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authorStefan Krah <skrah@bytereef.org>2012-09-30 07:24:41 (GMT)
committerStefan Krah <skrah@bytereef.org>2012-09-30 07:24:41 (GMT)
commit9a3f05e60f7c620404ddb63dc1ef48b4a11ad78f (patch)
tree3564fd230ab28a302b66352dffc7fdac016f0d38 /Modules/_decimal
parent7d0d57f22c0fb808b72ef3dc32282a71d3a90012 (diff)
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Make it clear that the pi function is modified for benchmarking purposes.
Diffstat (limited to 'Modules/_decimal')
-rw-r--r--Modules/_decimal/tests/bench.py9
1 files changed, 7 insertions, 2 deletions
diff --git a/Modules/_decimal/tests/bench.py b/Modules/_decimal/tests/bench.py
index 7ab6b44..7e4a210 100644
--- a/Modules/_decimal/tests/bench.py
+++ b/Modules/_decimal/tests/bench.py
@@ -18,8 +18,13 @@ except ImportError:
C = import_fresh_module('decimal', fresh=['_decimal'])
P = import_fresh_module('decimal', blocked=['_decimal'])
-
-# Pi function from the decimal.py documentation
+#
+# NOTE: This is the pi function from the decimal documentation, modified
+# for benchmarking purposes. Since floats do not have a context, the higher
+# intermediate precision from the original is NOT used, so the modified
+# algorithm only gives an approximation to the correctly rounded result.
+# For serious use, refer to the documentation or the appropriate literature.
+#
def pi_float():
"""native float"""
lasts, t, s, n, na, d, da = 0, 3.0, 3, 1, 0, 0, 24