In [1]: mask = ["x", "x", "x", "x", "", "", ""]

In [2]: cal = np.busdaycalendar(weekmask=mask)

In [3]: cal.weekmask
Out[3]: array([ True,  True,  True,  True, False, False, False])

In [13]: np.__version__
Out[13]: '2.4.2'

In [14]: mask = ["x", "x", "x", "x", "", "", ""]

In [15]: cal = np.busdaycalendar(weekmask=mask)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[15], line 1
----> 1 cal = np.busdaycalendar(weekmask=mask)

TypeError: 'str' object cannot be interpreted as an integer