问将物料输出为emf，避免黑底填充

EN

import matplotlib.pyplot as plt
import subprocess, os

# Graph with 4 nodes - its coordinates
x = [0, 5, 5, 0]
y = [0, 0, 5, 5]

fig, ax = plt.subplots()

# Plot the vertices
for i in range(len(x)):
        ax.plot(x[i], y[i], 'ro',
                 markersize = 12,
                 fillstyle = 'none',
                 label = 'A')

# Plot the edges
plt.plot(x,y)

# Legend
handles, labels = plt.gca().get_legend_handles_labels()
by_label = dict(zip(labels, handles))
plt.legend(by_label.values(), by_label.keys())

# File export
inkscape_path = "C://Program Files//Inkscape//bin//inkscape.exe"
out_file = "C:/Users/banbar/Desktop/out1.emf"

path, filename = os.path.split(out_file)
filename, extension = os.path.splitext(filename)

svg_filepath = os.path.join(path, filename+'.svg')
emf_filepath = os.path.join(path, filename+'.emf')

fig.savefig(svg_filepath, format='svg')

subprocess.call([inkscape_path, svg_filepath, '--export-filename', emf_filepath])