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