human
What is a good Python code to check if the value is null or a list of values.
assistant
Here is a Python code to check if the value is null or a list of values

import numpy as np

def is_null_or_list(value):
    """
    >>> is_null_or_list(None)
    True
    >>> is_null_or_list([])
    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.