code: def is_busday(
      dates, weekmask=None, holidays=None, busdaycal=None, out=None
  ):
      """
      is_busday(dates, weekmask='1111100', holidays=None, busdaycal=None, out=None)
  
      Calculates which of the given dates are valid days, and which are not.
  
      .. versionadded:: 1.7.0
  
      Parameters
      ----------
      dates : array_like of datetime64[D]
          The array of dates to process.
      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 bool, optional
          If provided, this array is filled with the result.
  
      Returns
      -------
      out : array 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
      --------
      >>> # 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])
      """
      return (dates, weekmask, holidays, out)
  
imports: import functools
  from .None import overrides
  from .None import _multiarray_umath
  from ._multiarray_umath import *
  from ._multiarray_umath import fastCopyAndTranspose, _flagdict, from_dlpack, _place, _reconstruct, _vec_string, _ARRAY_API, _monotonicity, _get_ndarray_c_version, _get_madvise_hugepage, _set_madvise_hugepage, _get_promotion_state, _set_promotion_state, _using_numpy2_behavior
label_desc: Use image node_id 20 for calling a global function with example usage: is_busday(dates, weekmask, holidays, busdaycal, out) and returns: dates,  weekmask,  holidays,  out