How to using python parser in "Script Evaluators" when element is Turn?

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11-29-2016 11:08 PM
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Occasional Contributor II

When calculate the turn value in the network dataset, is Turn.Angle only useful with VB Script? How to edit a pre-logic script code with turn.angle using python language?

ArcMap Version: 10.4.0.5524

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MVP Esteemed Contributor

Code blocks in the normal sense, call a function using ! enclosing field names, I don't know if that is your case.  You didn't look far enough down in the examples in the link I sent to see their example... so check it out and see if this matches your case.

def somefunc(val):
    if val.Angle > 270:
        turnTime = 10
    else:
        turnTime = 20
    return turnTime


# use this in the value= segment
somefunc(!Turn!)  # if Turn is a field

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MVP Esteemed Contributor

I don't understand your wrong section... you can't assign to a variable there.  The correct section, just takes the Turn and returns it's example.  More complex examples Types of evaluators used by a network—Help | ArcGIS for Desktop show a def being used and a field name enclosed in double exclamation marked being used

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Occasional Contributor II

I want to add some logic for calculate the turn time with different turn angle.

For example:

This Script Evaluator expression is valid in VB Script:

    If Turn.Angle > 270 Then
        turnTime = 10
    Else
        turnTime = 20
    End If

   Value = turnTime

However this is not valid in python script.

    if Turn.Angle > 270:
        turnTime = 10
    else:
        turnTime = 20

    Value = turnTime

Highlighted
MVP Esteemed Contributor

Code blocks in the normal sense, call a function using ! enclosing field names, I don't know if that is your case.  You didn't look far enough down in the examples in the link I sent to see their example... so check it out and see if this matches your case.

def somefunc(val):
    if val.Angle > 270:
        turnTime = 10
    else:
        turnTime = 20
    return turnTime


# use this in the value= segment
somefunc(!Turn!)  # if Turn is a field

View solution in original post