def test():
# Create stream x and give it names 'x'.
x = StreamArray('input')
# v is the stream returned by stream_cumulative(x) and
v = stream_cumulative(x)
# avg is the stream returned by stream_average(x)
avg = stream_average(x)
# Give names to streams. This is helpful in reading output.
v.set_name('cumulative sum of input')
avg.set_name('average of input')
check(v, [3.0, 8.0, 18.0, 20.0, 25.0, 36.0])
check(avg, [3.0, 4.0, 6.0, 5.0, 5.0, 6.0])
print
print 'add values [3, 5, 10] to the tail of the input stream.'
# Add values to the tail of stream x.
x.extend([3, 5, 10])
# Print the N most recent values of streams x, v, w.
x.print_recent()
v.print_recent()
avg.print_recent()
print
print 'add values [2, 5, 11] to the tail of the input stream.'
# Add more values to the tail of stream x.
x.extend([2, 5, 11])
# Print the N most recent values of streams x, v, w.
x.print_recent()
v.print_recent()
avg.print_recent()
check_empty()
