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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.

src/n/i/nibabel-HEAD/nibabel/fileslice.py   nibabel(Download)
from .externals.six import integer_types
from .externals.six.moves import reduce
import numpy as np
    nbytes = reduce(operator.mul, shape) * dtype.itemsize
    bytes = fileobj.read(nbytes)
    new_arr = np.ndarray(shape, dtype, buffer=bytes, order=order)
    segments, sliced_shape, post_slicers = calc_slicedefs(
        sliceobj, shape, itemsize, offset, order)
    n_bytes = reduce(operator.mul, sliced_shape, 1) * itemsize
    bytes = read_segments(fileobj, segments, n_bytes)
    sliced = np.ndarray(sliced_shape, dtype, buffer=bytes, order=order)

src/n/i/nibabel-HEAD/nibabel/eulerangles.py   nibabel(Download)
import math
from .externals.six.moves import reduce
import numpy as np
                 [0, sinx, cosx]]))
    if Ms:
        return reduce(np.dot, Ms[::-1])
    return np.eye(3)