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arcpy.AddMessage does not produce newlines in ArcGIS Pro?

GB_MattPanunto_GISS

I am working with ArcGIS Pro v2.4.1, and am trying to produce newlines using arcpy.AddMessage when running a script tool. I just want to create some blank spaces between messages, but none of the following seem to work when running the tool in ArcGIS Pro:

arcpy.AddMessage("\n")

arcpy.AddMessage("")

arcpy.AddMessage(" ")

However, these do work when running the tool in ArcMap. Is there a reason why these might not work in ArcGIS Pro?

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Accepted answers

JoshuaBixby

To make it work in both ArcMap and Pro, just make it a Unicode literal:

arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN>u<SPAN class="string token">"\u200B"</SPAN><SPAN class="punctuation token">)</SPAN> ‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

All comments

FC_Basson

I think it is getting ignored or "trimmed".

I tested this code

<SPAN class="keyword token">import</SPAN> arcpy
arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"first line"</SPAN><SPAN class="punctuation token">)</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"\n "</SPAN><SPAN class="punctuation token">)</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">".\n"</SPAN><SPAN class="punctuation token">)</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"."</SPAN><SPAN class="punctuation token">)</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"second line"</SPAN><SPAN class="punctuation token">)</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"first line\nsecond line"</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>

and got this output

So you might need to use an additional character to create a spacing between output lines.

JoshuaBixby

I see the same thing as FC Basson‌ with Pro 2.5. Personally, I would consider this a defect on Esri's part, but maybe they would consider it an 'enhancement' with Pro!

I tested a few white-space and control characters and all were getting stripped, but I did find that a zero-width space ('\u200B') works.

GB_MattPanunto_GISS

Good find! The '\u200B' seems to be working for me as well, but only for ArcGIS Pro, not ArcMap, ugh.

I guess inserting this line will provide a space in both environments:

arcpy.AddMessage("\u200B" if (sys.version_info[0] == 3) else "\n")

JoshuaBixby

To make it work in both ArcMap and Pro, just make it a Unicode literal:

arcpy<SPAN class="punctuation token">.</SPAN>AddMessage<SPAN class="punctuation token">(</SPAN>u<SPAN class="string token">"\u200B"</SPAN><SPAN class="punctuation token">)</SPAN> ‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

GB_MattPanunto_GISS

Ahh yes, perfect!

MikeVolz

Nice find Joshua!!!

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