BaseTools: Refactor python except statements

Convert "except ... ," to "except ... as" to be compatible with python3.
Based on "futurize -f lib2to3.fixes.fix_except"

Contributed-under: TianoCore Contribution Agreement 1.1
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>

BaseTools/Source/Python/GenFds/FdfParser.py

@@ -921,7 +921,7 @@ class FdfParser:
                     return ValueExpression(Expression, MacroPcdDict)(True)
                 else:
                     return ValueExpression(Expression, MacroPcdDict)()
-            except WrnExpression, Excpt:
+            except WrnExpression as Excpt:
                 # 
                 # Catch expression evaluation warning here. We need to report
                 # the precise number of line and return the evaluation result
@@ -930,7 +930,7 @@ class FdfParser:
                                 File=self.FileName, ExtraData=self.__CurrentLine(), 
                                 Line=Line)
                 return Excpt.result
-            except Exception, Excpt:
+            except Exception as Excpt:
                 if hasattr(Excpt, 'Pcd'):
                     if Excpt.Pcd in GlobalData.gPlatformOtherPcds:
                         Info = GlobalData.gPlatformOtherPcds[Excpt.Pcd]
@@ -1368,7 +1368,7 @@ class FdfParser:
             while self.__GetFd() or self.__GetFv() or self.__GetFmp() or self.__GetCapsule() or self.__GetVtf() or self.__GetRule() or self.__GetOptionRom():
                 pass
 
-        except Warning, X:
+        except Warning as X:
             self.__UndoToken()
             #'\n\tGot Token: \"%s\" from File %s\n' % (self.__Token, FileLineTuple[0]) + \
             # At this point, the closest parent would be the included file itself
@@ -4776,7 +4776,7 @@ if __name__ == "__main__":
     import sys
     try:
         test_file = sys.argv[1]
-    except IndexError, v:
+    except IndexError as v:
         print "Usage: %s filename" % sys.argv[0]
         sys.exit(1)
 
@@ -4784,7 +4784,7 @@ if __name__ == "__main__":
     try:
         parser.ParseFile()
         parser.CycleReferenceCheck()
-    except Warning, X:
+    except Warning as X:
         print str(X)
     else:
         print "Success!"

BaseTools/Source/Python/GenFds/GenFds.py

@@ -335,10 +335,10 @@ def main():
         """Display FV space info."""
         GenFds.DisplayFvSpaceInfo(FdfParserObj)
 
-    except FdfParser.Warning, X:
+    except FdfParser.Warning as X:
         EdkLogger.error(X.ToolName, FORMAT_INVALID, File=X.FileName, Line=X.LineNumber, ExtraData=X.Message, RaiseError=False)
         ReturnCode = FORMAT_INVALID
-    except FatalError, X:
+    except FatalError as X:
         if Options.debug is not None:
             import traceback
             EdkLogger.quiet(traceback.format_exc())

BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py

@@ -721,7 +721,7 @@ class GenFdsGlobalVariable:
 
         try:
             PopenObject = subprocess.Popen(' '.join(cmd), stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
-        except Exception, X:
+        except Exception as X:
             EdkLogger.error("GenFds", COMMAND_FAILURE, ExtraData="%s: %s" % (str(X), cmd[0]))
         (out, error) = PopenObject.communicate()