diff --git a/Lib/idlelib/GrepDialog.py b/Lib/idlelib/GrepDialog.py
--- a/Lib/idlelib/GrepDialog.py
+++ b/Lib/idlelib/GrepDialog.py
@@ -81,31 +81,19 @@
         hits = 0
         for fn in list:
             try:
-                f = open(fn, errors='replace')
+                with open(fn, errors='replace') as f:
+                    for lineno, line in enumerate(f):
+                        if line[-1:] == '\n':
+                            line = line[:-1]
+                        if prog.search(line):
+                            sys.stdout.write("%s: %s: %s\n" %
+                                             (fn, lineno, line))
+                            hits += 1
             except OSError as msg:
                 print(msg)
-                continue
-            lineno = 0
-            while 1:
-                block = f.readlines(100000)
-                if not block:
-                    break
-                for line in block:
-                    lineno = lineno + 1
-                    if line[-1:] == '\n':
-                        line = line[:-1]
-                    if prog.search(line):
-                        sys.stdout.write("%s: %s: %s\n" % (fn, lineno, line))
-                        hits = hits + 1
-        if hits:
-            if hits == 1:
-                s = ""
-            else:
-                s = "s"
-            print("Found", hits, "hit%s." % s)
-            print("(Hint: right-click to open locations.)")
-        else:
-            print("No hits.")
+        print(("Hits found: %s\n"
+              "(Hint: right-click to open locations.)"
+              % hits) if hits else "No hits.")

     def findfiles(self, dir, base, rec):
         try: