Bug report

Bug summary

Using matplotlib 3.4.1 on a fresh miniconda installation, trying to add a grid to an axis can return an error.
It seems to be linked with the "reset" option of the tick_param function of an axis, if the function has been used just before adding the grid. Activating the option seems to cause the issue; removing the option makes everything work.

Code for reproduction

fig,axes=plt.subplots(1,4,sharey=True)# This doesn't workforaxisinaxes:axis.tick_params(reset=True,axis='both',which='major',labelsize=10,right=False,top=False)foraxisinaxes:axis.grid(color="gainsboro",linestyle='-',linewidth=0.5)axis.set_facecolor('#FCFCFC')# This worksforaxisinaxes:axis.tick_params(reset=False,axis='both',which='major',labelsize=10,right=False,top=False)foraxisinaxes:axis.grid(color="gainsboro",linestyle='-',linewidth=0.5)axis.set_facecolor('#FCFCFC')

Actual outcome

File"C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\axis.py",line1414,ingridgridkw['gridOn']=notself._major_tick_kw['gridOn']KeyError:'gridOn'

Expected outcome

The grid is expected to be added to the figure without any issue, resulting in the following appearance :

Matplotlib version

• Operating system: Windows 10
• Matplotlib version (import matplotlib; print(matplotlib.__version__)): 3.4.1
• Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg
• Python version: 3.9.1

Matplotlib was installed via the anaconda command prompt, usingconda install -c conda-forge matplotlib.