Detect Capital LeetCode solution in Python

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class Solution:
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    def detectCapitalUse(self, word: str) -> bool:
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        l = len(word)
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        if l == 1:
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            return True
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        if word[0] == word[0].lower() and word[1] == word[1].upper():
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            return False
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        u = False
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        if word[0] == word[0].upper():
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            if word[1] == word[1].upper():
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                u = True
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        for i in word[2:]:
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            if i == i.upper() and u == False:
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                return False
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            elif i == i.lower() and u == True:
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                return False
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        return True