NameError: name 'i' is not defined - 为什么会发生这种情况？

我正在为我的班级制作一个相当简单的 wordle 克隆。它的功能与 wordle 完全相同，只是在 CLI 中。但是，我在测试时遇到了一个奇怪的错误。

执行时，python返回

Traceback (most recent call last):
File "<string>", line 46, in <module>
File "<string>", line 19, in input_guess
NameError: name 'i' is not defined

代码是

def input_guess():
    #gets input
    while True:
        guess = (str(input(f"Attempt {i + 1} >>> " ))).lower()
        if len(guess) != 5 or guess == int:
            print("Invalid input")
            continue
        else:
            return guess.lower()

def split(word):
    #splits word
    return list(word)

while attempts < 6:
   # wordle
    guess = split(input_guess())
    for i in guess:
        if guess[i] == word[i]: #green
            response[i] = guess[i]
        if guess[i] in word and guess[i] != word[i]: # yellow
            response[i] = "-"
        if guess[i] not in word: #miss
            response[i] = "_"

为什么我会收到此错误？我究竟做错了什么？我似乎无法绕过它。

干杯