我正在寻找一种使用 matplotlib 进行无缝地图图像绘制的解决方案。当前的代码运行良好且稳定，但是，它在左侧和底部留下了空白。我想删除这个空白，但不知道如何。
我的示例代码：
import geopandas
from seaborn import despine
from pandas import read_csv
import matplotlib.pyplot as plt
# read data and shapefile
geo_path = 'shapefiles/ne_10m_admin_0_countries.shp'
df = read_csv('UNpopEstimates2100.csv')
world = geopandas.read_file(geo_path)
# specifiy what is to be plotted
cm = 'Greys'
world['2015'] = df['2015']
# set plot environment
fig = plt.figure()
ax = fig.add_axes([0, 0, 1, 1])
ax.axis('off')
plt.subplots_adjust(left=0, right=1, bottom=0, top=1)
world.plot(ax=ax, column='2015', cmap=cm, scheme='quantiles')
plt.savefig('sample.png', bbox_inches='tight', tight_layout=True, pad_inches=0, frameon=None)
