Change double hyphens (en dashes) to em (longer) dashes

Doc/howto/cporting.rst

@@ -95,7 +95,7 @@ long/int Unification
 --------------------
 
 Python 3 has only one integer type, :func:`int`.  But it actually
-corresponds to Python 2's :func:`long` type--the :func:`int` type
+corresponds to Python 2's :func:`long` type—the :func:`int` type
 used in Python 2 was removed.  In the C-API, ``PyInt_*`` functions
 are replaced by their ``PyLong_*`` equivalents.
 

Doc/howto/curses.rst

@@ -35,7 +35,7 @@ before X is available.
 The curses library hides all the details of different terminals, and provides
 the programmer with an abstraction of a display, containing multiple
 non-overlapping windows.  The contents of a window can be changed in various
-ways-- adding text, erasing it, changing its appearance--and the curses library
+ways---adding text, erasing it, changing its appearance---and the curses library
 will automagically figure out what control codes need to be sent to the terminal
 to produce the right output.
 

Doc/library/hmac.rst

@@ -79,7 +79,7 @@ This module also provides the following helper function:
 
       If *a* and *b* are of different lengths, or if an error occurs,
       a timing attack could theoretically reveal information about the
-      types and lengths of *a* and *b*--but not their values.
+      types and lengths of *a* and *b*—but not their values.
 
 
    .. versionadded:: 2.7.7

Doc/library/io.rst

@@ -130,7 +130,7 @@ Module Interface
    the list of supported encodings.
 
    *errors* is an optional string that specifies how encoding and decoding
-   errors are to be handled--this cannot be used in binary mode.  Pass
+   errors are to be handled—this cannot be used in binary mode.  Pass
    ``'strict'`` to raise a :exc:`ValueError` exception if there is an encoding
    error (the default of ``None`` has the same effect), or pass ``'ignore'`` to
    ignore errors.  (Note that ignoring encoding errors can lead to data loss.)

Doc/library/pdb.rst

@@ -290,7 +290,7 @@ commands [*bpnumber*]
    return, jump, quit and their abbreviations) terminates the command list (as if
    that command was immediately followed by end). This is because any time you
    resume execution (even with a simple next or step), you may encounter another
-   breakpoint--which could have its own command list, leading to ambiguities about
+   breakpoint—which could have its own command list, leading to ambiguities about
    which list to execute.
 
    If you use the 'silent' command in the command list, the usual message about

Doc/library/whichdb.rst

@@ -11,8 +11,8 @@
 
 
 The single function in this module attempts to guess which of the several simple
-database modules available--\ :mod:`dbm`, :mod:`gdbm`, or :mod:`dbhash`\
---should be used to open a given file.
+database modules available—:mod:`dbm`, :mod:`gdbm`, or :mod:`dbhash`\
+—should be used to open a given file.
 
 
 .. function:: whichdb(filename)