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+# Dynamo tips and frequently used code snippets
+
+## DesignScript
+
+### Multi level if:
+
+```
+Test ? a@@-1: b@-2;
+```
+
+### Convert float to integer:
+
+```
+x:int
+```
+
+## Reinstall
+
+Ha nem engedi felrakni mert nyavalyog, hogy fent van már másik, akkor itt kell kitörölni registryben:
+
+```
+HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Dynamo...
+```
+
+Or the fixit tool: https://support.microsoft.com/en-us/help/17588/windows-fix-problems-that-block-programs-being-installed-or-removed
+
+## Python
+
+### Import
+
+```python
+import clr
+clr.AddReference("ProtoGeometry")
+from Autodesk.DesignScript.Geometry import *
+
+# Import RevitAPI
+clr.AddReference("RevitAPI")
+from Autodesk.Revit.DB import *
+clr.AddReference("RevitAPIUI")
+from Autodesk.Revit.UI import TaskDialog
+
+# Import DocumentManager and TransactionManager
+clr.AddReference("RevitServices")
+from RevitServices.Persistence import DocumentManager
+from RevitServices.Transactions import TransactionManager
+
+# Import ToProtoType, ToRevitType geometry conversion extension methods
+clr.AddReference("RevitNodes")
+import Revit
+clr.ImportExtensions(Revit.GeometryConversion)
+```
+
+### Access the Document and App:
+
+```python
+doc = DocumentManager.Instance.CurrentDBDocument
+uiapp = DocumentManager.Instance.CurrentUIApplication
+app = uiapp.Application
+```
+
+### Hogy bevegye a listát és az egy darab elemet is:
+
+```python
+if isinstance(IN[0], list):
+        views = UnwrapElement(IN[0])
+else:
+        views = [UnwrapElement(IN[0])]
+```