我有這個(gè)代碼描述一個(gè)上下文無(wú)關(guān)的語(yǔ)法，我試圖生成匹配它的隨機(jī)字符串;例如，像這樣：“約翰認(rèn)為瑪麗討厭每只綠貓”但我目前的輸出是：[['_S', ['_NP _VP']], ['_NP', ['_Det _Adj _N', '_Det _N', '_Adj _PropN', '_PropN']], ['_VP', ['_Vi', '_Vt _NP', '_Vc _Comp _S']]][['_Det', ['the', 'a', 'some', 'any', 'every']], ['_Adj', ['green', 'young', 'tired', 'confused']], ['_N', ['dog', 'cat']], ['_PropN', ['John', 'Mary']], ['_Vi', ['sleeps', 'walks']], ['_Vt', ['loves', 'hates']], ['_Vc', ['says', 'thinks', 'believes']], ['_Comp', ['that']]]請(qǐng)幫忙！import randompsg_rules_str = "S → NP VP\n" \                "NP → Det Adj N | Det N | Adj PropN | PropN\n" \                "VP → Vi | Vt NP | Vc Comp S"terminals_str = "Det → the | a | some | any | every\n" \                "Adj → green | young | tired | confused\n" \                "N → dog | cat\n" \                "PropN → John | Mary\n" \                "Vi → sleeps | walks\n" \                "Vt → loves | hates\n" \                "Vc → says | thinks | believes\n" \                "Comp → that"psg_rules_list = [a.split("→") for a in psg_rules_str.split("\n")]for p in psg_rules_list:    p[0] = "_" + p[0].strip()    p[1] = p[1].split("|")    p[1] = ["_" + a.strip().replace(" ", " _") for a in p[1]]print(psg_rules_list)# [['_S', ['_NP _VP']], ['_NP', ['_Det _Adj _N', '_Det _N', '_Adj _PropN', '_PropN']], ['_VP', ['_Vi', '_Vt _NP', '_Vc _Comp _S']]]terminals_list = [a.split("→") for a in terminals_str.split("\n")]for t in terminals_list:    t[0] = "_" + t[0].strip()    t[1] = t[1].split("|")    t[1] = [a.strip() for a in t[1]]print(terminals_list)