Category: Azure Bicep

Resolving error on Bicep module – on Azure CLI (2.22.0) for Windows 10

If you are seeing “fromisoformat” error while running az bicep version or any other az bicep command – you are not alone 🙂

Check this open issue reported on GitHub by community member – https://github.com/Azure/azure-cli/issues/17718


After updating to the latest Azure CLI (2.22.0) for Windows 10, I am now seeing the same error as others have reported:

Any command such as “az bicep version” is producing the following error:

The command failed with an unexpected error.
Here is the traceback and detailed error:
type object 'datetime.datetime' has no attribute 'fromisoformat'
Traceback (most recent call last):
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 231, in invoke
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/init.py", line 657, in execute
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/init.py", line 720, in _run_jobs_serially
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/init.py", line 691, in _run_job
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/init.py", line 328, in call
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/init.py", line 807, in default_command_handler
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/command_modules/resource/custom.py", line 3294, in build_bicep_file
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/command_modules/resource/_bicep.py", line 63, in run_bicep_command
File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/command_modules/resource/_bicep.py", line 152, in _load_bicep_version_check_result_from_cache
AttributeError: type object 'datetime.datetime' has no attribute 'fromisoformat'

Is there a temp workaround?

One of the workarounds is to uninstalled Azure CLI 2.22.0 , and then install the prior version 2.21.0. You could confirm 2.21.0 version is working for you by running the same command.

Hope this will be helpful for you, as i faced with this issue hours before my demo to #GlobalAzure 2021 😐

Transfrom your Azure ARM into Bicep during the Global Azure 2021

Global Azure 2021 event in mid-April.

Hello eveyone,
I am very happy to share exciting news with all of you.

Few days ago, i have receieved an email confirming acceptance of my both Azure sessions for the Global Azure 2021 event. I am truely trilled to present on April 16th and 17th following two sesions for eveyone live:

I am looking forward for your participiation, and tune in to learn about latest developments in Microsoft Azure.

In my first session i will share the following new session with you.

Abstract of the presentation as is:

Infrastructure as a Code (IaC) is important strategy to manage your digital estate in any cloud environment. Simplifying management of your infrastructure while re-using code is even better. In Microsoft Azure, we have ARM (Azure Resource Manager) templates that could declaratively define your cloud project infrastructure.

However, it is not easy to author ARM JSON templates and maintain them when your project grows and requires changes. In this demo heavy session, we will introduce the Azure Bicep language and demonstrate how it simplifies authoring ARM templates for your Azure infrastructure. We will author a manageable, readable, and modularized Azure infrastructure code, while using familiar tools.

TheCloudMarathoner 🙂

Please let me know, what topics are you interested in?