S- ABF DG F- A C G- AH EI 空FORH−DDECEEBCBCEif语句I−AEDEAEE空 else A- s i B- = == += C- 0 20 5 D- for in range if continue else print type E- 转换成s=0 for i in range20 if i5==0 conti

S -> ABF | DG F -> A | C G -> AH | EI | ε H -> DDECEE | BCBCE I -> AE | DEAEE | ε A -> s | i B -> = | % | == | += C -> 0 | 20 | 5 D -> for | in | range | if | continue | else | print | type E -> ( | ) | : 空() -> ε