matplotlib库中gca、annotate应用

import numpy as np import matplotlib.pyplot as plt xnum = [-2*np.pi,-np.pi,0,np.pi,2*np.pi] xlabel = [r'$-2\pi$',r'$-\pi$',r'$0$',r'$\pi$',r'$2\pi$'] ynum = [-1,0,1,2,3] ylabel = [r'$-1$',r'$0$',r'$1$

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