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import matplotlib.pyplot as plt

import numpy as np

def plot_01():

  x1=np.array([152.6,310.6,463.6,625.9])

  y1=np.array([120.00,60.26,39.95,29.99])

  x2=np.array([156.2,332.8,501.6,678.0])

  y2=np.array([110.00,54.69,36.54,27.66])

  x3=np.array([177.9,371.0,558.2,753.3])

  y3=np.array([100.00,50.17,34.26,24.59])

  plot1,=plt.plot(x1,y1,'ro-')

  plot2,=plt.plot(x2,y2,'gs-')

  plot3,=plt.plot(x3,y3,'b*-')

  plt.title('relation between string length,wave length,and frequency')

  plt.xlabel('frequency')

  plt.ylabel('wave length')

plt.legend([plot1,plot2,plot3],['60cm','55cm','50cm'],loc="best")

   plt.show()

plot_01()