python-03 ==与is的作用区别

#==是判别是否相等，is是判别是否指向同一个内存地址
a = [1, 2, 3]
b = [1, 2, 3]
a == b
#True
a is b
#False
c = a
c is a
#True
#可以用id(a)存看a所存的单元地址