input: Write a function to evaluate a given string containing a numerical expression and return the result. The function should take a single string argument and use the `eval()` function to compute the result.
  
  assert eval_expr("3 + 4 * 5")==23
  assert eval_expr("10 / 2 - 3")==2
  assert eval_expr("2 ** 3")==8
  assert eval_expr("(1 + 2) * 3")==9
  assert eval_expr("10 % 3")==1
output: def eval_expr(expression):
      return eval(expression)