Set the ticks position.
'both' sets the ticks to appear on both positions, but does not change the tick labels. 'default' resets the tick positions to the default: ticks on both positions, labels at bottom. 'none' can be used if you don't want any ticks. 'none' and 'both' affect only the ticks, not the labels.
matplotlib.axis.XAxis.set_ticks_position
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https://matplotlib.org/3.5.1/api/_as_gen/matplotlib.axis.XAxis.set_ticks_position.html