Moving from bpo-29326
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Hi Steve.

I'll try to explain what is my motivation.

I need a reliable way to run Python (not matter embedded or not) in isolated mode, but still having current directory in `sys.path` (empty entry).

Ironically I could misuse normal mode to simulate isolated mode with specified %PYTHONPATH% (which is not much handy, by the way), but hiding Windows Registry keys would look pretty hard (it is impossible to make a bat/cmd wrapper). Possibility to search %PYTHONPATH% in HKLM entries makes it even worse.

Empty entry in `sys.path` is a extremely popular thing, and many software depend on it. It looks like a bug that isolated mode cannot support such entry.

# How would I fix it.

Possibly we should allow another keyword for adding an empty entry (like we have an exclusion for `import site`).

Ideas are appreciated.

If your ._pth includes `import site`, then including a blank line in a `anything.pth` file should add the entry.

Alternatively, if you can add "import sys; sys.path.insert(0, '')" to the start of your code that depends on it you should be fine.

Unfortunately this is not true: "Blank lines and lines beginning with # are skipped." (https://docs.python.org/3/library/site.html#index-1)
I'm not sure we should change this behavior as it would make huge impact on usage of `pth` files by users (`._pth`, on the contrary, is the only one per distribution and managed by the distribution).

I could easily add `''` to `sys.path` manually if I had one script or even dozen of them, but as the solution that alternative is not acceptable. :(

You could add the line

    import sys; sys.path.insert(0, '')

to a .pth file. The documentation you pointed out states that lines starting with "import" are executed...