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Luciano Ramalho 2021-07-08 00:22:48 -03:00 committed by GitHub
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02-array-seq/lispy/py3.9/README.md
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@ -7,7 +7,7 @@ _Luciano Ramalho_
## Major changes ## Major changes
* Make the `lambda` form accept more than one expression as the body. This is consistent with _Scheme_ syntax, and provides a useful example for the book. To implement this: * Make the `lambda` form accept more than one expression as the body. This is consistent with [_Scheme_ syntax](https://web.mit.edu/scheme_v9.2/doc/mit-scheme-ref/Lambda-Expressions.html), and provides a useful example for the book. To implement this:
* In `Procedure.__call__`: evaluate `self.body` as a list of expressions, instead of a single expression. Return the value of the last expression. * In `Procedure.__call__`: evaluate `self.body` as a list of expressions, instead of a single expression. Return the value of the last expression.
* In `evaluate()`: when processing `lambda`, unpack expression into `(_, parms, *body)`, to accept a list of expressions as the body. * In `evaluate()`: when processing `lambda`, unpack expression into `(_, parms, *body)`, to accept a list of expressions as the body.
* Remove the `global_env` global `dict`. It is only used as a default value for the `env` parameter in `evaluate()`, but it is unsafe to use mutable data structures as parameter default values. To implement this: * Remove the `global_env` global `dict`. It is only used as a default value for the `env` parameter in `evaluate()`, but it is unsafe to use mutable data structures as parameter default values. To implement this:
@ -16,7 +16,7 @@ _Luciano Ramalho_
* Rewrite the custom test script * Rewrite the custom test script
[lispytest.py](https://github.com/norvig/pytudes/blob/705c0a335c1811a203e79587d7d41865cf7f41c7/py/lispytest.py) as [lispytest.py](https://github.com/norvig/pytudes/blob/705c0a335c1811a203e79587d7d41865cf7f41c7/py/lispytest.py) as
[lis_test.py](https://github.com/fluentpython/example-code-2e/blob/master/02-array-seq/lispy/py3.9/lis_test.py): [lis_test.py](https://github.com/fluentpython/example-code-2e/blob/master/02-array-seq/lispy/py3.9/lis_test.py):
a standard [pytest](https://docs.pytest.org) test suite including new test cases, preserving all Norvig's the test cases for a standard [pytest](https://docs.pytest.org) test suite including new test cases, preserving all Norvig's test cases for
[lis.py](https://github.com/norvig/pytudes/blob/705c0a335c1811a203e79587d7d41865cf7f41c7/py/lis.py) [lis.py](https://github.com/norvig/pytudes/blob/705c0a335c1811a203e79587d7d41865cf7f41c7/py/lis.py)
but removing the test cases for the features implemented only in but removing the test cases for the features implemented only in
[lispy.py](https://github.com/norvig/pytudes/blob/705c0a335c1811a203e79587d7d41865cf7f41c7/py/lispy.py) [lispy.py](https://github.com/norvig/pytudes/blob/705c0a335c1811a203e79587d7d41865cf7f41c7/py/lispy.py)