fix bug in notebook

output/Traj.txt

@@ -1,76 +1,73 @@
-On
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-Off
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-On
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src/core/reachtube.py

@@ -41,7 +41,7 @@ def __init__(self, tube, variables, modes):
 
         curMode = ""
         for line in tube:
-            if isinstance(line, unicode):
+            if isinstance(line, unicode) or isinstance(line, str):
                 curMode = line.split('->')[-1].split(',')[0] # Get current mode name
                 for var in ['t']+self.variables:
                     self.tubeDic[curMode][var].append(line)