No Handles With Labels Found To Put In Legend

I'm trying to create a parallelogram in PyPlot. I'm not up to drawing the parallelogram--first I'm putting in the vector arrows--using the following code: fig = plt.figure() ax = f

Solution 1:

It might be late but for anyone with the same issue the solution is using the method legend() for the corresponding ax not as for plt

fig = plt.figure()
ax = fig.add_subplot(111)
ax.spines['left'].set_position('zero')
ax.spines['right'].set_color('none')
ax.spines['bottom'].set_position('zero')
ax.spines['top'].set_color('none')
plt.axis([-5,5,-5,5])
ax.xaxis.set_ticks_position('bottom')
ax.yaxis.set_ticks_position('left')
plt.grid()
plt.arrow(0,0, 3,1, head_width=0.2, color='r', length_includes_head=True, label='u')
plt.arrow(0,0, 1,3, head_width=0.2, color='r', length_includes_head=True, label='v')
plt.arrow(0,0, 4,4, head_width=0.2, color='r', length_includes_head=True, label='u+v')
ax.legend()

Solution 2:

You can explicitly define the elements in the legend.

For full control of which artists have a legend entry, it is possible to pass an iterable of legend artists followed by an iterable of legend labels respectively. Reference

Example:

arr1 = plt.arrow(0,0, 3,1, head_width=0.2, color='r', length_includes_head=True)
arr2 = plt.arrow(0,0, 1,3, head_width=0.2, color='g', length_includes_head=True)
arr3 = plt.arrow(0,0, 4,4, head_width=0.2, color='b', length_includes_head=True)

plt.xlim(0,5)
plt.ylim(0,5)

plt.legend([arr1, arr2, arr3], ['u','v','u+v'])

Solution 3:

The error is thrown because you haven't specified the label text

Either do something like this

plt.hist([x01, x02,x03], color=["lightcoral","lightskyblue","slategrey"], stacked=True, 
             label=['Supressed','Active','Resolved'])
plt.legend()

Or

Do not use plt.legend() if you haven't specified the label text as in the following WRONG example:

plt.hist([x01])
plt.legend()

The above will throw the same error, so either remove legend function or provide what it needs -> label. Side note: Here x01 is just a list of number for which I am creating a histogram, in the first example they are three list of numbers to create stacked bar chart

The bottom line is this error is thrown because of not specifying legend text and calling/initializing a legend

Solution 4:

I had this error when using labels which started with an underscore

plt.plot(x, y, label = '_bad_name')

Removing the front underscore from the labels solved the issue

Solution 5:

I face similar problem like No handles with labels found to put in legend.

First My code look like

figure, axis = pyplot.subplots(nrows=1,ncols=2, figsize=(15, 6), tight_layout=True)

axis[0].legend(title='Country', title_fontsize = 12) #this line
axis[0].pie(x=piechart_result['value_eur'],labels=piechart_result['short_name'])

axis[1].pie(x=piechart_result['value_eur'],labels=piechart_result['short_name')

pyplot.show()

Then I changed to

figure, axis = pyplot.subplots(nrows=1,ncols=2, figsize=(15, 6), tight_layout=True)

axis[0].pie(x=piechart_result['value_eur'],labels=piechart_result['short_name'])
axis[0].legend(title='Country', title_fontsize = 12) # this line

axis[1].pie(x=piechart_result['value_eur'],labels=piechart_result['short_name')

pyplot.show()

this work for me in colab notebook