diff --git a/BaseTools/Source/Python/AutoGen/GenMake.py b/BaseTools/Source/Python/AutoGen/GenMake.py
index 4da10e3950..0e886967cc 100644
--- a/BaseTools/Source/Python/AutoGen/GenMake.py
+++ b/BaseTools/Source/Python/AutoGen/GenMake.py
@@ -485,7 +485,7 @@ cleanlib:
             # EdkII modules always use "_ModuleEntryPoint" as entry point
             ImageEntryPoint = "_ModuleEntryPoint"
 
-        for k, v in MyAgo.Module.Defines.iteritems():
+        for k, v in MyAgo.Module.Defines.items():
             if k not in MyAgo.Macros:
                 MyAgo.Macros[k] = v
 
@@ -497,7 +497,7 @@ cleanlib:
             MyAgo.Macros['IMAGE_ENTRY_POINT'] = ImageEntryPoint
 
         PCI_COMPRESS_Flag = False
-        for k, v in MyAgo.Module.Defines.iteritems():
+        for k, v in MyAgo.Module.Defines.items():
             if 'PCI_COMPRESS' == k and 'TRUE' == v:
                 PCI_COMPRESS_Flag = True
 
@@ -661,7 +661,7 @@ cleanlib:
             "module_relative_directory" : MyAgo.SourceDir,
             "module_dir"                : mws.join (self.Macros["WORKSPACE"], MyAgo.SourceDir),
             "package_relative_directory": package_rel_dir,
-            "module_extra_defines"      : ["%s = %s" % (k, v) for k, v in MyAgo.Module.Defines.iteritems()],
+            "module_extra_defines"      : ["%s = %s" % (k, v) for k, v in MyAgo.Module.Defines.items()],
 
             "architecture"              : MyAgo.Arch,
             "toolchain_tag"             : MyAgo.ToolChain,
diff --git a/BaseTools/Source/Python/Workspace/DscBuildData.py b/BaseTools/Source/Python/Workspace/DscBuildData.py
index 0dad04212e..9c5596927f 100644
--- a/BaseTools/Source/Python/Workspace/DscBuildData.py
+++ b/BaseTools/Source/Python/Workspace/DscBuildData.py
@@ -1676,7 +1676,7 @@ class DscBuildData(PlatformBuildClassObject):
             else:
                 PcdValueDict[PcdCName, TokenSpaceGuid] = {SkuName:(PcdValue, DatumType, MaxDatumSize)}
 
-        for ((PcdCName, TokenSpaceGuid), PcdSetting) in PcdValueDict.iteritems():
+        for ((PcdCName, TokenSpaceGuid), PcdSetting) in PcdValueDict.items():
             if self.SkuIdMgr.SystemSkuId in PcdSetting:
                 PcdValue, DatumType, MaxDatumSize = PcdSetting[self.SkuIdMgr.SystemSkuId]
             elif TAB_DEFAULT in PcdSetting:
diff --git a/BaseTools/Source/Python/build/build.py b/BaseTools/Source/Python/build/build.py
index d07c8f84d6..94074b89b4 100644
--- a/BaseTools/Source/Python/build/build.py
+++ b/BaseTools/Source/Python/build/build.py
@@ -2088,7 +2088,7 @@ class Build():
 
                     # Look through the tool definitions for GUIDed tools
                     guidAttribs = []
-                    for (attrib, value) in self.ToolDef.ToolsDefTxtDictionary.iteritems():
+                    for (attrib, value) in self.ToolDef.ToolsDefTxtDictionary.items():
                         if attrib.upper().endswith('_GUID'):
                             split = attrib.split('_')
                             thisPrefix = '_'.join(split[0:3]) + '_'