How can we fetch ColumnIndex based on Column Name for Syncfusion Grid Control in Python

Did you check the sections at the bottom of that page? They all have examples of code to do different things.

I checked but i haven't seen any method related to fetch column index.

Can you provide a screenshot of the Object Spy tool, with the properties of your grid control?

In concept web page table should not be too different from Windows forms table, and following this example you should be able to manipulate it. You only need to figure out your available similar properties for ColumnIndex and RowIndex. 

Access https://www.w3schools.com/html/tryit.asp?filename=tryhtml_table_intro 

On Project level variables add the following string variables:
ColumnName
ColumnIndex
RowIndex

In NameMapping map the following nodes under NameMapping.Sys.browser.pageW3schoolsTryitEditor.frameIframeresult
column with XPath=//th[.='%ColumnName%']
row with XPath=//tr[%RowIndex%]/td[%ColumnIndex%]

Now you can test it with this code, modify the ColumnName and RowIndex to your choosing

def Test1():
    Var1 = 0
    Browsers.Item[btChrome].Run("https://www.w3schools.com/html/tryit.asp?filename=tryhtml_table_intro")
    Aliases.browser.pageW3schoolsTryitEditor.Wait()
    Aliases.browser.pageW3schoolsTryitEditor.frameIframeresult.RefreshMappingInfo()
    Project.Variables.ColumnName = "Contact"
    Project.Variables.RowIndex = "3"
    Var1 = Aliases.browser.pageW3schoolsTryitEditor.frameIframeresult.column.ColumnIndex
    Project.Variables.ColumnIndex = Var1 + 1
    Log.Message(Aliases.browser.pageW3schoolsTryitEditor.frameIframeresult.row.contentText, "")

P.S. if you like my post give a like, and if it solved your problem mark it as solution to give credit.

I am not trying for webtable, its is for winform using custom control of Syncfusion.