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numpy.is_busday — NumPy v2.3 Manual

numpy.is_busday(dates, weekmask='1111100', holidays=None, busdaycal=None, out=None)#

Calculates which of the given dates are valid days, and which are not.

Parameters:

datesarray_like of datetime64[D]

The array of dates to process.

weekmaskstr or array_like of bool, optional

A seven-element array indicating which of Monday through Sunday are valid days. May be specified as a length-seven list or array, like [1,1,1,1,1,0,0]; a length-seven string, like ‘1111100’; or a string like “Mon Tue Wed Thu Fri”, made up of 3-character abbreviations for weekdays, optionally separated by white space. Valid abbreviations are: Mon Tue Wed Thu Fri Sat Sun

holidaysarray_like of datetime64[D], optional

An array of dates to consider as invalid dates. They may be specified in any order, and NaT (not-a-time) dates are ignored. This list is saved in a normalized form that is suited for fast calculations of valid days.

busdaycalbusdaycalendar, optional

A busdaycalendar object which specifies the valid days. If this parameter is provided, neither weekmask nor holidays may be provided.

outarray of bool, optional

If provided, this array is filled with the result.

Returns:

outarray of bool

An array with the same shape as dates, containing True for each valid day, and False for each invalid day.

See also

busdaycalendar

An object that specifies a custom set of valid days.

busday_offset

Applies an offset counted in valid days.

busday_count

Counts how many valid days are in a half-open date range.

Examples

>>> import numpy as np
>>> # The weekdays are Friday, Saturday, and Monday
... np.is_busday(['2011-07-01', '2011-07-02', '2011-07-18'],
...                 holidays=['2011-07-01', '2011-07-04', '2011-07-17'])
array([False, False,  True])

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