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Hello ! hope you're having a good day.
I have a simple question, why can't we write custom Filesystems inheriting from `WritableFileSystem` ?
With this code
```In [6]: class MyFS(WritableFileSystem):
   ...:     _basepath = ""
   ...:     def read_path(self, path):
   ...:         return
   ...:     def write_path(self, path, content):
   ...:         return
In [7]: MyFS()```
I get the following error
```OSError: source code not available```

Hi <@U04JN3MFQ6T>

can you try defining your filesystem in a file instead of ipython?