Azure-cli: No module named 'decorator' exception, fixed by installing 'decorator' package

[ewh]

This is autogenerated. Please review and update as needed.

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]

Here's the full stack-trace output:

The command failed with an unexpected error. Here is the traceback:

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

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/knack/cli.py", line 206, in invoke
    cmd_result = self.invocation.execute(args)
  File "/usr/lib/python3/dist-packages/azure/cli/core/commands/__init__.py", line 528, in execute
    self.commands_loader.load_arguments(command)
  File "/usr/lib/python3/dist-packages/azure/cli/core/__init__.py", line 299, in load_arguments
    self.command_table[command].load_arguments()  # this loads the arguments via reflection
  File "/usr/lib/python3/dist-packages/azure/cli/core/commands/__init__.py", line 291, in load_arguments
    super(AzCliCommand, self).load_arguments()
  File "/usr/lib/python3/dist-packages/knack/commands.py", line 97, in load_arguments
    cmd_args = self.arguments_loader()
  File "/usr/lib/python3/dist-packages/azure/cli/core/__init__.py", line 496, in default_arguments_loader
    op = handler or self.get_op_handler(operation, operation_group=kwargs.get('operation_group'))
  File "/usr/lib/python3/dist-packages/azure/cli/core/__init__.py", line 536, in get_op_handler
    op = import_module(mod_to_import)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib/python3/dist-packages/azure/cli/command_modules/appservice/custom.py", line 25, in <module>
    from fabric import Connection
  File "/usr/lib/python3/dist-packages/fabric/__init__.py", line 3, in <module>
    from .connection import Config, Connection
  File "/usr/lib/python3/dist-packages/fabric/connection.py", line 10, in <module>
    from decorator import decorator
ModuleNotFoundError: No module named 'decorator'

[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?

[msftbot[bot]]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @AzureAppServiceCLI, @antcp.

[yungezz]

routing to appropriate team.

[panchagnula]

@yungezz @ewh from the above comment it seems like the azure-cli package was not installed properly or the extension being used is causing some errors. I tried this on the latest azure-cli version without any extensions & it works fine. Please try a clean install without any extensions and let us know if this is still an issue.

[panchagnula]

Not specific to web apps but something to do with the packages installed during core install.

[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

[fengzhou-msft]

Duplicate of #14011