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Python-向pandas DataFrame添加一行

我了解pandas旨在加载完全填充的内容,DataFrame但是我需要创建一个空的DataFrame然后逐行添加行。做这个的最好方式是什么 ?

我成功创建了一个空的DataFrame:

res = DataFrame(columns=('lib', 'qty1', 'qty2')) 

然后,我可以添加新行,并用以下字段填充字段:

res = res.set_value(len(res), 'qty1', 10.0) 

它有效,但看起来很奇怪:-/(添加字符串值失败)

如何将新行添加到DataFrame(具有不同的列类型)?
答案在这里


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