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matplotlib

PyPlot example


import matplotlib.pyplot as plt
import numpy as np

# generate data
x=np.linspace(-1,1,100) # 100 points between -1 and 1;
y=x*x

# plot data
plt.plot(x,y)
plt.legend(['x^2'])
plt.xlabel('x')
plt.ylabel('y')
plt.axis([-1.2, 1.2, 0, 1.2])
plt.title('Squared curve')

plt.show()  # show in window

plt.savefig('fig_example.pdf') # save to file
plt.close()








http://matplotlib.org/faq/howto_faq.html
https://en.wikipedia.org/wiki/Matplotlib