Suppose I had a Python/Pandas dataframe called df1 with columns a and b, each with only one record (a = 1 and b = 2). I want to create a third column, c, whose value equals a + b or 3. Suppose I had a Python/Pandas dataframe called
阅读背景：
在Python / Pandas数据框中创建新列时，有没有办法避免键入数据框名称，括号和引号？
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