Extract variables

setuptools/msvc9_support.py

@@ -27,13 +27,15 @@ def patch_for_specialized_compiler():
 def find_vcvarsall(version):
     Reg = distutils.msvc9compiler.Reg
     VC_BASE = r'Software\%sMicrosoft\DevDiv\VCForPython\%0.1f'
+    key = VC_BASE % ('', version)
     try:
         # Per-user installs register the compiler path here
-        productdir = Reg.get_value(VC_BASE % ('', version), "installdir")
+        productdir = Reg.get_value(key, "installdir")
     except KeyError:
         try:
             # All-user installs on a 64-bit system register here
-            productdir = Reg.get_value(VC_BASE % ('Wow6432Node\\', version), "installdir")
+            key = VC_BASE % ('Wow6432Node\\', version)
+            productdir = Reg.get_value(key, "installdir")
         except KeyError:
             productdir = None