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Task/Catamorphism/Python/catamorphism-1.py

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+>>> # Python 2.X
+>>> from operator import add
+>>> listoflists = [['the', 'cat'], ['sat', 'on'], ['the', 'mat']]
+>>> help(reduce)
+Help on built-in function reduce in module __builtin__:
+
+reduce(...)
+    reduce(function, sequence[, initial]) -> value
+
+    Apply a function of two arguments cumulatively to the items of a sequence,
+    from left to right, so as to reduce the sequence to a single value.
+    For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates
+    ((((1+2)+3)+4)+5).  If initial is present, it is placed before the items
+    of the sequence in the calculation, and serves as a default when the
+    sequence is empty.
+
+>>> reduce(add, listoflists, [])
+['the', 'cat', 'sat', 'on', 'the', 'mat']
+>>>