Don't ascii encode eol_convention. Was causing file write to fail.
diff --git a/Lib/idlelib/IOBinding.py b/Lib/idlelib/IOBinding.py
index dd51062..e1ca20d 100644
--- a/Lib/idlelib/IOBinding.py
+++ b/Lib/idlelib/IOBinding.py
@@ -249,9 +249,6 @@
firsteol = self.eol_re.search(chars)
if firsteol:
self.eol_convention = firsteol.group(0)
- if isinstance(self.eol_convention, str):
- # Make sure it is an ASCII string
- self.eol_convention = self.eol_convention.encode("ascii")
chars = self.eol_re.sub(r"\n", chars)
self.text.delete("1.0", "end")
self.set_filename(None)