如何将 Seaborn FacetGrid 中的图例移出情节

How to move the legend in Seaborn FacetGrid outside of the plot

我有以下代码:

g = sns.FacetGrid(df, row="Type", hue="Name", size=3, aspect=3)
g = g.map(sns.plt.plot, "Volume", "Index")
g.add_legend()
sns.plt.show()

结果如下图:

如何将图例移出情节?

您可以通过调整图的大小来做到这一点:

g = sns.FacetGrid(df, row="Type", hue="Name", size=3, aspect=3)
g = g.map(sns.plt.plot, "Volume", "Index")
for ax in g.axes.flat:
    box = ax.get_position()
    ax.set_position([box.x0,box.y0,box.width*0.9,box.height])

sns.plt.legend(loc='center left',bbox_to_anchor=(1,0.5))
sns.plt.show()

示例:

import seaborn as sns

tips = sns.load_dataset('tips')

# more informative values
condition = tips['smoker'] == 'Yes'
tips['smoking_status'] = ''
tips.loc[condition,'smoking_status'] = 'Smoker'
tips.loc[~condition,'smoking_status'] = 'Non-Smoker'

g = sns.FacetGrid(tips,row='sex',hue='smoking_status',size=3,aspect=3)
g = g.map(plt.scatter,'total_bill','tip')
for ax in g.axes.flat:
    box = ax.get_position()
    ax.set_position([box.x0,box.y0,box.width*0.85,box.height])

sns.plt.legend(loc='upper left',bbox_to_anchor=(1,0.5))
sns.plt.show()

结果:

根据上面 mwaskom 的评论,这是 OS X 中的一个错误。确实切换到另一个后端解决了这个问题。

例如,我将其放入 matplotlibrc:

backend : TkAgg   # use Tk with antigrain (agg) rendering

按照 Seaborn 文档,您可以将 arg legend_out=True 添加到您的调用中,这应该可以解决问题

https://seaborn.pydata.org/generated/seaborn.FacetGrid.html

你的代码看起来像

g = sns.FacetGrid(df, row="Type", hue="Name", size=3, aspect=3, legend_out=True)
g = (g.map(plt.plot, "Volume", "Index").add_legend())
plt.show()