matplotlib 设置坐标轴位置（spines）,设置坐标别名（xticks,yticks）

参考的这

import numpy as npimport matplotlib.pyplot as pltplt.rcParams['font.sans-serif']='SimHei'plt.figure(figsize=(8,5), dpi=80)plt.subplot(111)X = np.linspace(-np.pi, np.pi, 256,endpoint=True)C = np.cos(X)S = np.sin(X)plt.plot(X, C, color="blue", linewidth=2.5, linestyle="-")plt.plot(X, S, color="red", linewidth=2.5, linestyle="-")ax = plt.gca()ax.spines['right'].set_color('none')ax.spines['top'].set_color('none')ax.xaxis.set_ticks_position('bottom')ax.spines['bottom'].set_position(('data',0))ax.yaxis.set_ticks_position('left')ax.spines['left'].set_position(('data',0))plt.xlim(X.min() * 1.1, X.max() * 1.1)plt.xticks([-np.pi, -np.pi/2, 0, np.pi/2, np.pi],  [r'$-\pi$', r'$-\pi/2$', r'$0$', r'$+\pi/2$', r'$+\pi$'])'''确定坐标范围plt.axis([xmin, xmax, ymin, ymax])axis()命令给定了坐标范围。xlim(xmin, xmax)和ylim(ymin, ymax)来调整x,y坐标范围'''plt.ylim(C.min() * 1.1, C.max() * 1.1)plt.yticks([-1, 0, +1],  [r'bottom', r'normal', r'top'])plt.annotate('local max',xy=(0,1),xytext=(1.2,1.2),             arrowprops=dict(facecolor='red',shrink=0.04))plt.xlabel('X轴',fontsize=12,color='red',rotation=60,verticalalignment='top')plt.ylabel('y轴',fontsize=14,color='blue',rotation=30,horizontalalignment='center')plt.text(-2,0.5,r'数学sin函数',rotation=30)plt.savefig('spine.png')# plt.show()