Josh Rosenberg added the comment:

You're supposed to use that code to create a file (the output file is just 
""+""+""+""+""+""+""+""+""+...+"").

If you want something that won't MemoryError generating the file, this is a 
"memory free" version of the code to generate the file:

import itertools, sys
sys.stdout.writelines(itertools.repeat('""+', 2**17))
print('""')

Run that code (saved as whatever file name you like) and pipe the output to 
mega_concat.py, then run mega_concat.py to repro.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22583>
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