title: Python Pathlib path object not converting to string
body: <p>I am trying to use Shutil to copy a pdf file using path objects from Pathlib, however when I run my code I get the error "str object is not callable"
  when converting my paths back to strings using str(). Any explanation for why this is occurring would be very helpful. Thanks!</p>
  
  <pre><code>from pathlib import Path
  from wand.image import Image as wandImage
  import shutil
  import sys
  import os
  
  def pdf2Jpeg(pdf_path):
      pdf = pdf_path
      jpg = pdf[:-3] + "jpg"
      img = wandImage(filename=pdf)
      img.save(filename=jpg)
  
  src0 = Path(r"G:\Well Schematics\Well Histories\Merged")
  dst0 = Path(r"G:\Well Schematics\Well Histories\Out")
  if not dst0.exists():
      dst0.mkdir()
  
  pdfs = []
  api = ''
  name = ''
  pnum = ''
  imgs = []
  
  for pdf in src0.iterdir():
      pdfs.append(pdf)
  
  for pdf in pdfs:
  
      if not dst0.exists():
          dst0.mkdir()
  
      str = str(pdf.stem)
      split = str.split('_')
      api = split[0]
      name = split[1]
      pnum = split[2]
  
      shutil.copy(str(pdf), str(dst0))
      for file in dst0.iterdir():
          newpdf = file
      pdf2Jpeg(str(newpdf))
      newpdf.unlink()
  </code></pre>