code: def merge(a, b):
      """Merge two ranges with step == 1.
  
      Parameters
      ----------
      a : range
          The first range.
      b : range
          The second range.
      """
      _check_steps(a, b)
      return range(min(a.start, b.start), max(a.stop, b.stop))
  
file_path: zipline/zipline/utils/range.py
imports: import operator
  from six import PY2
  from toolz import peek
  from zipline.utils.functional import foldr
label_desc: Use image node_id 5 for calling a global function with example usage: merge(a, b) and returns: range