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3 Commits

Author SHA1 Message Date
Damien George
791b65f4b2 py/modmicropython: Add micropython.const, alias for identity function. 
Having a micropython.const identity function, and writing "from micropython
import const" at the start of scripts that use the const feature, allows to
write scripts which are compatible with CPython, and with uPy builds that
don't include const optimisation.

This patch adds such a function and updates the tests to do the import.
 2016-09-27 13:34:21 +10:00
Damien George
b1533c4366 py/parse: Treat constants that start with underscore as private. 
Assignments of the form "_id = const(value)" are treated as private
(following a similar CPython convention) and code is no longer emitted
for the assignment to a global variable.

See issue #2111.
 2016-06-06 17:28:32 +01:00
Damien George
ffae48d750 py, compiler: Add basic support for A=const(123). 
You can now do:

    X = const(123)
    Y = const(456 + X)

and the compiler will replace X and Y with their values.

See discussion in issue #266 and issue #573.
 2014-05-08 15:58:39 +00:00