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Here's a different approach that does hook up to presave to replace the contents of the editor at save time, just before saving, with the output from yapf:

yapf:
import subprocess
import wingapi

def run_yapf(doc=wingapi.kArgDocument):

  wingapi
 
def run_yapf(doc=wingapi.kArgDocument):
 
# Set to non-None to use an uninstalled copy of yapf
  kYapfDir = None
  #kYapfDir = '/Users/jpe/Documents/tmp/yapf'

  '/Users/jpe/Documents/tmp/yapf'
 
proj = wingapi.gApplication.GetProject()
  pyexec = proj.GetPythonExecutable(doc.GetFilename())

  proj.GetPythonExecutable(doc.GetFilename())
 
orig_text = doc.GetText()

  doc.GetText()
 
argv = [pyexec, '-m', 'yapf']
  process = subprocess.Popen(argv, cwd=kYapfDir, stdin=subprocess.PIPE,
                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  from_yapf, error_output = process.communicate(orig_text)
  if from_yapf != orig_text:
    doc.SetText(from_yapf)

doc.SetText(from_yapf)
 
def _connect_to_document(doc):
  def _on_presave(filename, encoding):
    # Called for autosave w/ filename set to non-None
    if filename is not None:
      return

    return
 
if doc.GetMimeType() == 'text/x-python':
   run_yapf(doc)
 
 
connect_id = doc.Connect('presave', _on_presave)

_on_presave)
 
def _init():
  wingapi.gApplication.Connect('document-open', _connect_to_document)
  for doc in wingapi.gApplication.GetOpenDocuments():
    _connect_to_document(doc)

_connect_to_document(doc)
 
_init()