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Esri Support provide an How To: Use IF statements in the Field Calculator: Summary The Field Calculator uses IF statements to calculate new values in the field of an attribute table. This article des …

Make sure that you have set your parser to Python (as suggested by @Arabella) and then try something more like this untested code: Pre-Logic Script Code: def selectter(Majr_src,Top_pct,Top_src,Close_s …

This should do it, and also deals with any empty or space-filled strings. Parser: Python Pre-Logic Script Code: def FixNull(Field1,Field2): if Field1 is None or Field1.strip() == "": return Fiel …

To do this I would use two Python string methods (format and zfill). I find workflows like this much easier when approached using arcpy.da.UpdateCursor() rather than the CalculateField_management() fu …

If you only want to use the abbreviations for labelling then you could investigate Using an abbreviation dictionary and the About abbreviating and truncating words page: Abbreviation dictionaries …

This statement: def Calculate(NearAngle): creates a variable named NearAngle but this code: if ( [NEAR_ANGLE] < 0 and [NEAR_ANGLE] > -180): [NEAR_ANGLE] = [NEAR_ANGLE] +360 return [NEAR_ …

There is no ArcPy function named GetParameterAsFloat. You will need to use arcpy.GetParameterAsText() (or possibly arcpy.GetParameter()). Using print() statements to show what values have been passe …

Your Python code seems valid because when I run: def AutoSchluessel(gmk, zae, nen): return "{}0{}{}".format(gmk, str(zae).rjust(7,"0"), str(nen).rjust(5,"0")) gmk = 5902 zae = 32 nen = 17 fl …

I do not think you will find a way to do this because there is an existing, not yet Under Consideration, ArcGIS Idea to have the 'Field Calculator default to Python'.

In the attribute table of my file geodatabase feature class I have a populated field called DateField of type date, and a text field called TextField. I have not yet hit on a way to convert the dat …

On a question such as this, where you have described what appears to be a reproducible bug, and has been verified by another member of our community, I think the best way forward is to log it with Esr …

I think the easiest way to learn "how to use ArcPy to run a field calculation" is to: Go to the Search window and find the Calculate Field tool Open its tool dialog Configure a test calculation and …

As commented by @FelixIP this can be done in: VB syntax mid(field,16,3) and as commented by @faith_dur: it is much nicer and versatile in Python, i.e. field [16:19]

You seem to know how to do this in the ArcGIS Field Calculator. Instead, do exactly the same thing using the Calculate Field tool, taking care to set your parser to Python. Once you have run the too …

I think the cause of this, and the reason you are also having trouble formatting this correctly in the question, is that there is a colon missing after else. Try this: def reclass(a): if (a <= 5 …