海运图案中移动图例外部图形

20220916 Update

Since version v0.11.2 of seaborn, there is an in-built control of the legend position, see seaborn.move_legend. To put the legend outside:

ax = sns.histplot(penguins, x="bill_length_mm", hue="species")
sns.move_legend(ax, "upper left", bbox_to_anchor=(1, 1))

Old Answer

Indeed, seaborn doesn't handle legends well so far. You can use plt.legend() to control legend properties directly through matplotlib, in accordance with Matplotlib Legend Guide.

Note that in Seaborn 0.10.0 tsplot was removed, and you may replicate (with different values for the estimation if you please) the plots with lineplot instead of tsplot.

Snippet

import matplotlib.pyplot as plt
import seaborn as sns


sns.set(style="darkgrid")


# Load the long-form example gammas dataset
gammas = sns.load_dataset("gammas")


# Plot the response with standard error
sns.lineplot(data=gammas, x="timepoint", y="BOLD signal", hue="ROI")


# Put the legend out of the figure
plt.legend(bbox_to_anchor=(1.05, 1), loc=2, borderaxespad=0.)

Output

The answer by Sergey worked great for me using a seaborn.tsplot but I was not able to get it working for an seaborn.lmplot so I looked a bit deeper and found another solution:

Example:

import seaborn as sns
import pandas as pd


# load data
df = pd.DataFrame.from_csv('mydata.csv')


# create with hue but without legend
g = sns.lmplot(x="x_data", y="y_data", hue="condition", legend=False, data=df)


# resize figure box to -> put the legend out of the figure
box = g.ax.get_position() # get position of figure
g.ax.set_position([box.x0, box.y0, box.width * 0.85, box.height]) # resize position


# Put a legend to the right side
g.ax.legend(loc='center right', bbox_to_anchor=(1.25, 0.5), ncol=1)


sns.plt.show(g)

Maybe you have to play around with the values to fit them to your legend. This answer will also be helpful if you need more examples.

I tried to apply T.W.'s answer for seaborn lineplot, without success. A few modifications to his answer did the job... in case anyone is looking for the lineplot version as I was!

import seaborn as sns
import pandas as pd


# load data
df = sns.load_dataset("gammas")


# EDIT: I Needed to ad the fig
fig, ax1 = plt.subplots(1,1)


# EDIT:
# T.W.' answer said: "create with hue but without legend" <- # I needed to include it!
# So, removed: legend=False
g = sns.lineplot(x="timepoint", y="BOLD signal", hue="ROI", data=df, ax=ax1)


# EDIT:
# Removed 'ax' from T.W.'s answer here aswell:
box = g.get_position()
g.set_position([box.x0, box.y0, box.width * 0.85, box.height]) # resize position


# Put a legend to the right side
g.legend(loc='center right', bbox_to_anchor=(1.25, 0.5), ncol=1)


plt.show()

A pure seaborn solution:

FacetGrid-based Seaborn plots can do this automatically using the legend_out kwarg. Using relplot, pass legend_out to the FacetGrid constructor via the facet_kws dictionary:

import seaborn as sns


sns.set(style="darkgrid")


gammas = sns.load_dataset("gammas")


sns.relplot(
data=gammas,
x="timepoint",
y="BOLD signal",
hue="ROI",
kind="line",
facet_kws={"legend_out": True}
)

Existing solutions seem to be making things unnecessarily complicated by using the "wrong" thing for the location parameter; think about it terms of where the legend is in relation to an anchor. For example, if you want a legend on the right, then the anchor location is center left of it.

We can simplify Sergey Antopolskiy's answer down to:

import seaborn as sns


# Load the long-form example gammas dataset
g = sns.lineplot(data=gammas, x="timepoint", y="BOLD signal", hue="ROI")


# Put the legend out of the figure
g.legend(loc='center left', bbox_to_anchor=(1, 0.5))

bbox_to_anchor says we want the anchor on the right (i.e. 1 on the x-axis) and vertically centered (0.5 on the y-axis). loc says we want the legend center-left of this anchor.

In Seaborn version 0.11.0, this gives me something like: