I would like to divide a shp in about 20-50 adjacent polygons. I have the following script but the while loop (line 54) becomes endless if there are less than 10 adjacent polygons to select. Any ideas for a better solution? # -*- coding: cp1252 -*- import arcpy arcpy . env . overwriteOutput = True arcpy . env . workspace = "in_memory" Alk_Sel = r "R:\Daten\sgb_Planungen\2013\Saalbachniederung\Eigentuemer\ALK_merge_E.shp" alk_sel_Layer = "alk_sel_Layer" InFile = r "C:\temp2\InFile.shp" def SicFeature ( ) : arcpy . CopyFeatures_management ( Alk_Sel , InFile ) arcpy . MakeFeatureLayer_management ( InFile , alk_sel_Layer ) def AddField ( ) : arcpy . AddField_management ( alk_sel_Layer , "Round" , "LONG" ) def selectMin ( ) : sum = arcpy . GetCount_management ( alk_sel_Layer ) print sum i = 0 for i in range ( 1 , int ( sum . getOutput ( 0 ) ) , 10 ) : i += 1 Expression = """ "Round" = {} """ . format ( 0 ) arcpy . MakeFeatureLayer_management ( InFile , alk_sel_Layer , Expression ) sum1 = arcpy . GetCount_management ( alk_sel_Layer ) print ( '{} has a sum of {} records' . format ( alk_sel_Layer , sum1 [ 0 ] ) ) MyList = list ( ) cursor = arcpy . da . SearchCursor ( alk_sel_Layer , "FID" ) for row in cursor : MyList . append ( int ( row [ 0 ] ) ) print 'Minimum: {0}' . format ( min ( MyList ) ) expression1 = min ( MyList ) arcpy . SelectLayerByAttribute_management ( alk_sel_Layer , "NEW_SELECTION" , """ "FID" = {} """ . format ( expression1 ) ) result1 = arcpy . GetCount_management ( alk_sel_Layer ) while ( int ( result1 . getOutput ( 0 ) ) 10 ) : arcpy . SelectLayerByLocation_management ( alk_sel_Layer , "INTERSECT" , alk_sel_Layer ) result1 = arcpy . GetCount_management ( alk_sel_Layer ) print ( result1 ) arcpy . CalculateField_management ( alk_sel_Layer , "Round" , i ) OutFile = r "C:\temp2\OutFile_{}.shp" . format ( i ) arcpy . CopyFeatures_management ( alk_sel_Layer , OutFile ) SicFeature ( ) AddField ( ) selectMin ( )

while ( int ( result1 . getOutput ( 0 ) ) 10 ) : old_value = int ( result1 . getOutput ( 0 ) ) arcpy . SelectLayerByLocation_management ( alk_sel_Layer , "INTERSECT" , alk_sel_Layer ) result1 = arcpy . GetCount_management ( alk_sel_Layer ) print ( result1 ) if int ( result1 . getOutput ( 0 ) ) == old_value : break This was the solution for me.

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Divide shp in about 20-50 adjacent polygons?

JB1234510

I would like to divide a shp in about 20-50 adjacent polygons. I have the following script but the while loop (line 54) becomes endless if there are less than 10 adjacent polygons to select. Any ideas for a better solution?

<SPAN class="comment token"># -*- coding: cp1252 -*-</SPAN>

<SPAN class="keyword token">import</SPAN> arcpy

arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>overwriteOutput <SPAN class="operator token">=</SPAN> <SPAN class="token boolean">True</SPAN>

arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> <SPAN class="string token">"in_memory"</SPAN>

Alk_Sel <SPAN class="operator token">=</SPAN> r<SPAN class="string token">"R:\Daten\sgb_Planungen\2013\Saalbachniederung\Eigentuemer\ALK_merge_E.shp"</SPAN>
alk_sel_Layer <SPAN class="operator token">=</SPAN> <SPAN class="string token">"alk_sel_Layer"</SPAN>
InFile <SPAN class="operator token">=</SPAN> r<SPAN class="string token">"C:\temp2\InFile.shp"</SPAN>

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">SicFeature</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
    
    arcpy<SPAN class="punctuation token">.</SPAN>CopyFeatures_management<SPAN class="punctuation token">(</SPAN>Alk_Sel<SPAN class="punctuation token">,</SPAN> InFile<SPAN class="punctuation token">)</SPAN>
    arcpy<SPAN class="punctuation token">.</SPAN>MakeFeatureLayer_management<SPAN class="punctuation token">(</SPAN>InFile<SPAN class="punctuation token">,</SPAN> alk_sel_Layer<SPAN class="punctuation token">)</SPAN>

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">AddField</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

    arcpy<SPAN class="punctuation token">.</SPAN>AddField_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Round"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"LONG"</SPAN><SPAN class="punctuation token">)</SPAN>

