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44 lines
1.2 KiB
Python
44 lines
1.2 KiB
Python
# Python 3.0 comprehensions can produce different code from
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# all other Python versions. Thanks, Python!
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# This code is RUNNABLE!
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# Adapted from 3.0 ast.py; uses comprehension implemented via CLOSURE
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def _format(node):
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return [(a, int(b)) for a, b in node.items()]
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x = {'a': '1', 'b': '2'}
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assert [('a', 1), ('b', 2)] == _format(x)
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# Adapted from 3.0 cmd.py; ises "if" comprehension
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def monthrange(ary, dotext):
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return [a[3:] for a in ary if a.startswith(dotext)]
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ary = ["Monday", "Twoday", "Monmonth"]
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assert ['day', 'month'] == monthrange(ary, "Mon")
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# From 3.0 cmd.py; uses "if not" comprehension
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def columnize(l):
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return [i for i in range(len(l))
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if not isinstance(l[i], str)]
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assert [0, 2] == columnize([1, 'a', 2])
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# From 3.7.6 _collections_abc.py
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# Bug was handling "or" in listcomp
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def count(values, x):
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return sum(1 for v in values if v or x)
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assert count([2, 2], False) == 2
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assert count([], False) == 0
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assert count([], True) == 0
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assert count([2], True) == 1
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assert count([0], False) == 0
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# From 3.7 test_generators
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# Bug was in handling the way list_if is optimized in 3.7+;
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# We need list_if37 and compare_chained37.
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def init_board(c):
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return [io for io in c if 3 <= io < 5]
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assert init_board(list(range(6))) == [3, 4]
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