Macros for Python: Quasiquotes, Case Classes, LINQ and more!
Project description
MacroPy is an implementation of Macros in the Python Programming Language. MacroPy provides a mechanism for user-defined functions (macros) to perform transformations on the abstract syntax tree(AST) of Python code at module import time. This is an easy way to modify the semantics of a python program
Python like you’ve never seen before
MacroPy allows you to create constructs which are impossible to have in normal python code, such as:
Tracing
with trace:
sum([x + 5 for x in range(3)])
# sum([x + 5 for x in range(3)])
# range(3) -> [0, 1, 2]
# x + 5 -> 5
# x + 5 -> 6
# x + 5 -> 7
# [x + 5 for x in range(3)] -> [5, 6, 7]
# sum([x + 5 for x in range(3)]) -> 18Quick Lambdas
print map(f[_[0]], ['omg', 'wtf', 'bbq'])
# ['o', 'w', 'b']
print reduce(f[_ + _], ['omg', 'wtf', 'bbq'])
# 'omgwtfbbqCase Classes
@case
class Point(x, y): pass
p = Point(1, 2)
print str(p) #Point(1, 2)
print p.x #1
print p.y #2
print Point(1, 2) == Point(1, 2) # TrueAnd more! All this runs perfectly on vanilla Python 2.7 or PyPy 2.0. For more details, see the GitHub page. or ask in the Google Group.
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MacroPy-1.0.3.zip
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