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">selectMin</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

    sum <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetCount_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">)</SPAN>
    <SPAN class="keyword token">print</SPAN> sum

    i <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN>

    <SPAN class="keyword token">for</SPAN> i <SPAN class="keyword token">in</SPAN> range<SPAN class="punctuation token">(</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">,</SPAN> int<SPAN class="punctuation token">(</SPAN>sum<SPAN class="punctuation token">.</SPAN>getOutput<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">10</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

        i <SPAN class="operator token">+=</SPAN> <SPAN class="number token">1</SPAN>
    
        Expression <SPAN class="operator token">=</SPAN> <SPAN class="string token">""" "Round" = {} """</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN>
        
        arcpy<SPAN class="punctuation token">.</SPAN>MakeFeatureLayer_management<SPAN class="punctuation token">(</SPAN>InFile<SPAN class="punctuation token">,</SPAN> alk_sel_Layer<SPAN class="punctuation token">,</SPAN> Expression <SPAN class="punctuation token">)</SPAN>
        
        sum1 <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetCount_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">)</SPAN>
        <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">'{} has a sum of {} records'</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">,</SPAN> sum1<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>

        MyList <SPAN class="operator token">=</SPAN> list<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
        cursor <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"FID"</SPAN><SPAN class="punctuation token">)</SPAN>

        <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
            MyList<SPAN class="punctuation token">.</SPAN>append<SPAN class="punctuation token">(</SPAN>int<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>

        <SPAN class="keyword token">print</SPAN> <SPAN class="string token">'Minimum: {0}'</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>min<SPAN class="punctuation token">(</SPAN>MyList<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>

        expression1 <SPAN class="operator token">=</SPAN> min<SPAN class="punctuation token">(</SPAN>MyList<SPAN class="punctuation token">)</SPAN>

        arcpy<SPAN class="punctuation token">.</SPAN>SelectLayerByAttribute_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"NEW_SELECTION"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">""" "FID" = {} """</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>expression1<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
        
        result1 <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetCount_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">)</SPAN>
                    
        <SPAN class="keyword token">while</SPAN> <SPAN class="punctuation token">(</SPAN>int<SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">.</SPAN>getOutput<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token"><</SPAN> <SPAN class="number token">10</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
          
            arcpy<SPAN class="punctuation token">.</SPAN>SelectLayerByLocation_management <SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"INTERSECT"</SPAN><SPAN class="punctuation token">,</SPAN> alk_sel_Layer<SPAN class="punctuation token">)</SPAN>

            result1 <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetCount_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">)</SPAN>
            <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">)</SPAN>

        arcpy<SPAN class="punctuation token">.</SPAN>CalculateField_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Round"</SPAN><SPAN class="punctuation token">,</SPAN> i<SPAN class="punctuation token">)</SPAN>

        OutFile <SPAN class="operator token">=</SPAN> r<SPAN class="string token">"C:\temp2\OutFile_{}.shp"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>i<SPAN class="punctuation token">)</SPAN>
        arcpy<SPAN class="punctuation token">.</SPAN>CopyFeatures_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">,</SPAN> OutFile<SPAN class="punctuation token">)</SPAN>

SicFeature<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
AddField<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
selectMin<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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Accepted answers

JB1234510

<SPAN class="keyword token">while</SPAN> <SPAN class="punctuation token">(</SPAN>int<SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">.</SPAN>getOutput<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token"><</SPAN> <SPAN class="number token">10</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

            old_value <SPAN class="operator token">=</SPAN> int<SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">.</SPAN>getOutput<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
            
            arcpy<SPAN class="punctuation token">.</SPAN>SelectLayerByLocation_management <SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"INTERSECT"</SPAN><SPAN class="punctuation token">,</SPAN> alk_sel_Layer<SPAN class="punctuation token">)</SPAN>

            result1 <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetCount_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">)</SPAN>
            <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">)</SPAN>

            <SPAN class="keyword token">if</SPAN> int<SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">.</SPAN>getOutput<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">==</SPAN> old_value<SPAN class="punctuation token">:</SPAN>
                <SPAN class="keyword token">break</SPAN>‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

This was the solution for me.

All comments

NeilAyres

You generate a list of "i" in line 29, then in 31 you increment "i".

Then you only seem to use the value of "i" inside the while loop to identify the output.

Consider using 2 separate counters so you don't get confused and increment inside the while loop.

JB1234510

Thank you,

remains the question how to get out of the while loop if the result1 value didn't change.

JB1234510

<SPAN class="keyword token">while</SPAN> <SPAN class="punctuation token">(</SPAN>int<SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">.</SPAN>getOutput<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token"><</SPAN> <SPAN class="number token">10</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

            old_value <SPAN class="operator token">=</SPAN> int<SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">.</SPAN>getOutput<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
            
            arcpy<SPAN class="punctuation token">.</SPAN>SelectLayerByLocation_management <SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"INTERSECT"</SPAN><SPAN class="punctuation token">,</SPAN> alk_sel_Layer<SPAN class="punctuation token">)</SPAN>

            result1 <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>GetCount_management<SPAN class="punctuation token">(</SPAN>alk_sel_Layer<SPAN class="punctuation token">)</SPAN>
            <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">)</SPAN>

            <SPAN class="keyword token">if</SPAN> int<SPAN class="punctuation token">(</SPAN>result1<SPAN class="punctuation token">.</SPAN>getOutput<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">==</SPAN> old_value<SPAN class="punctuation token">:</SPAN>
                <SPAN class="keyword token">break</SPAN>‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

This was the solution for me.

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