Initial commit: Python learning project with examples and exercises

2025-07-20 17:08:50 +08:00
commit bc7bb56271
111 changed files with 11535 additions and 0 deletions
@@ -0,0 +1,67 @@
+S = []  # 以列表形式存储子句集S
+
+""" 读取子句集文件中子句，并存放在S列表中 - 每个子句也是以列表形式存储 - 以析取式分割 - 例如：～p ∨ ～q ∨ r 存储形式为 ['～p', '～q', 'r'] """
+
+def readClauseSet(filePath):
+    # global S
+    for line in open(filePath, mode='r', encoding='utf-8'):
+        line = line.replace(' ', '').strip()
+        line = line.split('∨')
+        S.append(line)
+    print(S)
+
+
+""" - 为正文字，则返回其负文字 - 为负文字，则返回其正文字 """
+def opposite(clause):
+    if '～' in clause:
+        return clause.replace('～', '')
+    else:
+        return '～' + clause
+
+
+""" 归结 """
+def resolution():
+    # global S
+    end = False
+    while True:
+        if end: break
+        father = S.pop()
+        print('father:',father)
+        for i in father[:]:
+            if end: break
+            for mother in S[:]:
+                print('mother:',mother)
+                if end: break
+                j = list(filter(lambda x: x == opposite(i), mother))
+                if j==[]:
+                    continue
+                else:
+                    print('\n亲本子句：' + ' ∨ '.join(father) + ' 和 ' + ' ∨ '.join(mother))
+                    father.remove(i)
+                    mother.remove(j[0])
+                    print(father,mother)
+                    #********** Begin **********#
+                    if father==[] and mother==[]:
+                        print('归结式：NIL')
+                        end = True                      
+                    elif father==[]:
+                        print('归结式：' + ' ∨ '.join(mother))
+                    elif mother==[]:
+                        print('归结式：' + ' ∨ '.join(father))
+                    else:
+                        new_clause = father + mother  # 创建新的归结式
+                        print('归结式：' + ' ∨ '.join(new_clause))
+                        S.append(new_clause)  # 将新的归结式添加到 S 中
+        
+                    print('S:',S)
+                    #********** End **********#
+                    
+                    
+def main():
+    filePath = r'命题逻辑归结推理系统S.txt'
+    readClauseSet(filePath)
+    resolution()
+
+
+if __name__ == '__main__':
+    main()