* 核心功能：每次调用next(val)，返回当前价格的跨度（往回数≤当前价格的最大连续天数）
Film type: Polaroid i-Type Color Film (sold separately) / Film size: 4.2 x 3.5-inch prints / Weight: 648 grams / Charging method: USB-C / Companion app: Yes / Other features: Flip-up lid, scene analysis feature
，更多细节参见一键获取谷歌浏览器下载
wire = { module = "com.squareup.wire:wire-runtime", version.ref = "wire" }。快连下载-Letsvpn下载对此有专业解读
+__init__(db_path: str)
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