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Python Novice Question - Get a list of files in a directory with particular extension

SheriNorton

I need to generate a list of all files in a directory with a *.MDB extension (personal geodatabases) in a Python script. Should I first split the path and filenames:

dirname = "C:\Arcwork"
(filepath, filename) = os.path.split(dirname)

and then somehow split the filename into name and extension (how?!), or vice versa?

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ChrisMathers

I would:

dirlist=os.listdir(r"C:\Arcwork")
mdblist=[]
for item in dirlist:
    if item[-3:] in ['MDB','mdb']
        mdblist.append(item)

its kind of wordy and a bit brute-force but it works 😛

SheriNorton

Thanks - tried this but validation returns a syntax error.

BBicking1

Thanks - tried this but validation returns a syntax error.

Hi...

MBldr's Iterate Files [ArcGIS10] with File Extension set to .mdb will do what you want. Connect the Collect Values ModelOnly Tool to the iterator's output to get the list. Note though at this time the list is not export-able or save-able.

Barbara Bicking
GeoprocessingTeam

ListMDBsInFolder_20Aug10.png

SheriNorton

I've tweaked the code:

import os

dirlist=os.listdir("c:\\Arcwork")
mdblist=[]
for item in dirlist:
    if item.endswith("mdb"):
        print item
        mdblist.append[item]

print mdblist
_____________________________
But I get this error: do I need to import another module to use the "Append'?
Traceback (most recent call last):
File "C:\Python26\ArcGIS10.0\Lib\site-packages\Pythonwin\pywin\framework\scriptutils.py", line 325, in RunScript
    exec codeObject in __main__.__dict__
File "C:\Arcwork\GetMasterMDBList.py", line 8, in <module>
    mdblist.append[item]
TypeError: 'builtin_function_or_method' object is unsubscriptable

DanPatterson_Retired

append uses round brackets

>>> a_list = []
>>> for i in [1,2,3,4]:
...  a_list.append(i)
...  
>>> print a_list
[1, 2, 3, 4]
>>>

KarlOrmer

You want to call a method. You call objects by using round brackets.

clm42's snippet misses a `:` at the end of line 4.

Please note that Python is case-sensitive. Your attempt will fail if a file is - for whatever reason - called .MDB, .mDb or .mDB.

>>> a = 'test.MDB'
>>> a.endswith('mdb')
False

Therefore you need to "convert" your item variable to lower-case before testing for 'mdb'

>>> a = 'test.MDB'
>>> a.lower()
'test.mdb'
>>> a.lower().endswith('mdb')
True

This adds up to:

dirlist=os.listdir("c:\\Arcwork")
mdblist=[]
for item in dirlist:
    if item.lower().endswith("mdb"):
        print item
        mdblist.append(item)

print mdblist

SheriNorton

Presto!!! Thanks so much to you all.

) I promise to be on the "giving" side down the road... Have a terrific weekend.

-Sheri

Luke_Pinner

Better late than never 🙂

import glob
for mdb in glob.glob('c:\\Arcwork\\*.mdb'):
    print mdb

The above snippet will return *.mdb and *.MDB (and *.MdB etc.) on case-insensitive filesystems, such as Windows.
For maximum portability, use something like:

for mdb in glob.glob(os.path.join(searchdir,*.[mM][dD][bB]')):
    print mdb

SheriNorton

Neat - thanks Luke! Sounds like this should work for Windows as well as Unix platform? I'll give a shot this morning. It's good to see there's usually more than one way of "skinning the cat".

Luke_Pinner

Both code snippets will work on Windows and unix/linux, but the top one will only return *.mdb (not *.MDB/*.MdB/etc...) on unix/linux as those OSs have case-sensitive file systems (generally speaking, as there are case-insensitive types of filesystems for linux and you can enable case-sensivity for certain Windows filesystems).

TedCronin

There is also a new List at ArcGIS 10 called ListFiles, arcpy.ListFiles ("*.mdb").

DanielSmith

i like using:

for root, dirs, files in os.walk(r'your root directory'):

that way you can access directories and files independently.

NiklasNorrthon

Here are two more ways to do this:

import os
personal_gdbs = [file for file in os.listdir('c:/Arcwork' if file.lower().endswith('.mdb')]

or

import arcpy
arcpy.env.workspace = 'c:/Arcwork'
personal_gdbs = arcpy.ListWorkspaces('*.mdb')

HugoAhlenius

import os
personal_gdbs = [file for file in os.listdir('c:/Arcwork') if file.lower().endswith('.mdb')]

To me, this looks like cleanest!
(I corrected a paranthesis in the snippet)

TedCronin

This is a great thread.

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