code: def make_day_night_masks(
      solarZenithAngle,
      good_mask,
      highAngleCutoff,
      lowAngleCutoff,
      stepsDegrees=None,
  ):
      """Generate masks for day, night, and twilight regions.
  
      Masks are created from the provided solar zenith angle data.
  
      Optionally provide the highAngleCutoff and lowAngleCutoff that define
      the limits of the terminator region (if no cutoffs are given the
      DEFAULT_HIGH_ANGLE and DEFAULT_LOW_ANGLE will be used).
  
      Optionally provide the stepsDegrees that define how many degrees each
      "mixed" mask in the terminator region should be (if no stepsDegrees is
      given, the whole terminator region will be one mask).
      """
      # if the caller passes None, we're only doing one step
      stepsDegrees = (
          highAngleCutoff - lowAngleCutoff
          if stepsDegrees is None
          else stepsDegrees
      )
  
      night_mask = (solarZenithAngle > highAngleCutoff) & good_mask
      day_mask = (solarZenithAngle <= lowAngleCutoff) & good_mask
      mixed_mask = []
      steps = list(
          range(lowAngleCutoff, highAngleCutoff + 1, stepsDegrees)
      )
      if steps[-1] >= highAngleCutoff:
          steps[-1] = highAngleCutoff
      steps = zip(steps, steps[1:])
      for i, j in steps:
          LOG.debug("Processing step %d to %d" % (i, j))
          tmp = (
              (solarZenithAngle > i)
              & (solarZenithAngle <= j)
              & good_mask
          )
          if tmp.any():
              LOG.debug("Adding step %d to %d" % (i, j))
              # log.debug("Points to process in this range: " + str(np.sum(tmp)))
              mixed_mask.append(tmp)
          del tmp
  
      return day_mask, mixed_mask, night_mask
  
imports: from __future__ import annotations
  import logging
  import math
  from datetime import datetime
  import dask
  import dask.array
  import numpy
  import xarray
  from satpy.composites import CompositeBase, GenericCompositor
  from satpy.dataset import combine_metadata
label_desc: Use image node_id 1 for calling a global function with example usage: make_day_night_masks(solarZenithAngle, good_mask, highAngleCutoff, lowAngleCutoff, stepsDegrees) and returns: day_mask,  mixed_mask,  night_mask