用matplotlib写数学公式

import matplotlib.pyplot as plt

fig, ax = plt.subplots(dpi=300)

ax.axis('off')

plt.tight_layout(pad=0)

formula = r'$e^{i\pi}+\sqrt{\sin(\frac{\pi}{2})}=0$'

text_obj = ax.text(0, 0, formula, fontsize=20, ha='left', va='bottom')

bbox = text_obj.get_window_extent()

fig.set_size_inches(bbox.width/fig.dpi, bbox.height/fig.dpi)

plt.show()