matplotlib教程：编辑数学公式

import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(111)

ax.set_xlim(1, 7)
ax.set_ylim(1, 5)

ax.text(2, 4, r'$ \alpha_i \beta_j \pi \lambda \omega $', size=25)
ax.text(4, 4, r'$ \sin(0)=\cos(\frac{\pi}{2}) $', size=25)
ax.text(2, 2, r'$ \lim_{x \rightarrow y} \frac{1}{x^3} $', size=25)
ax.text(4, 2, r'$ \sqrt[4]{x}=\sqrt{y} $', size=25)

fig.show()