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# numpy.busday_count

`numpy.``busday_count`(begindates, enddates, weekmask='1111100', holidays=[], busdaycal=None, out=None)

  Counts the number of valid days between begindates and enddates, not including the day of enddates.

  If `enddates` specifies a date value that is earlier than the corresponding `begindates` date value, the count will be negative.

  New in version 1.7.0.

  Parameters : | begindates : array_like of datetime64[D] The array of the first dates for counting. enddates : array_like of datetime64[D] The array of the end dates for counting, which are excluded from the count themselves. weekmask : str 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 holidays : array_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. busdaycal : busdaycalendar, optional A `busdaycalendar` object which specifies the valid days. If this parameter is provided, neither weekmask nor holidays may be provided. out : array of int, optional If provided, this array is filled with the result.
  Returns : | out : array of int An array with a shape from broadcasting `begindates` and `enddates` together, containing the number of valid days between the begin and end dates.

  See also

  `busdaycalendar`
    An object that specifies a custom set of valid days.
  `is_busday`
    Returns a boolean array indicating valid days.
  `busday_offset`
    Applies an offset counted in valid days.

  Examples

      >>> # Number of weekdays in January 2011
      ... np.busday_count('2011-01', '2011-02')
      21
      >>> # Number of weekdays in 2011
      ...  np.busday_count('2011', '2012')
      260
      >>> # Number of Saturdays in 2011
      ... np.busday_count('2011', '2012', weekmask='Sat')
      53

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