Why is it impossible to create a compiler than can compile Python to machinecode like C?

[alex23]

On Mar 1, 1:47 pm, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> Cython is not a Python compiler. Cython code will not run in a vanilla
> Python implementation. It has different keywords and syntax, e.g.:
>
> cdef inline int func(double num):
>     ...
>
> which gives SyntaxError in a Python compiler.

Cython has had a "pure Python" mode for several years now that allows
you to decorate Python code or augment it with additional files
containing the C specific declarations:

http://docs.cython.org/src/tutorial/pure.html

Both of which will be ignored by the regular Python interpreter,
allowing you to write Python that is also suitable for Cython without
the errors you mention.