code: def test_exp_fallback_expr():
      expr = ast.ExpExpr(ast.NumVal(2.0))
  
      interpreter = PythonInterpreter()
      interpreter.exponent_function_name = NotImplemented
  
      expected_code = """
  import math
  def score(input):
      return math.pow(2.718281828459045, 2.0)
  """
  
      assert_code_equal(interpreter.interpret(expr), expected_code)
  
file_path: m2cgen/tests/test_fallback_expressions.py
imports: import pytest
  from m2cgen import ast
  from m2cgen.interpreters import CInterpreter, PythonInterpreter
  from tests.utils import assert_code_equal
label_desc: Use image node_id 5 for calling a global function with example usage: test_exp_fallback_expr() without return types