将DataFrame列连接成字符串

我有一个如下所示的DataFrame:

column_A   column_B
  2           4 
  7           1  
 Seven      Three
  34         23

我想将column_A和column_B的值作为单个字符串返回,如下所示:

concatenated_A = 2, 7, Seven, 34
concatenated_B = 4, 1, Three, 23

我已经尝试了下面的代码:

concatenated_A = df[column_A].to_json()
print(concatenated_A)

但它的打印方式如下:

{"0":"2", "1":"7", "2":"Seven", "3":"34"}

任何帮助都将不胜感激。

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