PyCharm file watchers (black, isort), cf. https://www.jetbrains.com/help/pycharm/using-file-watchers.html

watchers.xml

<TaskOptions>
  <TaskOptions>
    <option name="arguments" value="$FilePath$" />
    <option name="checkSyntaxErrors" value="true" />
    <option name="description" />
    <option name="exitCodeBehavior" value="ERROR" />
    <option name="fileExtension" value="py" />
    <option name="immediateSync" value="false" />
    <option name="name" value="Format code using black" />
    <option name="output" value="$FilePath$" />
    <option name="outputFilters">
      <array />
    </option>
    <option name="outputFromStdout" value="false" />
    <option name="program" value="$PyInterpreterDirectory$/black" />
    <option name="runOnExternalChanges" value="false" />
    <option name="scopeName" value="Project Files" />
    <option name="trackOnlyRoot" value="false" />
    <option name="workingDir" value="$ProjectFileDir$" />
    <envs />
  </TaskOptions>
  <TaskOptions>
    <option name="arguments" value="$FilePath$" />
    <option name="checkSyntaxErrors" value="true" />
    <option name="description" />
    <option name="exitCodeBehavior" value="ERROR" />
    <option name="fileExtension" value="py" />
    <option name="immediateSync" value="false" />
    <option name="name" value="Format imports using isort" />
    <option name="output" value="$FilePath$" />
    <option name="outputFilters">
      <array />
    </option>
    <option name="outputFromStdout" value="false" />
    <option name="program" value="$PyInterpreterDirectory$/isort" />
    <option name="runOnExternalChanges" value="false" />
    <option name="scopeName" value="Project Files" />
    <option name="trackOnlyRoot" value="false" />
    <option name="workingDir" value="$ProjectFileDir$" />
    <envs />
  </TaskOptions>
</TaskOptions>