[英]How to simplify boolean expression with not and or?
我有以下布爾表達式:
not (start_date > b or s > end_date)
如何簡化呢?
def is_date_in_items(end_date, start_date, items):
b, s = _get_biggest_and_smallest_date(items)
return not (start_date > b or s > end_date)
not (start_date > b or s > end_date)
// is equivalent to
not(start_date > b) and not(s > end_date)
// which is equivalent to
start_data <= b and s <= end_date
這來自De Morgan的法律 ,該法律指出:
¬(P OR Q) <=> (¬P) AND (¬Q)
您可以將其縮短:
start_date <= b and s <=end_date
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