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-rw-r--r--ryu/lib/port_no.py3
1 files changed, 1 insertions, 2 deletions
diff --git a/ryu/lib/port_no.py b/ryu/lib/port_no.py
index 33720f3c..0eb65635 100644
--- a/ryu/lib/port_no.py
+++ b/ryu/lib/port_no.py
@@ -17,8 +17,7 @@
# string representation is in hex without '0x'
_PORT_NO_LEN = 8
-_PORT_NO_LEN_STR = str(_PORT_NO_LEN)
-_PORT_NO_FMT = '%0' + _PORT_NO_LEN_STR + 'x'
+_PORT_NO_FMT = '%0{0}x'.format(_PORT_NO_LEN)
PORT_NO_PATTERN = r'[0-9a-f]{%d}' % _PORT_NO_LEN