Add subdirectories

Add /ipynb/ and /py/ subdirectories to keep the home page neater.

py/testaccum.py

@@ -0,0 +1,73 @@
+from __future__ import division
+import re
+from accum import *
+
+
+acc_re = re.compile("[[](.+):(.+) for (.+) in (.+)[]]")
+
+def expand_accumulations(program_text):
+    """Replace any accumulation displays in program_text with calls to
+    accumulation.  Used to simulate a hypothetical Python interpreter that
+    actually handles accumlation displays. This one is rather poor: it
+    won't match across lines, it won't match nested accumulation displays,
+    and it doesn't handle multiple 'for' clauses; nor 'if' clauses."""
+    def _(matchobj):
+        (acc, exp, x, it) = matchobj.groups()
+        return "accumulation(%s, lambda %s: (%s), %s)" % (acc, x, exp, it)
+    return acc_re.sub(_, program_text)
+
+def test1(acc_display, expected):
+    "Eval an accumulation display and see if it gets the expected answer."
+    print acc_display
+    result = eval(expand_accumulations(acc_display))
+    assert result == expected, ('Got %s; expected %s' % (result, expected))
+    print '    ==>  %s' % result
+
+#### Initialize some data
+temp = [70, 70, 71, 74, 76, 76, 72, 76, 77, 77, 77, 78,
+        78, 79, 79, 79, 78, 80, 82, 83, 83, 81, 84, 83]
+data = temp
+def f(x): return 2 * x
+votes = {'Arnie': 48, 'Gray': 45, 'Tom': 13, 'Cruz': 32, 'Peter': 3}
+candidates = votes.keys()
+
+def test():
+
+    print 'temp = ', temp
+    print 'data = temp'
+    print 'votes = ', votes
+    print 'candidates = ', candidates
+    print
+    
+    #### Test some accumulation displays
+    test1("[Max: temp[hour] for hour in range(24)]",
+          max([temp[hour] for hour in range(24)]))
+    test1("[Min: temp[hour] for hour in range(24)]",
+          min([temp[hour] for hour in range(24)]))
+    test1("[Sum: x*x for x in data]",
+          sum([x*x for x in data]))
+    test1("[Mean: f(x) for x in data]",
+          sum([f(x) for x in data])/len(data))
+    test1("[Median: f(x) for x in data]",
+          156.0)
+    test1("[Mode: f(x) for x in data]",
+          166)
+    test1("[Argmax: votes[c] for c in candidates]",
+          'Arnie')
+    test1("[Argmin: votes[c] for c in candidates]",
+          'Peter')
+    test1("[Some: temp[hour] > 75 for hour in range(24)]",
+          len([hour for four in range(24) if temp[hour] > 75])>0)
+    test1("[Every: temp[hour] > 75 for hour in range(24)]",
+          len([h for h in range(24) if temp[h] > 75]) == 24)
+    test1("[Top(10): temp[hour] for hour in range(24)]",
+          [84, 83, 83, 83, 82, 81, 80, 79, 79, 79])
+    test1("[Join(', '): votes[c] for c in candidates]",
+                       ', '.join([str(votes[c]) for c in candidates]))
+    test1("[SortBy: abs(x) for x in (-2, -4, 3, 1)]",
+          [1, -2, 3, -4])
+    test1("[SortBy(reverse=True): abs(x) for x in (-2, -4, 3, 1)]",
+          [-4, 3, -2, 1])
+
+if __name__ == "__main__":
+    test()