Run an ExternalOperation that represents arbitrary code evaluation in Python:

Use the second argument to pass an evaluation context:

Define an ExternalOperation that creates a function in Python:

Call the function by running the ExternalOperation "Call":

Run the operation using ExternalEvaluate :

Any argument of the "Call" operation can be an ExternalOperation :

Arguments can also be passed directly in ExternalEvaluate by doing:

The result is equivalent to running the following Python code:

Start a Python session to work with dates:

Return an ExternalObject for a datetime object:

Extract the year attribute by using "GetAttribute":

The result is equivalent to running the following Python code:

Delete the session:

Start a Python session to work with decimal numbers:

Get the context for the decimal module:

Set the precision to 6:

Check that the precision was set to 6:

The result is equivalent to running the following Python code:

Delete the session:

Create an ExternalObject that represents the current date:

Use "Expression" to return the object as a Wolfram Language expression:

The Cast operation can also run in ExternalObject subvalues:

The symbol Expression is a shortcut for the same:

Return the object as a string:

The symbol String is a shortcut for the same:

Return the object as an ExternalObject :

The symbol ExternalObject is a shortcut for the same:

The same can be achieved by using "ReturnType" in ExternalEvaluate :

Delete the session: