What does “del aprx” at the end of Python code do?

aprxarcgis-proarcpyfor loop

Often times a Python code for ArcGIS Pro requires the statement "del aprx" at the very end, what does this statement do and is it necessary?

I recently ran a Python snippet changing data sources for a list of feature classes. Absentmindedly, I didn't include "del aprx" at the end, and the snippet ran successfully, but program froze afterward.

Could the freeze be related to my omission of "del aprx"?

Best Answer

In Python del means delete the object which would release memory and file locks. So if you saw del abc,bob,x this would mean delete the objects abc, bob and x, what ever they are. aprx is the commonly used name for an ArcGIS Pro project object but the coder could have called it anything like banana, but obviously that's a stupid name for the object it represents.

Without seeing the code and the context the object aprx is used no one can comment other than to say the coder was proactively releasing memory by deleting unwanted objects.

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Writing Python script to batch import .mxd to .aprx

Try changing where you've set the APRX variable. You'll see I moved the creation of it into your loop, at the same time you're importing into it and saving it. As your code is, it will probably append every single MXD it finds into the single existing variable you have (as you never clear it out). So the first run will save an .aprx with 1 imported MXD, the next .aprx will have the first and second, and so-on.

import os
import pathlib
import arcpy

ogDir = input('Directory to search for .mxds: ')
dirContents = os.listdir(ogDir)

for folder_path, subfolders, filenames in os.walk(ogDir):
    for file in filenames:
        if file[-4:] == '.mxd':
            aprx = arcpy.mp.ArcGISProject(r'C:\Users\M\Documents\mxd_test\blank\blank.aprx')
            filePath = pathlib.Path(folder_path) / file
            mxd = file[:-4]
            aprx.importDocument(filePath)
            aprx.saveACopy(folder_path + '\\' + mxd + '.aprx')

Best Answer

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