DOC: Cookbook example on reading CSV by chunking gives error

[nipunbatra]

URL linked in the cookbook: http://stackoverflow.com/questions/11622652/large-persistent-dataframe-in-pandas/12193309#12193309

Traceback:

  File "/usr/local/lib/python2.7/dist-packages/pandas/tools/merge.py", line 929, in concat
    verify_integrity=verify_integrity)
  File "/usr/local/lib/python2.7/dist-packages/pandas/tools/merge.py", line 944, in __init__
    '"{0}"'.format(type(objs).__name__))
AssertionError: first argument must be a list-like of pandas objects, you passed an object of type "TextFileReader"

To be precise: Concatenation does not work in this example.

[jreback]

what version pandas?

[nipunbatra]

0.13.1

[jreback]

want to submit a PR for this?

I think you can add a check for __iter__ where this assertionerror happens; but that might be too loose a check (IIRC this checks types very explicity)

[nipunbatra]

@jreback : Sorry! Won't be able to do a PR. schedule is tight..

Maybe if you can update the Stack overflow answer on how to solve this, it may suffice? Like for version 0.13.1 this is how you do the same..

[jreback]

@nipunreddevil updated the SO answer (maybe edit more if you want). and fixed in master/0.14 by #6941