Can be used in conditional statements to
judge all or none
(bool(a and b and c) or not bool(a or b or c))
# 均无的话是true
not bool(a or b or c) == not(bool(a)) and not(bool(b)) and not(bool(c))
De Morgan's Law
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Origin blog.csdn.net/qq_42648305/article/details/111922736
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