1 files changed, 12 insertions, 2 deletions
diff --git a/Lib/idlelib/idle.py b/Lib/idlelib/idle.py
index c8a8fea..449fb0e 100644
--- a/Lib/idlelib/idle.py
+++ b/Lib/idlelib/idle.py
@@ -4,7 +4,17 @@ try:
     import idlelib.PyShell
 except ImportError:
     # IDLE is not installed, but maybe PyShell is on sys.path:
-    import PyShell
-    PyShell.main()
+    try:
+        import PyShell
+    except ImportError:
+        print "Can't locate PyShell.py"
+    else:
+        import os
+        idledir = os.path.dirname(os.path.abspath(PyShell.__file__))
+        if idledir != os.getcwd():
+            # We're not in the IDLE directory, help the subprocess find run.py
+            pypath = os.environ.get('PYTHONPATH', '')
+            os.environ['PYTHONPATH'] = pypath + ':' + idledir
+        PyShell.main()
 else:
     idlelib.PyShell.main()