topic Re: arcpy.Exists fails in Python Questions

arcpy.Exists fails

KennethKirkeby — Fri, 29 Jan 2016 15:44:49 GMT

ArcGIS 10.3.1; Python 2.7.11

The file DOES exist but reporting that it does not. The syntax looks correct to my newbie eyes.

******************************************************************************************************************

import arcpy

arcpy.env.workspace = "C:\\Users\\kkirkeby\\Desktop\\GIS-4080\\Lesson4_Data\\Lesson4_Data"

#Variables

out_folder_path = 'C:\\Users\\kkirkeby\\Desktop\\GIS-4080\\Lesson4_Data\\Lesson4_Data'

gdb_name = 'L4E5'

gdb_fullPath = out_folder_path +'/' + gdb_name

fclist = arcpy.ListFeatureClasses()

fcIn = 0

fcOut = 0

# Create gdb if it doesn't exist.

if arcpy.Exists(gdb_fullPath):

print "Geodatabase already exist"

else:

print "Geodatabase does not exist. Creating..."

print arcpy.Exists(gdb_fullPath)

print gdb_fullPath

# arcpy.CreateFileGDB_management(out_folder_path, gdb_name)

******************************************************************************************************************

Output:

================================ RESTART ================================

Geodatabase does not exist. Creating...

False

C:\Users\kkirkeby\Desktop\GIS-4080\Lesson4_Data\Lesson4_Data/L4E5

Re: arcpy.Exists fails

DanPatterson_Retired — Sun, 12 Dec 2021 01:24:07 GMT

can you try concatenating your file with "\\" instead of "/" the inconsistency in the final version may be confusing

not specific to gdb's but

Filenames and file paths in Python

example

>>> f = "file"
>>> path = r"c:\temp\text.gdb"
>>> full = path+ "\" + f
  File "<string>", line 1
    full = path+ "\" + f
                       ^
SyntaxError: EOL while scanning string literal
>>> full = path+ "\\" + f
>>> full
'c:\\temp\\text.gdb\\file'

>>> full
'c:\\temp\\text.gdb/file'
# works but may be confusing

Re: arcpy.Exists fails

JamesCrandall — Sun, 12 Dec 2021 01:24:10 GMT

You can try:

gdb_name = 'L4E5.gdb'
gdb_fullPath = out_folder_path +'\' + gdb_name

Although I typically would construct strings a bit differently using the 'r' literal:

out_folder_path = r'C:\Users\kkirkeby\Desktop\GIS-4080\Lesson4_Data\Lesson4_Data'
gdb_name = 'L4E5.gdb'
gdb_fullPath = out_folder_path +'\' + gdb_name

Re: arcpy.Exists fails

KennethKirkeby — Fri, 29 Jan 2016 16:34:53 GMT

Same result:

Also change

gdb_fullPath = out_folder_path +'\\' + gdb_name

print out_folder_path = C:\Users\kkirkeby\Desktop\GIS-4080\Lesson4_Data\Lesson4_Data

print gdb_name = l4_ex5

print gdb_fullPath = C:\Users\kkirkeby\Desktop\GIS-4080\Lesson4_Data\Lesson4_Data\l4_ex5

print arcpy.Exists(gdb_fullPath) = False

Re: arcpy.Exists fails

KennethKirkeby — Fri, 29 Jan 2016 16:35:12 GMT

Same result.

Re: arcpy.Exists fails

JamesCrandall — Fri, 29 Jan 2016 16:39:21 GMT

This:

C:\Users\kkirkeby\Desktop\GIS-4080\Lesson4_Data\Lesson4_Data\l4_ex5

Is not a geodatabase/workspace. You are missing the ".gdb" at the end.

C:\Users\kkirkeby\Desktop\GIS-4080\Lesson4_Data\Lesson4_Data\l4_ex5.gdb

Re: arcpy.Exists fails

KennethKirkeby — Fri, 29 Jan 2016 16:43:28 GMT

Well there's 4 hours I'll never get back ...

Thanks. Details, details, details.

Re: arcpy.Exists fails

DanPatterson_Retired — Fri, 29 Jan 2016 16:48:37 GMT

You will regain it in the future since you will not likely make that mistake again... Now if we could get people to quit using paths with spaces in them...

Re: arcpy.Exists fails

KennethKirkeby — Fri, 29 Jan 2016 17:01:20 GMT

I had read the link you listed before and thought I was good. I like your comment about using os.path instead.

Thanks for all your help to date.

Ken