code: def square_matrix(w, cell_value=None):
      row = [cell_value] * w if cell_value is not None else range(0, w)
      return H2OFrame(python_obj=[list(row) for i in range(0, w)])
  
file_path: h2o-3/h2o-py/tests/testdir_misc/pyunit_expr_optimizations.py
imports: import h2o
  import sys
  from tests import pyunit_utils
  from h2o import H2OFrame
  from h2o.expr import ExprNode
label_desc: Use image node_id 12 for calling a global function with example usage: square_matrix(w, cell_value) and returns: H2OFrame