Target csv on Windows adds extra line

[charleslukowski]

Using Windows and Python 2.7 I get an extra line between all rows of my output.

[coolestpizzadude]

I had the same issue (on windows , python 2.7.10). It can be resolved by modifying 2 lines in the the file:
metl/source/base.py in OpenResource
Line 46 reads:
file_pointer = codecs.open( resource, mode, encoding )
I changed it into:
file_pointer = codecs.open( resource, mode+'b', encoding )

Line 49 reads:
file_pointer = codecs.open( resource, mode )
I changed it into:
file_pointer = codecs.open( resource, mode+'b' )

This means the mode parameter only gets changed if the resource is a file (and not an URL). Adding the 'b' seems necessary on windows (and it doesn't do anything on Linux, so it should be fine).
Maybe there is a more elegant solution, but this seems to work fine for me.

cheers!
Coolestpizzadude