On Apr 24, 2013, at 8:05, Haoyi Li <haoyi.sg@gmail.com> wrote:
You actually can get a syntax like that without macros, using stack-introspection, locals-trickery and lots of `eval`. The question is whether you consider macros more "extreme" than stack-introspection, locals-trickery and `eval`! A JIT compiler will probably be much happier with macros.

That last point makes this approach seem particularly interesting to me, which makes me wonder: Is your code CPython specific, or does it also work with PyPy (or Jython or Iron)? While PyPy is obviously a whole lot easier to mess with in the first place than CPython, having macros at the same language level as your code is just as interesting in both implementations.


On Wed, Apr 24, 2013 at 10:35 AM, Terry Jan Reedy <tjreedy@udel.edu> wrote:
On 4/23/2013 11:49 PM, Haoyi Li wrote:
I thought this may be of interest to some people on this list, even if
not strictly an "idea".

I'm working on MacroPy <https://github.com/lihaoyi/macropy>, a little

pure-python library that allows user-defined AST rewrites as part of the
import process (using PEP 302).

From the readme
'''
String Interpolation

a, b = 1, 2
c = s%"%{a} apple and %{b} bananas"
print c
#1 apple and 2 bananas
'''
I am a little surprised that you would base a cutting edge extension on Py 2. Do you have it working with 3.3 also?

'''Unlike the normal string interpolation in Python, MacroPy's string interpolation allows the programmer to specify the variables to be interpolated inline inside the string.'''

Not true as I read that.

a, b = 1, 2
print("{a} apple and {b} bananas".format(**locals()))
print("%(a)s apple and %(b)s bananas" % locals())
#1 apple and 2 bananas
#1 apple and 2 bananas

I rather like the anon funcs with anon params. That only works when each param is only used once in the expression, but that restriction is the normal case.

I am interested to see what you do with pattern matching.

tjr

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