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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`FileExistsError` error when `psyplot` is imported from multiple parallel processes","articleBody":"Hello!\r\n\r\nFirst of all, thanks for this great package!!\r\n\r\n#### Problem description\r\n\r\nWe (the [ESMValTool](https://github.com/ESMValGroup/ESMValTool) community) found an issue when importing `psyplot` from different parallel processes in a test environment, which leads to a race condition where the package finds that it has no config file and tries to create that, but two processes try that at the same time, resulting in a `FileExistsError: [Errno 17] File exists: '/Users/runner/.config/psyplot'`. Note that we only found this behavior for OSX.\r\n\r\n#### Code Sample, a copy-pastable example if possible\r\n\r\nAn error on our CI machine using the import below is given [here](https://github.com/ESMValGroup/ESMValTool/runs/6470528634?check_suite_focus=true),\r\n\r\n```python\r\nfrom psyplot.config.logsetup import _get_home\r\n```\r\n\r\nbut we also found the [same problem](https://github.com/ESMValGroup/ESMValTool/runs/6462593093?check_suite_focus=true#step:7:50) when using\r\n\r\n```python\r\nimport psyplot.project as psy\r\n```\r\n\r\nPlease note that due to the race condition, the error cannot be reproduced consistently.\r\n\r\n#### Expected Output\r\n\r\nNo error and no race condition.\r\n\r\n#### Full error message\r\n\r\n\u003cdetails\u003e\r\n\r\n```bash\r\n tests/unit/test_platform.py:4: in \u003cmodule\u003e\r\n    from psyplot.config.logsetup import _get_home\r\n../../../miniconda3/envs/esmvaltool/lib/python3.9/site-packages/psyplot/__init__.py:30: in \u003cmodule\u003e\r\n    from psyplot.config.rcsetup import rcParams\r\n../../../miniconda3/envs/esmvaltool/lib/python3.9/site-packages/psyplot/config/__init__.py:42: in \u003cmodule\u003e\r\n    config_path = psyplot_fname()\r\n../../../miniconda3/envs/esmvaltool/lib/python3.9/site-packages/psyplot/config/rcsetup.py:978: in psyplot_fname\r\n    configdir = get_configdir()\r\n../../../miniconda3/envs/esmvaltool/lib/python3.9/site-packages/psyplot/config/rcsetup.py:1028: in get_configdir\r\n    os.makedirs(p)\r\n../../../miniconda3/envs/esmvaltool/lib/python3.9/os.py:225: in makedirs\r\n    mkdir(name, mode)\r\nE   FileExistsError: [Errno 17] File exists: '/Users/runner/.config/psyplot'\r\n```\r\n\r\n\u003c/details\u003e\r\n\r\n#### Output of ``psyplot -aV``\r\n\r\n\u003cdetails\u003e\r\n\r\n```\r\npsyplot:\r\n  requirements:\r\n    matplotlib: 3.5.2\r\n    numpy: 1.22.3\r\n    pandas: 1.4.2\r\n    python: 3.8.13 | packaged by conda-forge\r\n    xarray: 2022.3.0\r\n  version: 1.4.2\r\n```\r\n\r\n\u003c/details\u003e\r\n\r\n#### NOTE\r\nThis is a bug report.\r\n\r\nFor requesting new features, use [this template](https://github.com/psyplot/psyplot/issues/new?template=new_feature.md\u0026title=NEW+FEATURE:).\r\n\r\nFor changing existing features, use [this template](https://github.com/psyplot/psyplot/issues/new?template=change_feature.md\u0026title=CHANGE+FEATURE:).\r\n","author":{"url":"https://github.com/schlunma","@type":"Person","name":"schlunma"},"datePublished":"2022-05-17T14:46:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/52/psyplot/issues/52"}