#!/usr/bin/env python3

class example:

def __init__ (self, answer):

self.answer = answer

def invalid (r1, r2):

return "This will never happen."

def added (r1, r2):

return "+added " + r2

def removed (r1, r2):

return "-removed " + r1

def both (r1, r2):

return removed(r1, r2) + "\n" + added(r1, r2)

def status (r1, r2):

return (

[ invalid, added, removed, both ]

)[(r1 and 2 or 0) + (r2 and 1 or 0)](r1, r2)

r1 = example(None)

r2 = example(None)

print("How does a record get into the list of records to diff if it's not in either file?")

print(status(r1.answer, r2.answer))

r1 = example("record")

r2 = example(None)

print("should be \"removed\"")

print(status(r1.answer, r2.answer))

r1 = example(None)

r2 = example("record")

print("should be \"added\"")

print(status(r1.answer, r2.answer))

r1 = example("record")

r2 = example("record")

print("should be \"removed\" and then \"added\"")

print(status(r1.answer, r2.answer))