# 
# patch "paramiko/sftp_client.py"
#  from [e7da642c8bb505413bddce8b8d74b2cef3747a92]
#    to [5bd2a4fe7cfc525df863b12e4dd585afd4d34bb9]
# 
# patch "paramiko/sftp_file.py"
#  from [5757e42b2f3cdffea10937e6c370663d8badda40]
#    to [b6da074f26d4d2e8f891d0eb823d8ac9e9d50121]
# 
========================================================================
--- paramiko/sftp_client.py	e7da642c8bb505413bddce8b8d74b2cef3747a92
+++ paramiko/sftp_client.py	5bd2a4fe7cfc525df863b12e4dd585afd4d34bb9
@@ -185,7 +185,7 @@
         if ('w' in mode):
             imode |= SFTP_FLAG_CREATE | SFTP_FLAG_TRUNC
         if ('a' in mode):
-            imode |= SFTP_FLAG_APPEND
+            imode |= SFTP_FLAG_APPEND | SFTP_FLAG_CREATE | SFTP_FLAG_WRITE
         attrblock = SFTPAttributes()
         t, msg = self._request(CMD_OPEN, filename, imode, attrblock)
         if t != CMD_HANDLE:
========================================================================
--- paramiko/sftp_file.py	5757e42b2f3cdffea10937e6c370663d8badda40
+++ paramiko/sftp_file.py	b6da074f26d4d2e8f891d0eb823d8ac9e9d50121
@@ -45,6 +45,15 @@
         self.close()
         
     def close(self):
+        # We allow double-close without signaling an error, because real
+        # Python file objects do.  However, we must protect against actually
+        # sending multiple CMD_CLOSE packets, because after we close our
+        # handle, the same handle may be re-allocated by the server, and we
+        # may end up mysteriously closing some random other file.  (This is
+        # especially important because we unconditionally call close() from
+        # __del__.)
+        if self._closed:
+            return
         BufferedFile.close(self)
         try:
             self.sftp._request(CMD_CLOSE, self.handle)