for a in range(0,2):
for b in range(0,2):
for c in range(0,2):
for d in range(0,2):
x=(b==1 or c==1 or d==1)
y=(b==0 and c==1)
z=(a==1 or d==1)
if ((y and not x and not z) or (not y and x and z ) ) and a+b+c+d==1:
if a==1下
print("A是罪犯")
elif b==1:
print("B是罪犯")
elif c==1:
print("C是罪犯")
elif d==1:
print("D是罪犯")
通过遍历abcd的真值表,找到使得if ((y and not x and not z) or (not y and x and z ) ) and a+b+c+d==1:
处表达式为真的个数为1时对应的真值指派