version bound but still calls the removed KernelClient API.

Reproduction

echo "print('Hello')" | colab exec

Error

AttributeError: module 'jupyter_kernel_client' has no attribute 'KernelClient'

Environment:

• google-colab-cli==0.6.0
• jupyter-kernel-client==1.0.0
• Python 3.12

Pinning jupyter-kernel-client==0.9.0 fixes it.

Suggested fix: support the 1.x API or temporarily constrain the dependency to
jupyter-kernel-client<1

should I open a PR?

[vanik85]

Confirming independent repro on macOS (fresh uv tool install google-colab-cli, arm64):

echo "print('Hello')" | colab exec
...
AttributeError: module 'jupyter_kernel_client' has no attribute 'KernelClient'

Pinning jupyter-kernel-client==0.15.0 (in addition to 0.9.0 mentioned above) also resolves it — so anything before the 1.0.0 rename works. Agree the cleanest fix is constraining to jupyter-kernel-client<1 in pyproject.toml/setup metadata until the 1.x API is supported.

[yunho-c]

I also encountered this error. I think a PR would be great @GeneCodeSavvy !

[makao007]

install the latest version will fix this issue.
pip install git+https://github.com/googlecolab/google-colab-cli.git