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JasonLaw
V2EX  ›  Python

为什么 Generator expression must be parenthesized?

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  •   JasonLaw · Jan 7, 2023 · 2612 views
    This topic created in 1220 days ago, the information mentioned may be changed or developed.

    我在做First Unique Character in a String - LeetCode的时候,碰到“SyntaxError: Generator expression must be parenthesized”。

    我想知道的是,多个参数时,为什么 Generator expression must be parenthesized ?

    # 重现代码
    class Solution:
        def firstUniqChar(self, s: str) -> int:
            char_to_index = {}
            for i, c in enumerate(s):
                if c in char_to_index:
                    char_to_index[c] = -1
                else:
                    char_to_index[c] = i
    
            return min(
                index for index in char_to_index.values() if index != -1,
                default=-1
            )
    
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