StringIO and pandas read_csv

Question

I\'m trying to mix StringIO and BytesIO with pandas and struggling with some basic stuff. For example, I can\'t get \"output\" below to work, whereas \"output2\" below does

Answer 1

io.StringIO here is behaving just like a file -- you wrote to it, and now the file pointer is pointing at the end. When you try to read from it after that, there's nothing after the point you wrote, so: no columns to parse.

Instead, just like you would with an ordinary file, seek to the start, and then read:

>>> output = io.StringIO()
>>> output.write('x,y\n')
4
>>> output.write('1,2\n')
4
>>> output.seek(0)
0
>>> pd.read_csv(output)
   x  y
0  1  2