使用Python IDLE shell编辑代码的时候显示NameError.

Question

S={1,2,3} R={(1,2),(2,1),(3,3),(1,1),(2,2)} def equivClass(S,R): return {frozenset({y for y in S if(x,y) in R}) for x in S}

equivClass(S,R) Traceback (most recent call last): File "<pyshell#6>", line 1, in equivClass(S,R) NameError: name 'S' is not defined

Answer 1

我这运行没有问题。。