使用matplotlib将空白灰色方块的“图”打印为PDF

import matplotlib.pyplot as plt
from matplotlib.backends.backend_pdf import PdfPages

fig, ax = plt.subplots()
ax.set_facecolor('gray')

fig.set_size_inches(5, 5)  # 设置图形大小为5x5英寸
plt.margins(0)  # 设置边距为0

ax.axis('off')

with PdfPages('blank_square.pdf') as pdf:
    pdf.savefig(fig)

import matplotlib.pyplot as plt
from matplotlib.backends.backend_pdf import PdfPages

fig, ax = plt.subplots()
ax.set_facecolor('gray')
fig.set_size_inches(5, 5)
plt.margins(0)
ax.axis('off')

with PdfPages('blank_square.pdf') as pdf:
    pdf.savefig(fig)