def ascii_plot(xs, ys, title=None, print_out=False):
    import subprocess
    import platform
    if platform.system().lower() == 'windows':
        path = 'C:/Program Files/gnuplot/bin/gnuplot.exe'
    else:
        path = "/usr/bin/gnuplot"
    gnuplot = subprocess.Popen([path], 
                               stdin=subprocess.PIPE, 
                               stdout=subprocess.PIPE,
                               universal_newlines=True)
    input_string = "set term dumb 90 25\n"
    input_string += "set key off\n"
 
    if not hasattr(ys[0], '__len__'):
        ys_list = [ys]
    else:
        ys_list = ys
 
    input_string += "plot " 
    input_string += ', '.join(["'-' using 1:2 title 'Line1' with linespoints" for ys in ys_list])
    input_string += '\n'
 
    for ys in ys_list:
        for i, j in zip(xs, ys):
            input_string += "%f %f\n" % (i, j)
        input_string += "e\n"
 
    output_string, error_msg = gnuplot.communicate(input_string)
 
    if title is not None:
        title = '** {} **\n'.format(title.title())
        output_string = title + output_string
 
    if print_out:
        print(output_string)
 
    return output_string
 
 
if __name__ == '__main__':
    from tqdm import tqdm
    from time import sleep
    for freq in tqdm(range(10)):
        import numpy as np
        xs = np.linspace(0, 2 * np.pi, 100)
        ys = np.sin(freq * xs)
        o = ascii_plot(xs, ys)
        tqdm.write(o)
        sleep(1)