Hiding major tick labels while showing minor tick labels in matplotlib

I would like to hide the major tick labels on my x-axis while retaining just its minor labels. The idea is that my dates are displayed in between the major ticks instead of on them by default. I have seen a few other answers to similar questions as this one and tried using their way of hiding the major ticks however I am not having much luck getting it working at all. My graph currently looks like this:

Major and minor ticks for November

This is the formatting code I originally had for my graph before I decided I wanted to put the labels on the minor ticks.

day_fmt = '%d'   
myFmt = mdates.DateFormatter(day_fmt)  
ax.xaxis.set_major_formatter(myFmt)   
ax.xaxis.set_major_locator(matplotlib.dates.DayLocator(interval=1))     

I have attempted to get the minor ticks to show up while hiding major ticks using the code below. Here I’ve used an hour locator at 12pm to get the middle point of a day:

import matplotlib.ticker
ax.xaxis.set_major_formatter(ticker.NullFormatter()) #Clear major tick labels   
ax.xaxis.set_minor_formatter(myFmt)
ax.xaxis.set_minor_locator(matplotlib.dates.HourLocator(interval=12)) 

But for some reason I get graphs that look like the picture above – with both major and minor x-axis tick labels. I also tried clearing unwanted ticks using ax.set_xticks([]). Has anyone had similar issues and fixed this or know a way to overcome this?

Best answer

You could try

import matplotlib.pyplot as plt

...
plotting nitty gritty
...

plt.setp(ax.get_xmajorticklabels(), visible=False)
plt.show()