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add select docs
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@ -7,6 +7,20 @@
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函数
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------
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.. py:function:: select()
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示例::
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#选出涨停股
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C = CLOSE()
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x = select(C / REF(C, 1) - 1 >= 0.0995))
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:param Indicator cond: 条件指标
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:param Datetime start: 起始日期
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:param Datetime end: 结束日期
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:param bool print_out: 打印选中的股票
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:rtype: 选中的股票列表
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.. py:function:: get_log_level()
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获取当前日志打印级别
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