conn = sqlite3.connect(DB)
大富豪夜总会的霓虹灯曾是尖东的一道风景（图：南方人物周刊记者 方迎忠）
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"What an interesting Black History month this has turned out to be," he wrote. Black History month takes place in February in the US.
Imagine a vast shopping mall parking lot with thousands of individual parking spots and internal lanes (representing road segments within a cluster). No matter how complex it is inside, there are usually only a few key exits to the main roads. Our goal was to identify these natural "exits" for each map cluster. For instance, the complex road network around Amsterdam Airport Schiphol (see on OpenStreetMap) has many internal roads but limited primary access points.