是否可以设置更高的轴标签 z 索引？

在以下代码中，轴的标签隐藏在图形线后面：

import numpy as np
import matplotlib.pyplot as plt

X = np.linspace(-np.pi, np.pi, 256, endpoint=True)
C,S = np.cos(X), np.sin(X)

plt.plot(X,C)
plt.plot(X,S)

plt.xticks([-np.pi, -np.pi/2, 0, np.pi/2, np.pi],
           [r'$-\pi$', r'$-\pi/2$', r'$0$', r'$+\pi/2$', r'$+\pi$'])

plt.yticks([-1, 0, +1],
           [r'$-1$', r'$0$', r'$+1$'])

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))

for label in ax.get_xticklabels() + ax.get_yticklabels():
    label.set_fontsize(14)
    label.set_bbox(dict(facecolor='white', edgecolor='None', alpha=0.75 ))

plt.show()

例如你可以看到-pi很难看到。有没有办法将轴标签放在前面？

虽然欧内斯特的回答非常有帮助，我发现rcParams界面有点笨拙。幸运的是，您可以设置axisbelow选项直接在轴上set_axisbelow() method。这是代码的修补版本。

import numpy as np
import matplotlib.pyplot as plt

X = np.linspace(-np.pi, np.pi, 256, endpoint=True)
C,S = np.cos(X), np.sin(X)

plt.plot(X,C)
plt.plot(X,S)

plt.xticks([-np.pi, -np.pi/2, 0, np.pi/2, np.pi],
           [r'$-\pi$', r'$-\pi/2$', r'$0$', r'$+\pi/2$', r'$+\pi$'])

plt.yticks([-1, 0, +1],
           [r'$-1$', r'$0$', r'$+1$'])

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))

ax.set_axisbelow(False)  # <-- added

for label in ax.get_xticklabels() + ax.get_yticklabels():
    label.set_fontsize(14)
    label.set_bbox(dict(facecolor='white', edgecolor='None', alpha=0.75 ))

plt.show()

现在情节看起来像Nicolas P. Rougier 的教程说它应该：