topic Re: 'Is Null' in Python in Python Questions https://community.esri.com/t5/python-questions/is-null-in-python/m-p/63772#M5175 <HTML><HEAD></HEAD><BODY><P><A href="http://support.esri.com/cn/knowledgebase/techarticles/detail/40913">Try this</A></P></BODY></HTML> Wed, 13 Aug 2014 17:19:11 GMT DanPatterson_Retired 2014-08-13T17:19:11Z 'Is Null' in Python https://community.esri.com/t5/python-questions/is-null-in-python/m-p/63771#M5174 <HTML><HEAD></HEAD><BODY><P>I am trying to use field calculator where values will be taken from one field of two fields with if condition. If first field is null then value will be taken from second field. In VB there is 'is Null' keyword. What is there in Python?</P></BODY></HTML> Wed, 13 Aug 2014 16:59:44 GMT https://community.esri.com/t5/python-questions/is-null-in-python/m-p/63771#M5174 HemantAngarkar2 2014-08-13T16:59:44Z Re: 'Is Null' in Python https://community.esri.com/t5/python-questions/is-null-in-python/m-p/63772#M5175 <HTML><HEAD></HEAD><BODY><P><A href="http://support.esri.com/cn/knowledgebase/techarticles/detail/40913">Try this</A></P></BODY></HTML> Wed, 13 Aug 2014 17:19:11 GMT https://community.esri.com/t5/python-questions/is-null-in-python/m-p/63772#M5175 DanPatterson_Retired 2014-08-13T17:19:11Z Re: 'Is Null' in Python https://community.esri.com/t5/python-questions/is-null-in-python/m-p/63773#M5176 <HTML><HEAD></HEAD><BODY><P>You can use</P><P></P><PRE __default_attr="python" __jive_macro_name="code" class="jive_macro_code _jivemacro_uid_14079504055846601 jive_text_macro" jivemacro_uid="_14079504055846601"> <P>value is None</P> </PRE><P></P><P>For example, in your expression you can do</P><P></P><PRE __default_attr="python" __jive_macro_name="code" class="jive_macro_code _jivemacro_uid_14079504144919394 jive_text_macro" jivemacro_uid="_14079504144919394"> <P>!field1! if not !field1! is None else !field2!</P> </PRE><P></P><P>alternately just do</P><P></P><PRE __default_attr="python" __jive_macro_name="code" class="jive_macro_code _jivemacro_uid_14079504218426719 jive_text_macro" jivemacro_uid="_14079504218426719"> <P>!field1! or !field2!</P> </PRE></BODY></HTML> Wed, 13 Aug 2014 17:20:23 GMT https://community.esri.com/t5/python-questions/is-null-in-python/m-p/63773#M5176 JasonScheirer 2014-08-13T17:20:23Z Re: 'Is Null' in Python https://community.esri.com/t5/python-questions/is-null-in-python/m-p/63774#M5177 <HTML><HEAD></HEAD><BODY><P>Take a look at this thread</P><P></P><P><A href="http://gis.stackexchange.com/questions/13308/how-do-you-test-for-a-null-string-field-in-the-field-calculator-with-python" title="http://gis.stackexchange.com/questions/13308/how-do-you-test-for-a-null-string-field-in-the-field-calculator-with-python">arcgis 10.0 - How do you test for a NULL string field in the Field Calculator with Python? - Geographic Information Sys…</A>‌</P></BODY></HTML> Wed, 13 Aug 2014 17:22:32 GMT https://community.esri.com/t5/python-questions/is-null-in-python/m-p/63774#M5177 IanMurray 2014-08-13T17:22:32Z