No module named 'decorator' exception, fixed by installing 'decorator' package

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Describe the bug

Command Name az webapp list

Errors:

No module named 'decorator'
Traceback (most recent call last):
python3/dist-packages/fabric/connection.py, ln 5, in <module>
    from invoke.vendor.six import StringIO
ModuleNotFoundError: No module named 'invoke.vendor.six'

...

python3/dist-packages/fabric/connection.py, ln 10, in <module>
    from decorator import decorator
ModuleNotFoundError: No module named 'decorator'

To Reproduce:

Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

• Put any pre-requisite steps here…
• az webapp list

Expected Behavior

Environment Summary

Linux-5.4.0-28-generic-x86_64-with-glibc2.29
Python 3.8.2
Shell: bash

azure-cli 2.0.81

Extensions:
azure-devops 0.17.0

Additional Context

[ewh]

I got around this by adding the decorator package to my system python3 site-packages. I ran this:

sudo /usr/bin/pip3 install --system decorator

Should this be required? Is the Linux installation of az not fully installing all its needed dependencies?

[fengzhou-msft]

You are using an old version not from the microsoft repo. Please see instructions on updating to the latest official version: https://github.com/Azure/azure-cli/issues/14011#issue-640943121