1、 创建一个名为test.py的Python脚本文件，文件名可自定义。 2、 生成0到1之间的一个随机小数。 3、 random.randint(a, b)用于生成一个位于a与b之间的整数，且包含a和b这两个边界值。例如，random.randint(1, 9)会返回1到9范围内的任意整数，包括1和9。 4、 从指定列表中 ...

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A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Identifying causal relationships from observational data is not easy. Still, ...