Human: check if column values are blank in. Assistant: 
Here is a Python function to check if column values are blank

import pandas as pd

def check_if_column_values_are_blank(column_name):
        """
        Check if column values are blank.
        """
        if column_name in df.columns:
            if df[column_name].isnull().sum() > 0:
                return True
        return False

# Enter the data
df = pd.DataFrame({'a': [1, 2, 3, 4], 'b': [1, 2, 3, 4], 'c': [1, 2, 3, 4], 'd': [1, 2, 3, 4]})

# Calling the function
print((check_if_column_values_are_blank('a')))
print((check_if_column_values_are_blank('b')))
print((check_if_column_values_are_blank('c')))
print((check_if_column_values_are_blank('d')))

#Example Output
True

# False
# False
# False
# False

#Remember to inspect code for bugs.