What is the following Python program doing?

from io import StringIO

import pandas as pd

import numpy as np

print("##################################")

print("# #")

print("# Live Lesson #4 #") print("# #")

print("##################################")

#

def my_test(a, b):

return a % b

df = pd.DataFrame({'a' : np.random.randn(6),

'b' : ['foo', 'bar'] * 3,

'c' : np.random.randn(6)})

df['Value'] = df.apply(lambda row: my_test(row['a'], row['c']), axis=1)

print(df)