[processing] use hex representation of uuid

(cherry picked from commit 2466083)

Author: alexbruy

python/plugins/processing/tools/system.py

@@ -46,7 +46,7 @@ def userFolder():
 
 
 def defaultOutputFolder():
-    folder = os.path.join(userFolder(), "outputs")
+    folder = os.path.join(userFolder(), 'outputs')
     if not QDir(folder).exists():
         QDir().mkpath(folder)
 
@@ -60,7 +60,7 @@ def isWindows():
 def isMac():
     return sys.platform == 'darwin'
 
-_tempFolderSuffix = unicode(uuid.uuid4()).replace('-', '')
+_tempFolderSuffix = uuid.uuid4().hex
 
 
 def tempFolder():
@@ -96,7 +96,7 @@ def getTempFilenameInTempFolder(basename):
     """
 
     path = tempFolder()
-    path = os.path.join(path, unicode(uuid.uuid4()).replace('-', ''))
+    path = os.path.join(path, uuid.uuid4().hex)
     mkdir(path)
     basename = removeInvalidChars(basename)
     filename = os.path.join(path, basename)
@@ -108,7 +108,7 @@ def getTempDirInTempFolder():
     """
 
     path = tempFolder()
-    path = os.path.join(path, unicode(uuid.uuid4()).replace('-', ''))
+    path = os.path.join(path, uuid.uuid4().hex)
     mkdir(path)
     return path