A simple, do nothing lambdas function on a DataFrame

simple_lambdas_ondf.py

# copy col2 value into a new column
col_new = str(col1 + '_new')
df[col_new] = df.apply(lambda x: x[col2] , axis=1)
print(df[[col1, col_new, col2]].head(2))

# output

"""
event_date event_date_new received_date
2011-01-05     2011-01-31    2011-01-31
2011-01-05     2011-01-31    2011-01-31
"""