Python version specified in Download and install page

[friesga]

The Download and Install page states that at least Python 3.8 or newer is required to install Emscripten. That might be true - the installation succeeds with Python version 3.9 - but after installation "emcc --version" crashes with a syntax error in a Python script. Installing Python version 3.14 resolved the issue. It might be recommendable to specify on this page the Python version actually required to run emcc.

[sbc100]

Yes, its a little confusing. We should certainly fix that.

Sadly its a little over-complicated today:

emscripten itself depends on python 3.10.

However, the emsdk python script that installs emscripten (along with its dependencies) only depend on python 3.2 today.

On mac and windows, emsdk will also install python itself, so you there is no need to install anything more recent than 3.2 youself.

On linux you will need at least 3.10 installed to run emcc.

[sbc100]

emsdk min version (3.2): https://github.com/emscripten-core/emsdk/blob/14c18b569f55138fe4963924162244251f454fb0/emsdk.py#L31-L33

emscripten min version (3.10):

emscripten/tools/shared.py

Lines 22 to 25 in d74f269

	# We depend on python 3.10 features
	if sys.version_info < (3, 10): # noqa: UP036
	print(f'error: emscripten requires python 3.10 or above ({sys.executable} {sys.version})', file=sys.stderr)
	sys.exit(1)

[sbc100]

I improved the error message in #26334 so nobody should see syntax error anymore

[friesga]

Thanks for the swift actions!