human
Can you show me a Python function to check if a column is null in the column.
assistant
Here is a Python function to check if a column is null in the column

import pandas as pd

def is_null(column):
    """Check if a column is null."""
    return column is None

# Enter the dataframe
df = pd.DataFrame({"col1": [1, 2, 3], "col2": [4, 5, 6]})

# Calling the function
print((is_null(df["col1"])))
print((is_null(df["col2"])))

#Example Output
# False
# False

#Remember to inspect code for bugs.