diff --git a/Lib/idlelib/editor.py b/Lib/idlelib/editor.py
index 6c52efd655e121..859a288b4bc677 100644
--- a/Lib/idlelib/editor.py
+++ b/Lib/idlelib/editor.py
@@ -1301,7 +1301,7 @@ def smart_backspace_event(self, event):
         want = ((have - 1) // self.indentwidth) * self.indentwidth
         # Debug prompt is multilined....
         ncharsdeleted = 0
-        while 1:
+        while True:
             chars = chars[:-1]
             ncharsdeleted = ncharsdeleted + 1
             have = len(chars.expandtabs(tabwidth))
diff --git a/Lib/idlelib/history.py b/Lib/idlelib/history.py
index 100f505256a940..5a9b32aaf6bb81 100644
--- a/Lib/idlelib/history.py
+++ b/Lib/idlelib/history.py
@@ -65,7 +65,7 @@ def fetch(self, reverse):
                     self.text.bell()
                     return
         nprefix = len(prefix)
-        while 1:
+        while True:
             pointer += -1 if reverse else 1
             if pointer < 0 or pointer >= nhist:
                 self.text.bell()
diff --git a/Lib/idlelib/hyperparser.py b/Lib/idlelib/hyperparser.py
index 77baca782b3fdc..76144ee8fb30f5 100644
--- a/Lib/idlelib/hyperparser.py
+++ b/Lib/idlelib/hyperparser.py
@@ -237,9 +237,9 @@ def get_expression(self):
         last_identifier_pos = pos
         postdot_phase = True
 
-        while 1:
+        while True:
             # Eat whitespaces, comments, and if postdot_phase is False - a dot
-            while 1:
+            while True:
                 if pos>brck_limit and rawtext[pos-1] in self._whitespace_chars:
                     # Eat a whitespace
                     pos -= 1
diff --git a/Lib/idlelib/rpc.py b/Lib/idlelib/rpc.py
index 8efcf048fa3aa2..62eec84c9c8d09 100644
--- a/Lib/idlelib/rpc.py
+++ b/Lib/idlelib/rpc.py
@@ -307,7 +307,7 @@ def _getresponse(self, myseq, wait):
         self.debug("_getresponse:myseq:", myseq)
         if threading.current_thread() is self.sockthread:
             # this thread does all reading of requests or responses
-            while 1:
+            while True:
                 response = self.pollresponse(myseq, wait)
                 if response is not None:
                     return response
@@ -417,7 +417,7 @@ def pollresponse(self, myseq, wait):
         self.responses and notify the owning thread.
 
         """
-        while 1:
+        while True:
             # send queued response if there is one available
             try:
                 qmsg = response_queue.get(0)
diff --git a/Lib/idlelib/run.py b/Lib/idlelib/run.py
index aaa9b5ce8d181f..577c49eb67b20d 100644
--- a/Lib/idlelib/run.py
+++ b/Lib/idlelib/run.py
@@ -145,7 +145,7 @@ def main(del_exitfunc=False):
                                   args=((LOCALHOST, port),))
     sockthread.daemon = True
     sockthread.start()
-    while 1:
+    while True:
         try:
             if exit_now:
                 try:
diff --git a/Lib/idlelib/searchengine.py b/Lib/idlelib/searchengine.py
index eddef581ab40a7..0684142f43644a 100644
--- a/Lib/idlelib/searchengine.py
+++ b/Lib/idlelib/searchengine.py
@@ -165,7 +165,7 @@ def search_backward(self, text, prog, line, col, wrap, ok=0):
         wrapped = 0
         startline = line
         chars = text.get("%d.0" % line, "%d.0" % (line+1))
-        while 1:
+        while True:
             m = search_reverse(prog, chars[:-1], col)
             if m:
                 if ok or m.start() < col: