Christopher Welborn added the comment:

Oops, I did. Thanks for that.

So setContent overwrites the file like open('myfile', 'w').write() would, 
except it has an option to give the temporary file a different extension (in 
case of a crash while writing). That's understandable for Twisted.
getContent returns a file-like object, which is more like Path's open().

One thing I am not seeing is a readlines/writelines in these two libaries. I 
still think they would be useful, even without the size argument for readlines.

So this is what I am seeing now:
  read_text(encoding=None)
  readlines_text(encoding=None)  ..(or read_textlines?)
  read_bytes()
  readlines_bytes()
  write(data, append=False)  ..(mode is decided based on data type)
  writelines(lines, append=False)

..determining the mode for writelines looks at the first item's type?

The regular writelines fails with 'must be str, not [insert wrong type]' when 
opened with 'w', and '[insert wrong type] does not support the buffer 
interface' when opened with 'wb'.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20218>
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