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- 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
- ```````
- .. code:: python
- 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)]) -> 18
- Quick Lambdas
- `````````````
- .. code:: python
- print map(f[_[0]], ['omg', 'wtf', 'bbq'])
- # ['o', 'w', 'b']
- print reduce(f[_ + _], ['omg', 'wtf', 'bbq'])
- # 'omgwtfbbq
- Case Classes
- ````````````
- .. code:: python
- @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) # True
- And more! All this runs perfectly on vanilla Python 2.7 or PyPy 2.0. For more
- details, see the `GitHub page <https://github.com/lihaoyi/macropy#macropy>`_.
- or ask in the `Google Group <https://groups.google.com/forum/#!forum/macropy>`_.
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