余分な軸を含まない PNG 画像として Pandas DataFrame を保存するにはどうすればよいですか?

<code class="python">import matplotlib.pyplot as plt
import pandas as pd

# Prepare Matplotlib
ax = plt.subplot(111, frame_on=False)  # Remove frame
ax.xaxis.set_visible(False)  # Hide x-axis
ax.yaxis.set_visible(False)  # Hide y-axis

# Plot DataFrame as table
table(ax, df)

# Save as PNG
plt.savefig('mytable.png')</code>

<code class="python"># Example DataFrame with multi-index
df = pd.DataFrame({'first': ['bar', 'bar', 'baz', 'baz', 'foo', 'foo', 'qux', 'qux'],
                   'second': ['one', 'two', 'one', 'two', 'one', 'two', 'one', 'two'],
                   '0': [1.991802, 0.403415, -1.024986, -0.522366, 0.350297, -0.444106, -0.472536, 0.999393]})

# Simulate multi-index
df = df.reset_index()
df[df.duplicated('first')] = ''
new_cols = df.columns.values
new_cols[:2] = '', ''
df.columns = new_cols

# Create table without row labels
ax = plt.subplot(111, frame_on=False)  # Remove frame
ax.xaxis.set_visible(False)  # Hide x-axis
ax.yaxis.set_visible(False)  # Hide y-axis
table(ax, df, rowLabels=['']*df.shape[0], loc='center')

# Save as PNG
plt.savefig('mymultitable.png')</code>