为什么局部变量会在Python中循环

这段代码中发生了什么：

class Solution:
    def removeComments(self, source: List[str]) -> List[str]:
        in_block = False
        ans = []
        for line in source:
            print("current line:", line)
            i = 0
            if not in_block:
                newline = []
            while i < len(line):
                if line[i:i+2] == '/*' and not in_block:
                    in_block = True
                    i += 1
                elif line[i:i+2] == '*/' and in_block:
                    in_block = False
                    i += 1
                elif not in_block and line[i:i+2] == '//':
                    break
                elif not in_block:
                    print("line:", line, "line i:", line[i], "newline", newline)
                    newline.append(line[i])
                    print("newline after:", newline)
                i += 1
            if newline and not in_block:
                ans.append("".join(newline))
                print("ans:", ans)
        return ans

newline是在一行的每次迭代中创建的source（如果未打开块注释），那么newline当当前行位于“ b”时，代码如何以“ a”获得？

input: ["a/*comment", "line", "more_comment*/b"]
print:
current line: a/*comment
line: a/*comment line i: a newline []
newline after: ['a'] <= this makes sense, after removing everything after /*
current line: line <= this makes sense, we ignore this because the block comment is still open
current line: more_comment*/b <= at this last line, block comment is still open
line: more_comment*/b line i: b newline ['a'] <== this isn't supposed to happen
newline after: ['a', 'b'] <= how?
ans: ['ab']

在当前行=“ more_comment * / b”处，它是输入索引2处的项目source，newline不应存在​​于该行，因为它是在for循环内创建的。

我可以理解这种解决方案，因为在buffer循环之外创建了，并且每次将追加到后都会清除它output。但是，上面的代码使我完全困惑。