code: def test_atan_expr():
      expr = ast.AtanExpr(ast.NumVal(2.0))
  
      expected_code = """
  import math
  def score(input):
      return math.atan(2.0)
  """
  
      interpreter = PythonInterpreter()
      assert_code_equal(interpreter.interpret(expr), expected_code)
  
imports: from itertools import product
  import pytest
  from m2cgen import ast
  from m2cgen.interpreters import PythonInterpreter
  from tests.utils import assert_code_equal
label_desc: Use image node_id 23 for calling a global function with example usage: test_atan_expr() without return types