Howto Context manager

class WrapWithBokeh(object):
    def __init__(self):
        self.plot = figure()

    def __enter__(self):
        return self.plot

    def __exit__(self, exc_type, exc_val, exc_tb):
        output_file = output_file_name
        show(self.plot)

'''Python list'''
with WrapWithBokeh() as plot:
    x = [1, 2, 3, 4, 5]
    y = [3, 6, 4, 6, 8]
    plot.line(x, y, line_width=3)
    plot.circle(x, y, fill_color='white', size=10)