import pandas as pd

# Create a DataFrame
df = pd.DataFrame({'A': [1, 2, 3, 4], 'B': [5, 6, 7, 8]})

# Create a Pandas column as a data frame
df['C'] = pd.DataFrame({'C': [9, 10, 11, 12]})

# Print data frame
print(df)

>>>

   A  B   C
0  1  5   9
1  2  6  10
2  3  7  11
3  4  8  12