0
我想存儲和工作(從表達式和進一步訪問每個文字)像Python((A/B)/ C)的邏輯表達式。我找到了一個辦法。我張貼下面的代碼。但作爲初學者,我無法理解它。任何人都可以向我解釋這段代碼如何工作並給出所需的輸出。原諒我的任何錯誤,因爲這是我第一次使用stackoverflow。瞭解Python代碼來實現邏輯表達式
class Element(object):
def __init__(self, elt_id, elt_description=None):
self.id = elt_id
self.description = elt_description
if self.description is None:
self.description = self.id
def __or__(self, elt):
return CombinedElement(self, elt, op="OR")
def __and__(self, elt):
return CombinedElement(self, elt, op="AND")
def __invert__(self):
return CombinedElement(self, op="NOT")
def __str__(self):
return self.id
class CombinedElement(Element):
def __init__(self, elt1, elt2=None, op="NOT"):
# ID1
id1 = elt1.id
if isinstance(elt1, CombinedElement):
id1 = '('+id1+')'
# ID2
if elt2 is not None:
id2 = elt2.id
if isinstance(elt2, CombinedElement):
id2 = '('+id2+')'
# ELT_ID
if op == "NOT" and elt2 is None:
elt_id = "~"+id1
elif op == "OR":
elt_id = id1+" v "+id2
elif op == "AND":
elt_id = id1+"^"+id2
# SUPER
super(CombinedElement, self).__init__(elt_id)
a = Element("A")
b = Element("B")
c = Element("C")
d = Element("D")
e = Element("E")
print(a&b|~(c&d)|~e)
Output :
((A^B) v (~(C^D))) v (~E)