Dynamo works with node, each node have inputs and outputs and performs a specific task.
This is a short tutorial about how you can use your python skills with Revit and Dynamo software.
First, you need to start the Revit. I used Revit 2020 version.Then from Main menu use Manage and click on Dynamo icon to open the Dynamo window and press on New project or Open an old project.
You can add node by typing in the left area named Library editbox the name o the node and click when is find it.
For example, type Watch and then double click to add to the work area.
Dynamo use Python version 2.7.8 and scripts works with python modules and Dynamo node.
For example, I add some node's to the working area and I link to see how these works using the click and drag mouse features.
If you want to test the python scripting issue, then use the editbox and type Python Script.
Use double click to add to working area.
Search again the Watch node and add it.
To see the editor , use right click on Python Script and select the Edit... .
Now, you can have a image like this with an editor and a node named Python Script and a node named WatchLink the Python Script node with OUT with Watch, by click on OUT , drag with the mouse and then click on > input from Watch.
The script from the Python Script is this:
# Load the Python Standard and DesignScript Libraries
import sys
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
# The inputs to this node will be stored as a list in the IN variables.
dataEnteringNode = IN
# Place your code below this line
# Assign your output to the OUT variable.
OUT = 0
import time
from StringIO import StringIO
output = StringIO()
sys.stdout = output
t1 = time.time()
duration = time.time() - t1
print('Finished in {} seconds'.format(duration))
OUT = output.getvalue()
# let's the time module
print("Python version")
print (sys.version)
print("Version info.")
print (sys.version_info)
OUT = output.getvalue()