changeset:   100475:a0de41b46aa6
branch:      3.5
parent:      100472:1725d310e445
user:        Serhiy Storchaka <storchaka@gmail.com>
date:        Tue Mar 08 23:35:35 2016 +0200
files:       Lib/fileinput.py
description:
Issue #15068: Avoid creating a reference loop in fileinput.


diff -r 1725d310e445 -r a0de41b46aa6 Lib/fileinput.py
--- a/Lib/fileinput.py	Tue Mar 08 13:10:29 2016 -0800
+++ b/Lib/fileinput.py	Tue Mar 08 23:35:35 2016 +0200
@@ -207,7 +207,6 @@
         self._startlineno = 0
         self._filelineno = 0
         self._file = None
-        self._readline = self._start_readline
         self._isstdin = False
         self._backupfilename = None
         # restrict mode argument to reading modes
@@ -245,15 +244,15 @@
         return self
 
     def __next__(self):
-        line = self._readline()
-        if line:
-            self._filelineno += 1
-            return line
-        if not self._file:
-            raise StopIteration
-        self.nextfile()
-        # Recursive call
-        return self.__next__()
+        while True:
+            line = self._readline()
+            if line:
+                self._filelineno += 1
+                return line
+            if not self._file:
+                raise StopIteration
+            self.nextfile()
+            # repeat with next file
 
     def __getitem__(self, i):
         if i != self.lineno():
@@ -277,7 +276,10 @@
         finally:
             file = self._file
             self._file = None
-            self._readline = self._start_readline
+            try:
+                del self._readline  # restore FileInput._readline
+            except AttributeError:
+                pass
             try:
                 if file and not self._isstdin:
                     file.close()
@@ -301,7 +303,7 @@
             self.nextfile()
             # repeat with next file
 
-    def _start_readline(self):
+    def _readline(self):
         if not self._files:
             if 'b' in self._mode:
                 return b''
@@ -356,7 +358,7 @@
                     self._file = self._openhook(self._filename, self._mode)
                 else:
                     self._file = open(self._filename, self._mode)
-        self._readline = self._file.readline
+        self._readline = self._file.readline  # hide FileInput._readline
         return self._readline()
 
     def filename(self):