title: SystemError: error return without exception set, when using requests and debugger
body: <p>Environment:
  Python 3.6.3
  Requests 2.18.4
  PyCharm 2018.1</p>
  
  <p>When using the above configuration in normal run everything is fine. However,when using PyCharm debugger my output is constantly giving me two kinds of exceptions:</p>
  
  <pre><code>Exception ignored in: &lt;generator object urlsplit.&lt;locals&gt;.&lt;genexpr&gt; at 0x7f69803940a0&gt;
  Traceback (most recent call last):
    File "/usr/lib/python3.6/urllib/parse.py", line 433, in &lt;genexpr&gt;
      if not rest or any(c not in '0123456789' for c in rest):
  </code></pre>
  
  <p>or </p>
  
  <pre><code>SystemError: error return without exception set
  Exception ignored in: &lt;generator object iter_slices at 0x7f69803940f8&gt;
  Traceback (most recent call last):
    File "/home/damian/workspace/DofusV2/venv/lib/python3.6/site-packages/requests/utils.py", line 449, in iter_slices
      def iter_slices(string, slice_length):
  `
  </code></pre>
  
  <p>This is not an issue in a single project, I had this issue  in numerous projects countless times. However, every project was multi-threaded ( I do not know if this makes any difference) 
  The thing is I do not have this problem when not using the debugger plus it doesn't really do anything the application is stable and works fine. My question is why is this happening and can I at least suppress it so it won't pollute my log?</p>