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#!/usr/bin/env python3
"""
Demo of filtering capabilities
"""
from allpairspy import AllPairs
def is_valid_combination(row):
"""
This is a filtering function. Filtering functions should return True
if combination is valid and False otherwise.
Test row that is passed here can be incomplete.
To prevent search for unnecessary items filtering function
is executed with found subset of data to validate it.
"""
n = len(row)
if n > 1:
# Brand Y does not support Windows 98
if "98" == row[1] and "Brand Y" == row[0]:
return False
# Brand X does not work with XP
if "XP" == row[1] and "Brand X" == row[0]:
return False
if n > 4:
# Contractors are billed in 30 min increments
if "Contr." == row[3] and row[4] < 30:
return False
return True
# sample parameters are is taken from
# http://www.stsc.hill.af.mil/consulting/sw_testing/improvement/cst.html
parameters = [
["Brand X", "Brand Y"],
["98", "NT", "2000", "XP"],
["Internal", "Modem"],
["Salaried", "Hourly", "Part-Time", "Contr."],
[6, 10, 15, 30, 60],
]
print("PAIRWISE:")
for i, pairs in enumerate(AllPairs(parameters, filter_func=is_valid_combination)):
print(f"{i:2d}: {pairs}")
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