Merge branch 'master' into master

1 files changed, 24 insertions, 0 deletions

diff --git a/tablib/packages/statistics.py b/tablib/packages/statistics.py
new file mode 100644
index 0000000..e97a6c9
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+++ b/tablib/packages/statistics.py
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+from __future__ import division
+
+
+def median(data):
+    """
+    Return the median (middle value) of numeric data, using the common
+    "mean of middle two" method. If data is empty, ValueError is raised.
+
+    Mimics the behaviour of Python3's statistics.median
+
+    >>> median([1, 3, 5])
+    3
+    >>> median([1, 3, 5, 7])
+    4.0
+
+    """
+    data = sorted(data)
+    n = len(data)
+    if not n:
+        raise ValueError("No median for empty data")
+    i = n // 2
+    if n % 2:
+        return data[i]
+    return (data[i - 1] + data[i]) / 2