<human>:  What is a good Python code to check if the value is null or a list of values.
<bot>:)
  True
  >>> is_null_or_list('a')
  False
  """
  if isinstance(value, list):
    return True
  return False

# Enter the value
value = "a"

# Calling the function
print((is_null_or_list(value)))

#Example Output
# False

#Remember to inspect code for bugs.