Trouble with matplotlib after installing ggplot

Question

Yesterday, I installed the ggplot to my anaconda environment. When I tried to use the matplotlib plot that worked before I installed ggplot I am getting the below error. I am also getting errors from other inline jupyter lab codes. Any help will be appreciated. I am new to visulizing data. If there is a another plotting module I should use let me know.

plt.rcParams['figure.dpi'] = 200
plt.rcParams.update({'font.size': 5})

fig, ax1 = plt.subplots()
ax1.set_xlabel('Time')

ax1.set_ylabel('price', color='k')
ax1.plot(df['price'], color='#0072b5', label = 'price')
ax1.tick_params(axis='y', labelcolor='k')
#ax1.tick_params(axis='x',  labelrotation = 90) 

ax2 = ax1.twinx()  # instantiate a second axes that shares the same x-axis#

color = 'tab:cyan'
ax2.set_ylabel('gen', color='k')  # we already handled the x-label with ax1
ax2.plot(df['gen'], color='#e2e3e2', label = 'gen')
ax2.tick_params(axis='y', labelcolor='k')

#ax1.legend(loc=2)
#ax2.legend(loc=1)
fig.legend(loc=1, bbox_to_anchor=(1,1), bbox_transform=ax1.transAxes, prop={'size':5})


fig.tight_layout()  # otherwise the right y-label is slightly clipped
fig.suptitle('%s, %s %s' % (df, month_graph, year_graph) , fontsize=8)
fig.subplots_adjust(top=0.90)
plt.savefig("%s.png" % ('genPrice'))
plt.show()

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-14-032d973b53a3> in <module>()
     19 #ax1.legend(loc=2)
     20 #ax2.legend(loc=1)
---> 21 fig.legend(loc=1, bbox_to_anchor=(1,1), bbox_transform=ax1.transAxes, prop={'size':5})
     22 
     23 

TypeError: legend() missing 2 required positional arguments: 'handles' and 'labels'

Answer 1

The traceback states that two "required" arguments are missing although, accordingly to the documentation, they are in fact optional. If you are experiencing this issue since installing a new module, then maybe you have downgraded matplotlib to a previous version where the two arguments were obligatory. If this is the case, you may want to pip install matplotlib --upgrade from the console.

Answer 2

The signature for matplotlib.figure.Figure.legend is in version 2.0.2 of matplotlib

legend(handles, labels, *args, **kwargs)

while in version 2.1.2 or above it is

legend(*args, **kwargs)

This means you have downgraded your matplotlib during the install of ggplot. If you want to continue working with this older matplotlib version you would need to provide the handles and labels yourself. This could look like

h1, l1 = ax1.get_legend_handles_labels()
h2, l2 = ax2.get_legend_handles_labels()

fig.legend(h1+h2, l1+l2, loc=1, bbox_to_anchor=(1,1), 
           bbox_transform=ax1.transAxes, prop={'size':5})