我尝试从B3 site抓取表格,但结果是一个空数据框。怎么了?import pandas as pdurl = "http://www2.bmf.com.br/pages/portal/bmfbovespa/lumis/lum-taxas-referenciais-bmf-ptBR.asp?Data=31/08/2020&Data1=20200831&slcTaxa=PRE"df = pd.read_html(io=url)print (df)
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