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    <title>topic Optional parameters Modelbuilder bloc code in Python Questions</title>
    <link>https://community.esri.com/t5/python-questions/optional-parameters-modelbuilder-bloc-code/m-p/214999#M16581</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi!&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;I have created a&amp;nbsp;model to automate&amp;nbsp;a task&amp;nbsp;but having difficulty with my optional parameter (variable substitution) with bloc code of my field calculator tool. I want to calculate the field Restrictio only if the user type something in the text box otherwise just pass (keep the current value in the field). Here my model:&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;&lt;IMG alt="" class="image-1 jive-image" src="/legacyfs/online/385277_2017-11-30 09_20_21-Table.png" style="width: 768px; height: 590px;" /&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;The python script:&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;def UpdateField(value = "%ModRestric%"):&lt;BR /&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;if value !="":&lt;BR /&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;return value&lt;BR /&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;else:&lt;BR /&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;pass&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;Thanks for your help&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;Jonathan&lt;/SPAN&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Thu, 30 Nov 2017 14:48:04 GMT</pubDate>
    <dc:creator>JonathanGagnon1</dc:creator>
    <dc:date>2017-11-30T14:48:04Z</dc:date>
    <item>
      <title>Optional parameters Modelbuilder bloc code</title>
      <link>https://community.esri.com/t5/python-questions/optional-parameters-modelbuilder-bloc-code/m-p/214999#M16581</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi!&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;I have created a&amp;nbsp;model to automate&amp;nbsp;a task&amp;nbsp;but having difficulty with my optional parameter (variable substitution) with bloc code of my field calculator tool. I want to calculate the field Restrictio only if the user type something in the text box otherwise just pass (keep the current value in the field). Here my model:&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;&lt;IMG alt="" class="image-1 jive-image" src="/legacyfs/online/385277_2017-11-30 09_20_21-Table.png" style="width: 768px; height: 590px;" /&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;The python script:&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;def UpdateField(value = "%ModRestric%"):&lt;BR /&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;if value !="":&lt;BR /&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;return value&lt;BR /&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;else:&lt;BR /&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;pass&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;Thanks for your help&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="background-color: #ffffff;"&gt;Jonathan&lt;/SPAN&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 30 Nov 2017 14:48:04 GMT</pubDate>
      <guid>https://community.esri.com/t5/python-questions/optional-parameters-modelbuilder-bloc-code/m-p/214999#M16581</guid>
      <dc:creator>JonathanGagnon1</dc:creator>
      <dc:date>2017-11-30T14:48:04Z</dc:date>
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