相关疑难解决方法(0)

>>> s1 = "spam"
>>> s2 = "spam"
>>> s1 is s2
True
>>> q = 'asdalksdjfla;ksdjf;laksdjfals;kdfjasl;fjasdf'
>>> r = 'asdalksdjfla;ksdjf;laksdjfals;kdfjasl;fjasdf'
>>> q is r
False

应该s1 is s2给多少个角色False？限制在哪里？即,我问在python开始制作单独的副本之前,字符串必须有多长.