Add work-a-round for tkinter usage with virtualenv under windows, see:

pypa/virtualenv#93

Author: jedie

README.creole

@@ -412,6 +412,9 @@ Six is a Python 2 and 3 compatibility library.
 
 == History
 
+* [[https://github.com/jedie/DragonPy/compare/v0.5.0...v0.5.1|??.08.2015 - v0.5.1]]: (not released, yet)
+** Add a "starter GUI"
+** Add work-a-round for tkinter usage with virtualenv under windows, see: [[https://github.com/pypa/virtualenv/issues/93|virtualenv issues #93]]
 * [[https://github.com/jedie/DragonPy/compare/v0.4.0...v0.5.0|18.08.2015 - v0.5.0]]:
 ** ROM files will be downloaded on-the-fly ({{{.sh}}} scripts are removed. So it's easier to use under Windows)
 * [[https://github.com/jedie/DragonPy/compare/v0.3.2...v0.4.0|26.05.2015 - v0.4.0]]:

dragonpy/__init__.py

@@ -1,2 +1,74 @@
+import os
+import sys
 
-__version__ = "0.5.0"
+
+__version__ = "0.5.1.dev0"
+
+
+def fix_virtualenv_tkinter():
+    """
+    work-a-round for tkinter under windows in a virtualenv:
+      "TclError: Can't find a usable init.tcl..."
+    Known bug, see: https://github.com/pypa/virtualenv/issues/93
+
+    There are "fix tk" file here:
+
+          C:\Python27\Lib\lib-tk\FixTk.py
+          C:\Python34\Lib\tkinter\_fix.py
+
+    These modules will be automatic imported by tkinter import.
+
+    The fix set theses environment variables:
+
+        TCL_LIBRARY C:\Python27\tcl\tcl8.5
+        TIX_LIBRARY C:\Python27\tcl\tix8.4.3
+        TK_LIBRARY C:\Python27\tcl\tk8.5
+
+        TCL_LIBRARY C:\Python34\tcl\tcl8.6
+        TIX_LIBRARY C:\Python34\tcl\tix8.4.3
+        TK_LIBRARY C:\Python34\tcl\tk8.6
+
+    but only if:
+
+          os.path.exists(os.path.join(sys.prefix,"tcl"))
+
+    And the virtualenv activate script will change the sys.prefix
+    to the current env. So we temporary change it back to sys.real_prefix
+    and import the fix module.
+    If the fix module was imported before, then we reload it.
+    """
+    if "TCL_LIBRARY" in os.environ:
+        # Fix not needed (e.g. virtualenv issues #93 fixed?)
+        return
+
+    if not hasattr(sys, "real_prefix"):
+        # we are not in a activated virtualenv
+        return
+
+    if sys.version_info[0] == 2:
+        # Python v2
+        virtualprefix = sys.prefix
+        sys.prefix = sys.real_prefix
+
+        import FixTk
+
+        if "TCL_LIBRARY" not in os.environ:
+            reload(FixTk)
+
+        sys.prefix = virtualprefix
+    else:
+        # Python v3
+        virtualprefix = sys.base_prefix
+        sys.base_prefix = sys.real_prefix
+
+        from tkinter import _fix
+
+        if "TCL_LIBRARY" not in os.environ:
+            from imp import reload
+            reload(_fix)
+
+        sys.base_prefix = virtualprefix
+
+
+if sys.platform.startswith("win"):
+    fix_virtualenv_tkinter()