I looked around for more stuff we could remove from stdlib. One idea would be to remove some of the text encodings, the stdlib defines ~250 text encodings which take up 1.7mb of disk space. If we reduce it to ~20 encodings then that saves 1.5mb, which seems to be around 600kb compressed. Other than that, it's a bit hard to know what we could take out.

I removed another copy of those same executables from the standard library too.

Edit I can't see those in

>>> os.listdir('/lib/python3.8/distutils/')  # including sub-folders
os.listdir('/lib/python3.8/distutils/')

and the size decrease of pyodide.asm.data is too small to account for it.
Maybe they were already excluded in some other way?

Master

-rw-r--r-- 1 root root 580K Apr 13 21:22 distlib.data
-rw-r--r-- 1 root root  13K Apr 13 21:22 distlib.js
[..]
-rw-r--r-- 1 root root 5.2M Apr 13 21:21 pyodide.asm.data
-rw-r--r-- 1 root root 3.6M Apr 13 21:22 pyodide.asm.js
-rwxr-xr-x 1 root root  11M Apr 13 21:22 pyodide.asm.wasm
-rw-r--r-- 1 root root  30K Apr 13 21:22 pyodide.js

This PR,

-rw-r--r-- 1 root root 294K Apr 14 06:01 distlib.data
-rw-r--r-- 1 root root 9.5K Apr 14 06:01 distlib.js
[...]
-rw-r--r-- 1 root root 5.1M Apr 14 06:00 pyodide.asm.data
-rw-r--r-- 1 root root 3.6M Apr 14 06:01 pyodide.asm.js
-rwxr-xr-x 1 root root  11M Apr 14 06:01 pyodide.asm.wasm

If we reduce it to ~20 encodings then that saves 1.5mb, which seems to be around 600kb compressed.

Nice! As long as it's not difficult to determine which ones to keep.

Other than that, it's a bit hard to know what we could take out.

I think there is lots of things we can do in that direction, but I would rather leave it for the next release. #646

leave it for the next release

Indeed, I'm getting distracted here.

Edit I can't see those in
...
Maybe they were already excluded in some other way?

I think I was confused about this. I now believe that the .exe filter is not needed, I'll remove it.