docstr: Return a single slice starting at the offset (or zero)
docstr_tok: ["Return","a","single","slice","starting","at","the","offset","(","or","zero",")"]
code: def single_slice_helper(self, offset, size):
      """Return a single slice starting at the offset (or zero)"""
      if offset < 0:
          offset = 0
      return slice(offset, offset + size)
  
imports: from io import StringIO
  import numpy
  from cellprofiler_core.constants.measurement import COLTYPE_INTEGER
  from cellprofiler_core.measurement import Measurements
  from cellprofiler_core.modules.align import Align, A_SIMILARLY, A_SEPARATELY, M_MUTUAL_INFORMATION, C_SAME_SIZE, C_CROP, C_PAD, M_CROSS_CORRELATION, MEASUREMENT_FORMAT, C_ALIGN
  from cellprofiler_core.object import ObjectSet
  from cellprofiler_core.pipeline import Pipeline, LoadException
  from cellprofiler_core.preferences import set_headless
  from cellprofiler_core.workspace import Workspace
  from tests.core.modules import read_example_image
  from cellprofiler_core.image import ImageSetList, Image
label_desc: Use image node_id 5 for calling the TestAlign obj's underlying member method code with example usage: obj.single_slice_helper(offset, size) and returns: slice