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Error 000539: Error running expression. UnboundlocalError: local varialble 'Value' referenced before assignment

ChristaR

I am using the Calculate Field tool in model builder. I am new to Python, but modeled my code after something I had done in a previous model that worked well. Despite following similar syntax and rules, I am given an error message I don't recognize (see attachments). I’ve tried looking up similar issues and have not been able to find a solution. Current Depth contains numerical data.
Any insight would be appreciated.

Here is my code:

def assignValue(DWType, CurrentDepth):

if DWType == 'single':

Value = ((90 - CurrentDepth) / 90) * 100

if DWType == 'double':

Value = ((140 - CurrentDepth) / 140) * 100

if DWType == 'triple':

Value = ((190 - CurrentDepth) / 190) * 100

return Value

Codeblock:

assginValue( !DRYW_DEPTH!, !Cur_BotDep!)

Calculate Field Python Code.png

Calculate Field Error Message.png

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Accepted answers

DanPatterson_Retired

maybe you are missing a value, or one has an error in spelling, or a blank but assign a default value to check

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">assignValue</SPAN><SPAN class="punctuation token">(</SPAN>DWType<SPAN class="punctuation token">,</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
    Value <SPAN class="operator token">=</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">999</SPAN>  <SPAN class="comment token"># add this ad the top</SPAN>
    <SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

JoeBorgione

Not sure if this is it....

def assignValue(DWType, CurrentDepth):

versus

assginValue( !DRYW_DEPTH!, !Cur_BotDep!)

(Should have errored out...)

DanPatterson_Retired

DWType check the text case for that field since Single, single and SINGLE are all different.

You can alter your condition to check for leading trailing spaces as well as the case issue

lower(str(DWType).strip())

ChristaR

This applied all the values I had selected as -999, but no error message. So it seems like Joe said, none of my statements are being evaluated as true. So I suppose I will have to dig deeper there to figure out why. Thanks for the help!

JoeBorgione

Yep.... (I was typing my response as you posted yours; ironically we both chose -999 as the default value....)

DanPatterson_Retired

Joe, if you put that Value = -999 at the top as I suggested, it has the same result as your lines 16 and 17

JoeBorgione

I think what's going is none of your if statements are being evaluated to true, therefore when you try to return Value, it it has not been cast. Note your formatted script below and line 8 (the offending line from your error) supports my idea.

Check your math on one selected record and make sure it's good. In your model, are there any selections being made before you apply this calculation? Also are your sure the values of DWType are exactly as you show them? Remember, python is case sensitive. Finally as a matter of coding style I would not use individual if statements but rather if, elif as shown below your original code.

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">assignValue</SPAN><SPAN class="punctuation token">(</SPAN>DWType<SPAN class="punctuation token">,</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
   <SPAN class="keyword token">if</SPAN> DWType <SPAN class="operator token">==</SPAN> <SPAN class="string token">'single'</SPAN><SPAN class="punctuation token">:</SPAN>  
       Value <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">90</SPAN> <SPAN class="operator token">-</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">/</SPAN> <SPAN class="number token">90</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="number token">100</SPAN>
   <SPAN class="keyword token">if</SPAN> DWType <SPAN class="operator token">==</SPAN> <SPAN class="string token">'double'</SPAN><SPAN class="punctuation token">:</SPAN>  
       Value <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">140</SPAN> <SPAN class="operator token">-</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">/</SPAN> <SPAN class="number token">140</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="number token">100</SPAN>
   <SPAN class="keyword token">if</SPAN> DWType <SPAN class="operator token">==</SPAN> <SPAN class="string token">'triple'</SPAN><SPAN class="punctuation token">:</SPAN>  
       Value <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">190</SPAN> <SPAN class="operator token">-</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">/</SPAN> <SPAN class="number token">190</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="number token">100</SPAN>
   <SPAN class="keyword token">return</SPAN> Value‍‍‍‍‍‍‍‍

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">assignValue</SPAN><SPAN class="punctuation token">(</SPAN>DWType<SPAN class="punctuation token">,</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
   <SPAN class="keyword token">if</SPAN> DWType <SPAN class="operator token">==</SPAN> <SPAN class="string token">'single'</SPAN><SPAN class="punctuation token">:</SPAN>  
       Value <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">90</SPAN> <SPAN class="operator token">-</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">/</SPAN> <SPAN class="number token">90</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="number token">100</SPAN>
   <SPAN class="keyword token">elif</SPAN> DWType <SPAN class="operator token">==</SPAN> <SPAN class="string token">'double'</SPAN><SPAN class="punctuation token">:</SPAN>  
       Value <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">140</SPAN> <SPAN class="operator token">-</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">/</SPAN> <SPAN class="number token">140</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="number token">100</SPAN>
   <SPAN class="keyword token">elif</SPAN> DWType <SPAN class="operator token">==</SPAN> <SPAN class="string token">'triple'</SPAN><SPAN class="punctuation token">:</SPAN>  
       Value <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">190</SPAN> <SPAN class="operator token">-</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">/</SPAN> <SPAN class="number token">190</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="number token">100</SPAN>
   <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN>
       Value <SPAN class="operator token">=</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">999</SPAN>
   <SPAN class="keyword token">return</SPAN> Value‍‍‍‍‍‍‍‍<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>

DanPatterson_Retired

maybe you are missing a value, or one has an error in spelling, or a blank but assign a default value to check

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">assignValue</SPAN><SPAN class="punctuation token">(</SPAN>DWType<SPAN class="punctuation token">,</SPAN> CurrentDepth<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
    Value <SPAN class="operator token">=</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">999</SPAN>  <SPAN class="comment token"># add this ad the top</SPAN>
    <SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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