https://community.esri.com/t5/arcmap-questions/update-field-with-condition-not-working/m-p/1323184#M4540 <P>Hi,</P><P>I spent half day and didn't resolve issue. I need to update field Grave if it is null. My code is below. I am using python. I have attached error details. please help!</P><P><STRONG>Logic</STRONG></P><P>def myfun(myvalue):<BR />if myvalue != !ABC_ID!:<BR />return !ABC_NO!</P><P><STRONG>Field</STRONG></P><P>Grave=myfun(!H_No!)</P> Mon, 28 Aug 2023 20:40:06 GMT rajujee 2023-08-28T20:40:06Z https://community.esri.com/t5/arcmap-questions/update-field-with-condition-not-working/m-p/1323184#M4540 <P>Hi,</P><P>I spent half day and didn't resolve issue. I need to update field Grave if it is null. My code is below. I am using python. I have attached error details. please help!</P><P><STRONG>Logic</STRONG></P><P>def myfun(myvalue):<BR />if myvalue != !ABC_ID!:<BR />return !ABC_NO!</P><P><STRONG>Field</STRONG></P><P>Grave=myfun(!H_No!)</P> Mon, 28 Aug 2023 20:40:06 GMT https://community.esri.com/t5/arcmap-questions/update-field-with-condition-not-working/m-p/1323184#M4540 rajujee 2023-08-28T20:40:06Z https://community.esri.com/t5/arcmap-questions/update-field-with-condition-not-working/m-p/1323224#M4541 <P><A href="https://community.esri.com/t5/community-help-documents/how-to-insert-code-in-your-post/ta-p/914552" target="_self">How to insert code...</A>.</P><P>You didn't say what you&nbsp; want to update to if Null.&nbsp; So, this updates to the value in ABC_NO field.</P><LI-CODE lang="c">def myfun(myvalue,retvalue): if myvalue is None: return retvalue else: return myvalue Field Grave= myfun(!Grave!,!ABC_NO!)</LI-CODE><P>&nbsp;</P><P>R_</P> Mon, 28 Aug 2023 22:06:24 GMT https://community.esri.com/t5/arcmap-questions/update-field-with-condition-not-working/m-p/1323224#M4541 RhettZufelt 2023-08-28T22:06:24Z