cixuuz opened a new pull request #4991: [AIRFLOW-4170] Try serialize value by JSON when importing Variables URL: https://github.com/apache/airflow/pull/4991 Make sure you have checked _all_ steps below. ### Jira - [ ] My PR addresses the following [Airflow 4170](https://issues.apache.org/jira/browse/AIRFLOW-4170) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR" - https://issues.apache.org/jira/browse/AIRFLOW-XXX - In case you are fixing a typo in the documentation you can prepend your commit with \[AIRFLOW-XXX\], code changes always need a Jira issue. - In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)). - In case you are adding a dependency, check if the license complies with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x). ### Description - [ ] Here are some details about my PR, including screenshots of any UI changes: When importing variables from a file, it serializes value in JSON only when value is dict. But value may be list or other valid JSON type. For example, the value is a list of string, ```["example"]```. First, export values into a file. In file, it looks like ```{"key": ["example"]}```, and then import the file to variables, it will be stored as ```['example']```. You may get a JSONdecodeerror when you try to get the value because it's not double quote. Thus, instead of judging by type, we could blindly try dump variables as JSON. ### Tests - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: ### Commits - [ ] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 1. Subject is limited to 50 characters (not including Jira issue reference) 1. Subject does not end with a period 1. Subject uses the imperative mood ("add", not "adding") 1. Body wraps at 72 characters 1. Body explains "what" and "why", not "how" ### Documentation - [ ] In case of new functionality, my PR adds documentation that describes how to use it. - When adding new operators/hooks/sensors, the autoclass documentation generation needs to be added. - All the public functions and the classes in the PR contain docstrings that explain what it does - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release ### Code Quality - [ ] Passes `flake8`
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