Fix and improve processProgess.

pym/cl_utils.py

@@ -290,21 +290,26 @@ class processProgress(process):
             self.processInit()
             self._open()
             if self.cacheresult is None:
-                self.cacheresult = ""
+                self.cacheresult = []
                 self.buf = ""
                 part = self.pipe.stdout.read(1)
                 while part:
-                    self.buf += part
+                    if self.buf:
+                        self.buf += part
+                    else:
+                        self.buf = part
                     if self.processStdout():
                         self.processDraw()
-                    self.cacheresult += part
+                    self.cacheresult.append(part)
                     part = self.pipe.stdout.read(self.readsize)
                 self.pipe.poll()
                 self.processEnd(self.success())
         except KeyboardInterrupt:
+            self.cacheresult = "".join(self.cacheresult)
             self.pipe.kill()
             self.processEnd(False)
             raise KeyboardInterrupt()
+        self.cacheresult = "".join(self.cacheresult)
         return self.cacheresult
 
     def processInit(self):