Consolidate utils.pyfile into utils.openpy

IPython/core/ultratb.py

@@ -104,9 +104,9 b' from IPython.core.display_trap import DisplayTrap'
 from IPython.core.excolors import exception_colors
 from IPython.utils import PyColorize
 from IPython.utils import io
+from IPython.utils import openpy
 from IPython.utils import path as util_path
 from IPython.utils import py3compat
-from IPython.utils import pyfile
 from IPython.utils import ulinecache
 from IPython.utils.data import uniq_stable
 from IPython.utils.warn import info, error
@@ -837,7 +837,7 b' class VerboseTB(TBTools):'
                 continue
             elif file.endswith(('.pyc','.pyo')):
                 # Look up the corresponding source file.
-                file = pyfile.source_from_cache(file)
+                file = openpy.source_from_cache(file)
 
             def linereader(file=file, lnum=[lnum], getline=ulinecache.getline):
                 line = getline(file, lnum[0])

IPython/extensions/autoreload.py

@@ -119,7 +119,7 b' try:'
 except NameError:
     from imp import reload
 
-from IPython.utils import pyfile
+from IPython.utils import openpy
 from IPython.utils.py3compat import PY3
 
 #------------------------------------------------------------------------------
@@ -207,12 +207,12 b' class ModuleReloader(object):'
             path, ext = os.path.splitext(filename)
 
             if ext.lower() == '.py':
-                pyc_filename = pyfile.cache_from_source(filename)
+                pyc_filename = openpy.cache_from_source(filename)
                 py_filename = filename
             else:
                 pyc_filename = filename
                 try:
-                    py_filename = pyfile.source_from_cache(filename)
+                    py_filename = openpy.source_from_cache(filename)
                 except ValueError:
                     continue
 

IPython/utils/openpy.py

@@ -8,6 +8,7 b' from __future__ import absolute_import'
 
 import io
 from io import TextIOWrapper, BytesIO
+import os.path
 import re
 
 cookie_re = re.compile(ur"coding[:=]\s*([-\w.]+)", re.UNICODE)
@@ -217,3 +218,22 b' def _list_readline(x):'
     def readline():
         return next(x)
     return readline
+
+# Code for going between .py files and cached .pyc files ----------------------
+
+try:    # Python 3.2, see PEP 3147
+    from imp import source_from_cache, cache_from_source
+except ImportError:
+    # Python <= 3.1: .pyc files go next to .py
+    def source_from_cache(path):
+        basename, ext = os.path.splitext(path)
+        if ext not in ('.pyc', '.pyo'):
+            raise ValueError('Not a cached Python file extension', ext)
+        # Should we look for .pyw files?
+        return basename + '.py'
+    
+    def cache_from_source(path, debug_override=None):
+        if debug_override is None:
+            debug_override = __debug__
+        basename, ext = os.path.splitext(path)
+        return basename + '.pyc' if debug_override else '.pyo'