Reportlab错误:“Table”对象没有属性“_colpositions”

I'm trying to teach myself reportlab from the user guide. The document I need to create is just formatted text that needs to go in specific places on the page. In the following snippets, table_data is a list containing 3 strings. I imported Table as pdfTable because my application has a Table class. I'm trying to teach myself reportlab from the u