Mike Orr avatar Mike Orr committed cbb0deb

Counter.correlate() class method.

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         return data
+    @classmethod
+    def correlate(class_, iterable):
+        """Build a Counter from an iterable in one step.
+        This is the same as adding each item individually.
+        >>> counter = Counter.correlate(["A", "B", "A"])
+        >>> counter.result["A"]
+        2
+        >>> counter.result["B"]
+        1
+        """
+        counter = class_()
+        for elm in iterable:
+            counter(elm)
+        return counter
 class Accumulator(object):
     """Accumulate a dict of all values for each key.
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