1 files changed, 36 insertions, 0 deletions
diff --git a/test/stuff/test4.py b/test/stuff/test4.py
new file mode 100644
index 00000000..b2390a03
--- /dev/null
+++ b/test/stuff/test4.py
@@ -0,0 +1,36 @@
+import random, time
+
+class DelValue():
+	def a(d):
+		return dict((k, v) for k, v in d.items() if v is not 0)
+
+	def b(d):
+		for k, v in d.copy().items():
+			if v == 0: del d[k]
+		return d
+
+	def c(d):
+		for k in tuple(d.keys()):
+			if d[k] == 0: del d[k]
+		return d
+
+	def d(d):
+		for k, v in tuple(d.items()):
+			if v == 0: del d[k]
+		return d
+
+
+basedict = {}
+for i in range(200):
+	basedict[i] = random.randint(0, 1)
+
+expected = DelValue.a(basedict.copy())
+
+for algo in ['a', 'b', 'c', 'd']:
+	copy = basedict.copy()
+	t = time.time()
+	for i in range(100):
+		assert DelValue.__dict__[algo](copy) == expected
+	print("algorithm %s: %f" % (algo, time.time() - t))
+
+# c it is, although b is faster with smaller dictionaries