echarts读取csv文件

要使用ECharts读取CSV文件，你需要在Flask应用中使用pandas库将CSV文件中的数据提取出来，并将提取到的数据传递给ECharts实例。在你提供的代码中，可以在index函数中将data['DATE']和data['TMAX']的值传递给index.html文件。

首先，在index函数中添加以下代码来读取CSV文件中的数据：

data = pd.read_csv(filename)
dates = data['DATE'].values.tolist()
value = data['TMAX'].values.tolist()
`<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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