Turns a chronological sequence of balance-adjustment events into a timeline of periods during which particular balances were held.
For example, this sequence of events …
- A: $10
- B: $10
- C: ($18)
- D: ($2)
… is turned into this timeline:
A B C D | | | | |_____________|_____________| | | | | | $10 | | |___________________________| | | | | | $8 | | |_____________|_____________| | | | $2 | |___________________________|
This lets you determine, for each balance reduction event, the events from which the balance was added. In this example, we can see that:
- The $18 reduction in event C came from $10 of event A and $8 of B.
- The $2 reduction in event D came entirely from event B.
Code for this example:
from refund_calculation import * history_from_event_sequence([ Event(time='A', delta='10'), Event(time='B', delta='10'), Event(time='C', delta='-18'), Event(time='D', delta='-2'), ]) # Result: History( closed=( Closed(amount=Decimal('10'), start='A', end='C'), Closed(amount=Decimal('8'), start='B', end='C'), Closed(amount=Decimal('2'), start='B', end='D'), ), open=(), debt=Decimal('0'), )
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