用符号表示如下： E→T|E+T|E-T T→F|T*F|T/F F→i|(E) 2、消去上面文法的左递归 E→TE1 E1 →+TE1|-TE1|ε T→FT1 T1→*FT1|/FT1|ε F →i|(E) 3. 按消去左递归的文法，使用Python语言，写出对应的递归下降语法分析器。

以下是Python代码：

def match_terminal(expected_token, tokens, index):
    if tokens[index] == expected_token:
        return index + 1
    else:
        return -1

def parse_E(tokens, index):
    index = parse_T(tokens, index)
    if index == -1:
        return -1
    else:
        return parse_E1(tokens, index)

def parse_E1(tokens, index):
    next_index = match_terminal('+', tokens, index)
    if next_index != -1:
        next_index = parse_T(tokens, next_index)
        if next_index == -1:
            return -1
        else:
            return parse_E1(tokens, next_index)
    else:
        next_index = match_terminal('-', tokens, index)
        if next_index != -1:
            next_index = parse_T(tokens, next_index)
            if next_index == -1:
                return -1
            else:
                return parse_E1(tokens, next_index)
        else:
            return index

def parse_T(tokens, index):
    index = parse_F(tokens, index)
    if index == -1:
        return -1
    else:
        return parse_T1(tokens, index)

def parse_T1(tokens, index):
    next_index = match_terminal('*', tokens, index)
    if next_index != -1:
        next_index = parse_F(tokens, next_index)
        if next_index == -1:
            return -1
        else:
            return parse_T1(tokens, next_index)
    else:
        next_index = match_terminal('/', tokens, index)
        if next_index != -1:
            next_index = parse_F(tokens, next_index)
            if next_index == -1:
                return -1
            else:
                return parse_T1(tokens, next_index)
        else:
            return index

def parse_F(tokens, index):
    next_index = match_terminal('i', tokens, index)
    if next_index != -1:
        return next_index
    else:
        next_index = match_terminal('(', tokens, index)
        if next_index != -1:
            next_index = parse_E(tokens, next_index)
            if next_index == -1:
                return -1
            else:
                return match_terminal(')', tokens, next_index)
        else:
            return -1

def parse(tokens):
    index = parse_E(tokens, 0)
    if index != -1 and index == len(tokens):
        print("RIGHT, AGAIN! 语法分析完毕!")
    else:
        print("WRONG! 退出语法分析!")

tokens = ['i', '+', 'i', '*', 'i', '#']
parse(tokens)