[Bug #1622533] Make docstrings raw strings because they contain control characters (\0, \1)

Lib/StringIO.py

@@ -137,7 +137,7 @@ class StringIO:
         return r
 
     def readline(self, length=None):
-        """Read one entire line from the file.
+        r"""Read one entire line from the file.
 
         A trailing newline character is kept in the string (but may be absent
         when a file ends with an incomplete line). If the size argument is

Lib/difflib.py

@@ -1311,7 +1311,7 @@ def ndiff(a, b, linejunk=None, charjunk=IS_CHARACTER_JUNK):
 
 def _mdiff(fromlines, tolines, context=None, linejunk=None,
            charjunk=IS_CHARACTER_JUNK):
-    """Returns generator yielding marked up from/to side by side differences.
+    r"""Returns generator yielding marked up from/to side by side differences.
 
     Arguments:
     fromlines -- list of text lines to compared to tolines