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Process finished with exit code -1073741819 (0xC0000005)

#encoding=utf-8

import numpy as np
def main():

    import matplotlib.pyplot as plt
    x=np.linspace(-np.pi,np.pi,256,endpoint=True)
    c,s=np.cos(x),np.sin(x)
    plt.figure(1)
    plt.plot(x,c)
    plt.plot(x,s)
    plt.show()

if __name__ == '__main__':
    main()