code: def check_p_equals_zero(text):
      
      err = "psychology.p_equals_zero"
      msg = "Unless p really equals zero, you should use more decimal places."
  
      list = [
          "p = 0.00",
          "p = 0.000",
          "p = 0.0000",
      ]
  
      return existence_check(text, list, err, msg, join=True)
docs: Check for p = 0.000.