Advanced label expression by arcpy

calgis

I would like to use arcpy to add a specific layer in mxd and automatically label the feature with different colors according to its attributes.

Even if I use the simple syntax lblClass.expression = "Function FindLabel ( [OBJECTID] ) FindLabel = [OBJECTID] End Function", label also cannot be shown. I search some papers about this and found that it may caused by "Advanced" setting on label expression. However, my layer is dynamically added in mxd but not pre-loaded in mxd.

Does anyone know,

1)  Can I label the feature with different colors according to its attributes if i don't turn on "Advanced" setting on label expression (dont use If-then)?

2)  How can I turn on the "Advanced" label expression by using arcpy? As I know, there is no property of labelClass to turn on the "Advanced" mode. Any other alternative methods to do so? I tried to use arcpy.mapping.UpdateLayer but "Advanced" label expression can not be updated by other layers which have set the "Advanced" option.

Thanks.

RandyBurton

There are no properties documented to select the advanced option or parser for the LabelClass.  You can use some Formatting tags in your labels to display color.

You might use the Field Calculator to populate a second label field with text that includes color tags, such as:

<SPAN class="comment token"># code block</SPAN>
<SPAN class="keyword token">def</SPAN> <SPAN class="token function">colorLabel</SPAN><SPAN class="punctuation token">(</SPAN>attrib<SPAN class="punctuation token">,</SPAN> label<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> attrib <SPAN class="operator token">==</SPAN> <SPAN class="number token">1</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'<CLR red = "255">{}</CLR>'</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>label<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">elif</SPAN> attrib <SPAN class="operator token">==</SPAN> <SPAN class="number token">2</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'<CLR blue = "255">{}</CLR>'</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>label<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">elif</SPAN> attrib <SPAN class="operator token">==</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'<CLR red = "255" green = "255">{}</CLR>'</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>label<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> label

<SPAN class="comment token"># expression</SPAN>
colorLabel<SPAN class="punctuation token">(</SPAN>!AttributeField!<SPAN class="punctuation token">,</SPAN> !LabelField!<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>