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Problem:
Locator methods return the location where the event starts, not where it ends.
Locator line numbers start at 1, Locator column numbers can be 0.
Proposal:
Adapt documentation.
From the docs:
Instances of Locator provide these methods:
Locator.getColumnNumber() 
Return the column number where the current event ends.
Locator.getLineNumber() 
Return the line number where the current event ends
My Test:
import xml.sax
data = b"""<main>
 <sub
 attr="1"
 id="name"
 >
 <subsub />
 </sub>
</main>"""
class MyHandler(xml.sax.handler.ContentHandler):
 def startElement(self, name, attrs):
 if name == "sub":
 print("open", name, self._locator.getLineNumber(), self._locator.getColumnNumber())
 
 def endElement(self, name):
 if name == "sub":
 print("close", name, self._locator.getLineNumber(), self._locator.getColumnNumber())
xml.sax.parseString(data, MyHandler())
Output:
open sub 2 4
close sub 7 4