topic Re: Null in python? in Python Questions https://community.esri.com/t5/python-questions/null-in-python/m-p/25203#M1902 <HTML><HEAD></HEAD><BODY><SPAN>Null What?</SPAN><BR /><BR /><SPAN>None should work for Null pointers&nbsp; </SPAN><BR /><BR /><SPAN>thing is an object.</SPAN><BR /><SPAN>if&nbsp; thing == None :</SPAN><BR /><BR /><BR /><BR /><SPAN>thing is a string</SPAN><BR /><SPAN>one thing about strings however is users sometimes put man blank charagers in a string. So it looks empty&nbsp; but "" will fail.&nbsp; So you need to check thing.len() == 0 first.</SPAN><BR /><SPAN>if thing == "":</SPAN></BODY></HTML> Fri, 15 Jun 2012 18:43:39 GMT WilliamIde 2012-06-15T18:43:39Z Null in python? https://community.esri.com/t5/python-questions/null-in-python/m-p/25200#M1899 <HTML><HEAD></HEAD><BODY><SPAN>What is the equivalent of "null" in python to clean the column in calculate field?</SPAN><BR /><SPAN>I try use "None" ,but without any effect.</SPAN></BODY></HTML> Fri, 15 Jun 2012 11:29:04 GMT https://community.esri.com/t5/python-questions/null-in-python/m-p/25200#M1899 BartłomiejStaroń 2012-06-15T11:29:04Z Re: Null in python? https://community.esri.com/t5/python-questions/null-in-python/m-p/25201#M1900 <HTML><HEAD></HEAD><BODY><SPAN>did you try two double quotes? ""</SPAN></BODY></HTML> Fri, 15 Jun 2012 11:48:08 GMT https://community.esri.com/t5/python-questions/null-in-python/m-p/25201#M1900 DanPatterson_Retired 2012-06-15T11:48:08Z Re: Null in python? https://community.esri.com/t5/python-questions/null-in-python/m-p/25202#M1901 <HTML><HEAD></HEAD><BODY><SPAN>None should not be in quotes.</SPAN></BODY></HTML> Fri, 15 Jun 2012 13:32:01 GMT https://community.esri.com/t5/python-questions/null-in-python/m-p/25202#M1901 ChrisBater 2012-06-15T13:32:01Z Re: Null in python? https://community.esri.com/t5/python-questions/null-in-python/m-p/25203#M1902 <HTML><HEAD></HEAD><BODY><SPAN>Null What?</SPAN><BR /><BR /><SPAN>None should work for Null pointers&nbsp; </SPAN><BR /><BR /><SPAN>thing is an object.</SPAN><BR /><SPAN>if&nbsp; thing == None :</SPAN><BR /><BR /><BR /><BR /><SPAN>thing is a string</SPAN><BR /><SPAN>one thing about strings however is users sometimes put man blank charagers in a string. So it looks empty&nbsp; but "" will fail.&nbsp; So you need to check thing.len() == 0 first.</SPAN><BR /><SPAN>if thing == "":</SPAN></BODY></HTML> Fri, 15 Jun 2012 18:43:39 GMT https://community.esri.com/t5/python-questions/null-in-python/m-p/25203#M1902 WilliamIde 2012-06-15T18:43:39Z Re: Null in python? https://community.esri.com/t5/python-questions/null-in-python/m-p/25204#M1903 <HTML><HEAD></HEAD><BODY><SPAN>check out this blog for dealing with null values&nbsp; when using field calculator:</SPAN><BR /><A href="http://blogs.esri.com/esri/arcgis/2010/08/30/concatenate/" rel="nofollow noopener noreferrer" target="_blank">http://blogs.esri.com/esri/arcgis/2010/08/30/concatenate/</A><BR /><BR /><PRE class="lia-code-sample line-numbers language-none"> # Special case for null soiltype if soil == '': &nbsp;&nbsp;&nbsp; return veg </PRE><BR /><BR /><SPAN>Basically, you need to convert the value into string even if it's already a string.</SPAN></BODY></HTML> Fri, 10 Dec 2021 21:01:15 GMT https://community.esri.com/t5/python-questions/null-in-python/m-p/25204#M1903 ThaiTruong 2021-12-10T21:01:15Z