How to get evenly-spaced datetime tick labels regardless of x-values of data points?

[Mark17]

see: https://matplotlib.org/3.1.1/gallery/tic..._demo.html

How do you suggest I implement that?

I had previously worked successfully with this Class and np.linspace() as the first argument.

This does not work:

import matplotlib

a = ['2017-01-06', '2017-01-13', '2017-01-20', '2017-01-27', '2017-02-03', '2017-02-10', '2017-02-17', \
     '2017-02-24', '2017-03-03', '2017-03-10', '2017-03-17', '2017-03-24', '2017-03-31', '2017-04-07', \
     '2017-04-14', '2017-04-21', '2017-04-28', '2017-05-05', '2017-05-12', '2017-05-19']
b = [433, 1216, 1234, 2175, 2825, 3271, 3240, 2979, 2234, 3114, 3139, 2975, 3831, 3758, 4127, 4900, 4216,\
     4785, 4043, 4346]
fig, ax = plt.subplots(1) 

ax.plot(a,b)
ax.xaxis.set_major_locator(matplotlib.ticker.FixedLocator(list(pd.date_range('2010-01-01', '2011-12-31',5))))
plt.xticks(rotation=90) 
plt.show()

With or without that list() constructor, I get TypeError: type Timestamp doesn't define __round__ method