def calc(self, a_val, b_val):
# This needs to return a list, since it is a list of outputs
"""
Add a_test and b_test.
:param a_val: Can be a number or a string.
:param b_val: Can be a number or a string.
:return: Return the sum of a_test and b_test.
"""
return [misc.add(a_val, b_val)]
def __call__(self, context, var1, var2, var_out):
"""
Add two columns together, put the answer in a new column.
:param context: The context instance, used to move data around.
:param var1: The values in this column are added.
:param var2: The values in this column are added.
:param var_out: The new column name, with the values of var1 + var2.
"""
context.exposure_att[var_out] = misc.add(context.exposure_att[var1],
context.exposure_att[var2])