If/Else do nothing

City_of_Greenville__SCGIS

I'm trying to write a simple if/else statement where if the value isn't found, Arcmap keeps the current field value.  I've tried using the default python command of pass but it still overwrites the values to null.  Any advice?  Code from codeblock below.

def reclass(mystring):
      if (mystring == 'C-4'):
           return 'Central Business District'

      else:

           pass

Scott

bixb0012

The better way is to pass both fields to the function:

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">reclass</SPAN><SPAN class="punctuation token">(</SPAN>f1<SPAN class="punctuation token">,</SPAN> f2<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>f1 <SPAN class="operator token">==</SPAN> <SPAN class="string token">'C-4'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> <SPAN class="string token">'Central Business District'</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> f2<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

and call it using:

reclass<SPAN class="punctuation token">(</SPAN>!field1!<SPAN class="punctuation token">,</SPAN> !field2!<SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>