topic Re: python challenged in Geoprocessing Questions

python challenged

CariRuffino — Fri, 14 May 2010 17:58:57 GMT

I have about 7000 feature classes in a file geodatabase that need name ( need to remove 7 characters ) changes but I am rather clueless when it comes to code and am at a loss as to which tool I would use and what arguments I would need to use. Is there a anyone that can help?

example of the needed changes

*current features
adl390012_ll_Blk

*what I need the feature names to read
adl390012

Re: python challenged

JoelCalhoun — Sat, 11 Dec 2021 21:19:42 GMT

If you need to remove exactly 7 characters from the end of every featue class you can try this.

import arcgisscripting, os
gp = arcgisscripting.create(9.3)

gp.AddToolbox("C:/Program Files/ArcGIS/ArcToolbox/Toolboxes/Data Management Tools.tbx")

gp.workspace = "X:\\assr\\carto\\process_temp\\Demo_data.gdb"     # Path to your file geodatabase

# Get a list of feature classes in the workspace.
fcs = gp.ListFeatureClasses()

for fc in fcs:                           
    str_length = len(fc)              # Get the length of the feature class name string
    new_str_len = str_length - 7      # Get the length minus the last 7 characters
    new_fc = fc[0:new_str_len]        # Builds the new string to the new length
    gp.rename_management(fc, new_fc)  # Rename the feature class

I hope that helps,

Joel

Re: python challenged

LukePinner — Sat, 11 Dec 2021 21:19:45 GMT

Or this

import arcgisscripting, os
gp = arcgisscripting.create(9.3)

gp.AddToolbox("C:/Program Files/ArcGIS/ArcToolbox/Toolboxes/Data Management Tools.tbx")
gp.workspace = "C:\\path_to_your\\geodatabase.gdb"

# Get a list of feature classes in the workspace.
fcs = gp.ListFeatureClasses()

for fc in fcs:                           
    gp.rename_management(fc, fc[:-7])

Re: python challenged

CariRuffino — Wed, 19 May 2010 14:45:03 GMT

For the first suggested code I recieve an error message that reads:PythonWin 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit (Intel)] on win32.
Portions Copyright 1994-2006 Mark Hammond - see 'Help/About PythonWin' for further copyright information.
Traceback (most recent call last):
File "C:\Python25\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py", line 310, in RunScript
    exec codeObject in __main__.__dict__
File "C:\Documents and Settings\ceruffino\Desktop\scripts\name.py", line 15, in <module>
    gp.rename_management(fc, new_fc) # Rename the feature class
ExecuteError: Failed to execute. Parameters are not valid.
ERROR 000735: Output data element: Value is required
Failed to execute (Rename).

For the second suggested code I recieve this error message
File "C:\Python25\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py", line 310, in RunScript
    exec codeObject in __main__.__dict__
File "C:\Documents and Settings\ceruffino\Desktop\scripts\name.py", line 12, in <module>
    gp.rename_management(fc,fc[:-7])
ExecuteError: Failed to execute. Parameters are not valid.
ERROR 000735: Output data element: Value is required
Failed to execute (Rename).

I unfortunately am not yet skilled enough in Python to figure this out on my own . Any suggestions are welcome. ~Cari

Re: python challenged

JoelCalhoun — Wed, 19 May 2010 16:11:31 GMT

Can you post the exact code you used? It seems that in both cases it is not reading an output value for the rename operation.

Joel

Re: python challenged

CariRuffino — Wed, 19 May 2010 17:00:12 GMT

Here is the first code

import arcgisscripting, os
gp = arcgisscripting.create(9.3)

gp.AddToolbox("C:/Program Files/ArcGIS/ArcToolbox/Toolboxes/Data Management Tools.tbx")

gp.workspace = "C:\\Documents and Settings\\ceruffino\\Desktop\\Closed State Leases\\Closed State Leases.gdb"     # Path to your file geodatabase

# Get a list of feature classes in the workspace.
fcs = gp.ListFeatureClasses()

for fc in fcs:
    str_length =len(fc)
    new_str_len=str_length -7
    new_fc =fc[0:new_str_len]
    gp.rename_management(fc,new_fc)

Re: python challenged

RDHarles — Sat, 11 Dec 2021 21:19:49 GMT

Your code works. The only thing I changed to test it was the path to the FGDB. I have to assume the path is incorrect in some way.

import arcgisscripting, os
gp = arcgisscripting.create(9.3)

gp.AddToolbox("C:/Program Files/ArcGIS/ArcToolbox/Toolboxes/Data Management Tools.tbx")

gp.workspace = "C:\\junk\\temp.gdb" # Path to your file geodatabase

# Get a list of feature classes in the workspace.
fcs = gp.ListFeatureClasses()

for fc in fcs:                           
    str_length =len(fc)
    new_str_len=str_length -7
    new_fc =fc[0:new_str_len]
    gp.rename_management(fc,new_fc)

Re: python challenged

JoelCalhoun — Wed, 19 May 2010 18:38:19 GMT

Out of curiosity, are you using ArcGIS 9.3.1? or are you still using ArcGIS 9.2?

If you are still on ArcGIS 9.2 you cannot use the 9.3 geoprocessor object:
gp = arcgisscripting.create(9.3) would have to be gp = arcgisscripting.create() at 9.2.

ESRI also changed the way the gp.ListFeatureClasses works between those two releases.
At 9.2 it would return an enumeration object but at 9.3 it returns a Python List.
This changes the way you loop through the feature classes.

Also I would recommend against using spaces in filepaths.
I think ESRI has a validation tool but an easier solution would be moving your folder and gdb to C: and using underscores.

See example below:

gp.workspace = "C:\\Closed_State_Leases\\Closed_State _Leases.gdb"

I don't know if any of those will solve your problem but I hope you can get it figured out.

Joel

Re: python challenged

CariRuffino — Wed, 19 May 2010 21:03:10 GMT

I am not sure what happened. I know that certain characters in the string were removed but it was not actually -7 it was -5. I tried putting the gdb directly on the C and replaced spaces with underscores but that also proved to be unsuccessful. I currently am using ArcInfo 9.3.1 so that shouldn't be an issue. I'm sure it's some tiny detail that's stalling my progress but I can't seem to get around it.