bpo-45975: Simplify some while-loops with walrus operator (GH-29347)

3 files changed, 3 insertions, 11 deletions

diff --git a/Lib/xml/dom/expatbuilder.py b/Lib/xml/dom/expatbuilder.py
index 199c22d..7dd667b 100644
--- a/Lib/xml/dom/expatbuilder.py
+++ b/Lib/xml/dom/expatbuilder.py
@@ -200,10 +200,7 @@ class ExpatBuilder:
         parser = self.getParser()
         first_buffer = True
         try:
-            while 1:
-                buffer = file.read(16*1024)
-                if not buffer:
-                    break
+            while buffer := file.read(16*1024):
                 parser.Parse(buffer, False)
                 if first_buffer and self.document.documentElement:
                     self._setup_subset(buffer)
diff --git a/Lib/xml/etree/ElementTree.py b/Lib/xml/etree/ElementTree.py
index ebbe2b7..df5d519 100644
--- a/Lib/xml/etree/ElementTree.py
+++ b/Lib/xml/etree/ElementTree.py
@@ -566,10 +566,7 @@ class ElementTree:
                     # it with chunks.
                     self._root = parser._parse_whole(source)
                     return self._root
-            while True:
-                data = source.read(65536)
-                if not data:
-                    break
+            while data := source.read(65536):
                 parser.feed(data)
             self._root = parser.close()
             return self._root
diff --git a/Lib/xml/sax/xmlreader.py b/Lib/xml/sax/xmlreader.py
index 716f228..e906121 100644
--- a/Lib/xml/sax/xmlreader.py
+++ b/Lib/xml/sax/xmlreader.py
@@ -120,10 +120,8 @@ class IncrementalParser(XMLReader):
         file = source.getCharacterStream()
         if file is None:
             file = source.getByteStream()
-        buffer = file.read(self._bufsize)
-        while buffer:
+        while buffer := file.read(self._bufsize):
             self.feed(buffer)
-            buffer = file.read(self._bufsize)
         self.close()
 
     def feed(self, data):