今天我在这个Python程序中遇到了一个困难的情况：
a = [False, True]
x = True in a in a
y = True in a in [a]
z = True in a in (a)
print(x, y, z)
这段代码的输出是
a = [False, True]
x = True in a in a
y = True in a in [a]
z = True in a in (a)
print(x, y, z)
这怎么可能？
让我们在x这里测试：
x = True in a in a
True in [False, True]是True，又True in [False, True] …