Replace character from attributes

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04-27-2017 03:02 PM
CCWeedcontrol
Regular Contributor

I need to remove forward slashes from the attributes in a layer. I need to remove the first \ and last \ and replace the double \\ with just one \. I would appreciate any help. Thanks.

Currently the attributes looks like this.

\R2\\M1\

\M1\\M1\\C2\

\AG\\R2\\M1\\R2\

I need it to look like the following

R2\M1

M1\M1\C2

AG\R2\M1\R2

I tried the following but got error "TypeError: argument of type 'NoneType' is not iterable" on line if '\\' if '\\' in row[0]: #if a double quote is in the string returned.

with arcpy.da.UpdateCursor("In_memory\LayerTest", "ZONING_CODE") as cursor:
    for row in cursor:
         if '\\' in row[0]: #if a double quote is in the string returned,  
            row[0]=row[0].replace('\\','\\') #replace that double quote with an empty string (removes it)  
            cursor.updateRow(row)
    del row
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1 Solution

Accepted Solutions
JoshuaBixby
MVP Esteemed Contributor

Does the following do what you want:

with arcpy.da.UpdateCursor("In_memory\LayerTest", "ZONING_CODE") as cursor:
    for code, in cursor:
        if code:
            cursor.updateRow([code.strip("\\").replace("\\\\","\\")])

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14 Replies
DanPatterson_Retired
MVP Esteemed Contributor

throw a print statement in between line 2 and 3... it appears that 'None' (aka a null) is being returned for row[0].

Also in python ...

a = "\\"
a.replace("\\", "")

a = "\\\\"
a.replace("\\\\", "\\")
Out[16]: '\\'
CCWeedcontrol
Regular Contributor

I put a print row in between lines 2 & 3.

with arcpy.da.UpdateCursor(ZT1, "ZONING_CODE") as cursor:
    for row in cursor:
        print row
        if '\\\\' in row[0]: #if a double quote is in the string returned,  
            row[0]=row[0].replace('\\\\','\\') #replace that double quote with an empty string (removes it)  
            cursor.updateRow(row)
    del row

I get alot of

[u'\\AG\\']
[u'\\AG\\\\C1\\']

[u'\\R1\\']

[u'\\RR\\']
[u'\\AG\\\\RR\\']
[u'\\AG\\']
[u'\\AG\\\\RR\\']
[u'\\CR-M1\\']

Traceback (most recent call last):
  File "C:\GIS\Python\ParcelTool\SpatialJoinTest.py", line 4, in <module>
    if '\\\\' in row[0]: #if a double quote is in the string returned,
TypeError: argument of type 'NoneType' is not iterable

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NeilAyres
MVP Frequent Contributor

Yes a Null is being returned.

You may want to wrap another if around the row[0] checking.

if row[0] or len(row[0]) > 0:
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CCWeedcontrol
Regular Contributor

do you mean an elif, i am not sure i am understand how to wrap another if around the row[0]

with arcpy.da.UpdateCursor(ZT1, "ZONING_CODE") as cursor:
    for row in cursor:
        if '\\\\' in row[0]: #if a double quote is in the string returned,
            if row[0] or len(row[0]) > 0:
                row[0]=row[0].replace('\\\\','\\') #replace that double quote with an empty string (removes it)
        
            
            cursor.updateRow(row)
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CCWeedcontrol
Regular Contributor

I was able to remove the double "\\" from within attributes . It didn't how ever remove the \ in the begging or the end. I would appreciate any help please.

\R2\\M1\ ----> \R2\M1\

\M1\\M1\\C2\ -----> \M1\M1\C2\

\AG\\R2\\M1\\R2\ -----> \AG\R2\M1\R2\

Current Code

with arcpy.da.UpdateCursor("In_memory\LayerTest", "ZONING_CODE") as cursor:
    for row in cursor:
        #print row
        #if row[0] or len(row[0]) > 0:
        if "\\\\" in row[0]: #if a double quote is in the string returned,
            for row in cursor:
                if row[0] or row[0] > 0:
                    row[0]=row[0].replace("\\\\","\\") #replace that double quote with an empty string (removes it)  
                    cursor.updateRow(row)
    del row
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DanPatterson_Retired
MVP Esteemed Contributor

you could slice before you update as in this example

row0 = 'abcdef'

row0 = row0[1:-1]

row0

'bcde'
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CCWeedcontrol
Regular Contributor

apologies for my slowness. I tried the following  but got error on line 7.

cursor.updateRow([row[0][1:-1]])
TypeError: 'NoneType' object has no attribute '__getitem__'

ZT1 = "In_memory\ZoningTest1"
arcpy.MakeFeatureLayer_management("In_memory\ZoningTest", ZT1)

with arcpy.da.UpdateCursor(ZT1, "ZONING_CODE") as cursor:
    for row in cursor:
        print row
        cursor.updateRow([row[0][1:-1]])
    del row
   

with arcpy.da.UpdateCursor(ZT1, "ZONING_CODE") as cursor:
    for row in cursor:
        #print row
        #if row[0] or len(row[0]) > 0:
        if "\\\\" in row[0]: #if a double quote is in the string returned,
            for row in cursor:
                if row[0] or row[0] > 0:
                    row[0]=row[0].replace("\\\\","\\") #replace that double quote with an empty string (removes it)
                    cursor.updateRow(row)
    del row
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DanPatterson_Retired
MVP Esteemed Contributor

I have no clue why you have to two cursors going on.

Presumably in and around line 17, row[0] is returning a string, which you then use the replace thing to get rid of the double quotes, which you then reassign back to row[0].  In line 17, why don't you call it 'val', so

val = row[0].replace(blah blah)

row[0] = val[1:-1]

cursor.updateRow(row)

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CCWeedcontrol
Regular Contributor

looks like it kind of worked....? it removed some of the \ but not all. See attached pic

with arcpy.da.UpdateCursor(ZT1, "ZONING_CODE") as cursor:
    for row in cursor:
        #print row
        #if row[0] or len(row[0]) > 0:
        if "\\\\" in row[0]: #if a double quote is in the string returned,
            for row in cursor:
                if row[0] or row[0] > 0:
                    val = row[0].replace("\\\\","\\") #replace that double quote with an empty string (removes it)
                    row[0]=val[1:-1]
                    cursor.updateRow(row)
    del row‍‍‍‍‍‍‍‍‍‍‍
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