import matplotlib.pyplot as plt

def main():
    left_edges  = [0, 10, 20, 30, 40]
    heights = [100, 200, 300, 400, 500]

    bar_width = 5
    plt.bar(left_edges, heights, bar_width, color=('r', 'g', 'b', 'w', 'k' ) )
    plt.show()

if __name__ == '__main__':
    main()
