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题目：
题解：
from enum import Enumclass Solution:def isNumber(self, s: str) -> bool:State = Enum("State", ["STATE_INITIAL","STATE_INT_SIGN","STATE_INTEGER","STATE_POINT","STATE_POINT_WITHOUT_INT","STATE_FRACTION","STATE_EXP","STATE_EXP_SIGN","STATE_EXP_NUMBER","STATE_END"])Chartype = Enum("Chartype", ["CHAR_NUMBER","CHAR_EXP","CHAR_POINT","CHAR_SIGN","CHAR_ILLEGAL"])def toChartype(ch: str) -> Chartype:if ch.isdigit():return Chartype.CHAR_NUMBERelif ch.lower() == "e":return Chartype.CHAR_EXPelif ch == ".":return Chartype.CHAR_POINTelif ch == "+" or ch == "-":return Chartype.CHAR_SIGNelse:return Chartype.CHAR_ILLEGALtransfer = {State.STATE_INITIAL: {Chartype.CHAR_NUMBER: State.STATE_INTEGER,Chartype.CHAR_POINT: State.STATE_POINT_WITHOUT_INT,Chartype.CHAR_SIGN: State.STATE_INT_SIGN},State.STATE_INT_SIGN: {Chartype.CHAR_NUMBER: State.STATE_INTEGER,Chartype.CHAR_POINT: State.STATE_POINT_WITHOUT_INT},State.STATE_INTEGER: {Chartype.CHAR_NUMBER: State.STATE_INTEGER,Chartype.CHAR_EXP: State.STATE_EXP,Chartype.CHAR_POINT: State.STATE_POINT},State.STATE_POINT: {Chartype.CHAR_NUMBER: State.STATE_FRACTION,Chartype.CHAR_EXP: State.STATE_EXP},State.STATE_POINT_WITHOUT_INT: {Chartype.CHAR_NUMBER: State.STATE_FRACTION},State.STATE_FRACTION: {Chartype.CHAR_NUMBER: State.STATE_FRACTION,Chartype.CHAR_EXP: State.STATE_EXP},State.STATE_EXP: {Chartype.CHAR_NUMBER: State.STATE_EXP_NUMBER,Chartype.CHAR_SIGN: State.STATE_EXP_SIGN},State.STATE_EXP_SIGN: {Chartype.CHAR_NUMBER: State.STATE_EXP_NUMBER},State.STATE_EXP_NUMBER: {Chartype.CHAR_NUMBER: State.STATE_EXP_NUMBER},}st = State.STATE_INITIALfor ch in s:typ = toChartype(ch)if typ not in transfer[st]:return Falsest = transfer[st][typ]return st in [State.STATE_INTEGER, State.STATE_POINT, State.STATE_FRACTION, State.STATE_EXP_NUMBER, State.STATE_END]这篇关于Python | Leetcode Python题解之第65题有效数字的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
