topic Re: Python Help in Python Questions

Python Help

DavidLeslie — Wed, 10 Dec 2014 16:22:08 GMT

Is there a way I can create a list of only the deletable fields in a feature class (and by deletable I mean fields other than OBJECTID, Shape, etc . I tried using arcpy.ListFields(), but it list all of the feilds.

Re: Python Help

DavidBlanchard — Wed, 10 Dec 2014 16:47:05 GMT

You will have to filter your list of fields produced by arcpy.ListFields() using the properties of the Field object. If you need help on filtering your list, the Dive Into Python guide has an excellent chapter on this: 4.5. Filtering Lists.

Re: Python Help

DanPatterson_Retired — Sun, 12 Dec 2021 00:04:17 GMT

like this...

>>> import arcpy
>>> shp_file = "c:/temp/x.shp"
>>> flds = arcpy.ListFields(shp_file)
>>>
>>> req_flds = [ [fld.required, fld.name] for fld in flds]
>>> req_flds
[[True, u'FID'], [True, u'Shape'], [False, u'Id'], [False, u'X'], [False, u'Y'], [False, u'Label']]
>>>

Re: Python Help

DavidLeslie — Wed, 10 Dec 2014 17:11:07 GMT

Thanks for your quick reply! From your post, I realized that I could use the editable method to check to see if a field can be deleted or not!

Re: Python Help

DanPatterson_Retired — Wed, 10 Dec 2014 17:18:51 GMT

just be aware of the subtle difference between editable and required

...

Editable fields:

[[False, u'FID'], [True, u'Shape'], [True, u'Id'], [True, u'X'], [True, u'Y'], [True, u'Label']]

Required fields:

[[True, u'FID'], [True, u'Shape'], [False, u'Id'], [False, u'X'], [False, u'Y'], [False, u'Label']]

...

Re: Python Help

DavidLeslie — Sun, 12 Dec 2021 00:04:19 GMT

I just used:

for i in range(len(parcelFieldList)):
     if parcelFieldList.editable:
          parcelFieldNames.append(str(parcelFieldList.name))

Re: Python Help

curtvprice — Fri, 12 Dec 2014 08:19:35 GMT

List comprehensions are just so elegant.

efields = [f.name for f in arcpy.ListFields(table) if f.editable]