def example_1():
print "example_1"
print "This example shows how multiple input streams are merged into a single output stream."
print "op(f, in_streams): f is a function from a list of lists to a list"
print "in_streams is a list of streams \n"
print "In this example, the input streams are x and y."
print "In this example, the function f() computes element by element sums of the input streams."
print ""
def f(in_streams):
return map(sum, zip(*in_streams))
x = Stream('x')
y = Stream('y')
a = merge_stateless(f, [x,y])
a.set_name('a')
x.extend([5, 11])
y.extend([2, 4, 5])
print "FIRST STEP"
print_streams_recent([x, y, a])
print""
x.extend([9, 15, 19, 8, 20])
y.extend([1, 3, 7])
print "SECOND STEP"
print_streams_recent([x, y, a])
def G(in_lists):
def f(in_lists):
return map(sum, zip(*in_lists))
return merge_stateless(f, in_lists)