Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. The Axes Class contains most of the figure elements: Axis, Tick, Line2D, Text, Polygon, etc., and sets the coordinate system. And the instances of Axes supports callbacks through a callbacks attribute.
matplotlib.axes.Axes.get_legend() Function
The Axes.get_legend() function in axes module of matplotlib library is used to return the Legend instance, or None if no legend is defined.
Syntax: Axes.get_legend(self)
Parameters: This method does not accepts any parameters.
Return: This function return the Legend instance, or None if no legend is defined.
Below examples illustrate the matplotlib.axes.Axes.get_legend() function in matplotlib.axes:
Example 1:
# Implementation of matplotlib function import matplotlib.pyplot as plt
import numpy as np
fig, ax = plt.subplots()
ax.plot([ 1 , 6 , 3 , 8 , 34 , 13 , 56 , 67 ], color = "green" )
x = ax.get_legend()
text = "Legend is present"
if x = = None :
text = "No legend present"
ax.text( 2.5 , 60 , text, fontweight = "bold" )
fig.suptitle('matplotlib.axes.Axes.get_legend() function\ Example\n', fontweight = "bold" )
fig.canvas.draw() plt.show() |
Output:
Example 2:
# Implementation of matplotlib function import matplotlib.pyplot as plt
fig, (ax, ax1) = plt.subplots( 1 , 2 )
# axes1 line1, = ax.plot([ 1 , 2 , 3 ], label = "Line 1" ,
color = "black" , linewidth = 4 ,
linestyle = ':' )
line2, = ax.plot([ 3 , 2 , 1 ], label = "Line 2" ,
color = "green" ,
linewidth = 4 )
first_legend = ax.legend(handles = [line1],
loc = 'upper center' )
ax.add_artist(first_legend) ax.legend(handles = [line2], loc = 'lower center' )
ax.set_title( "Without get_legend function" )
# axes1 line1, = ax1.plot([ 1 , 2 , 3 ], label = "Line 1" ,
color = "black" , linewidth = 4 ,
linestyle = ':' )
line2, = ax1.plot([ 3 , 2 , 1 ], label = "Line 2" ,
color = "green" ,
linewidth = 4 )
first_legend = ax1.legend(handles = [line1],
loc = 'upper center' )
ax1.add_artist(first_legend) ax1.legend(handles = [line2],
loc = 'lower center' )
ax1.get_legend().set_visible( False )
ax1.set_title( "Using get_legend function" )
fig.suptitle('matplotlib.axes.Axes.get_legend()\ function Example\n', fontweight = "bold" )
plt.show() |
Output: