python: Resolve pep8 blank line errors.

Resolve pep8 errors E302 and E303:

  E302 expected 2 blank lines, found 1
  E303 too many blank lines (3)

Signed-off-by: Russell Bryant <russell@ovn.org>
Acked-by: Ben Pfaff <blp@ovn.org>

python/build/nroff.py

@@ -17,6 +17,7 @@ import sys
 
 from ovs.db import error
 
+
 def text_to_nroff(s, font=r'\fR'):
     def escape(match):
         c = match.group(0)
@@ -56,9 +57,11 @@ def text_to_nroff(s, font=r'\fR'):
     s = re.sub('(-[0-9]|--|[-"\'\\\\.])', escape, s)
     return s
 
+
 def escape_nroff_literal(s, font=r'\fB'):
     return font + r'%s\fR' % text_to_nroff(s, font)
 
+
 def inline_xml_to_nroff(node, font, to_upper=False, newline='\n'):
     if node.nodeType == node.TEXT_NODE:
         if to_upper:
@@ -99,6 +102,7 @@ def inline_xml_to_nroff(node, font, to_upper=False, newline='\n'):
     else:
         raise error.Error("unknown node %s in inline xml" % node)
 
+
 def pre_to_nroff(nodes, para, font):
     # This puts 'font' at the beginning of each line so that leading and
     # trailing whitespace stripping later doesn't removed leading spaces
@@ -168,6 +172,7 @@ def diagram_header_to_nroff(header_node):
         text_s += "\n"
     return pic_s, text_s
 
+
 def diagram_to_nroff(nodes, para):
     pic_s = ''
     text_s = ''
@@ -210,6 +215,7 @@ fillval = .2
 .RE
 \\}"""
 
+
 def block_xml_to_nroff(nodes, para='.PP'):
     s = ''
     for node in nodes:

python/ovs/poller.py

@@ -35,6 +35,7 @@ POLLERR = 0x008
 POLLHUP = 0x010
 POLLNVAL = 0x020
 
+
 # eventlet/gevent doesn't support select.poll. If select.poll is used,
 # python interpreter is blocked as a whole instead of switching from the
 # current thread that is about to block to other runnable thread.

python/ovs/timeval.py

@@ -52,6 +52,7 @@ except:
     # Librt shared library could not be loaded
     librt = None
 
+
 def monotonic():
     if not librt:
         return time.time()
@@ -62,10 +63,12 @@ def monotonic():
     # Kernel does not support CLOCK_MONOTONIC
     return time.time()
 
+
 # Use time.monotonic() if Python version >= 3.3
 if not hasattr(time, 'monotonic'):
     time.monotonic = monotonic
 
+
 def msec():
     """ Returns the system's monotonic time if possible, otherwise returns the
     current time as the amount of time since the epoch, in milliseconds, as a

python/ovs/unixctl/__init__.py

@@ -67,6 +67,7 @@ def command_register(name, usage, min_args, max_args, callback, aux):
         commands[name] = _UnixctlCommand(usage, min_args, max_args, callback,
                                          aux)
 
+
 def socket_name_from_target(target):
     assert isinstance(target, strtypes)
 

python/ovs/unixctl/server.py

@@ -135,6 +135,7 @@ def _unixctl_version(conn, unused_argv, version):
     version = "%s (Open vSwitch) %s" % (ovs.util.PROGRAM_NAME, version)
     conn.reply(version)
 
+
 class UnixctlServer(object):
     def __init__(self, listener):
         assert isinstance(listener, ovs.stream.PassiveStream)

python/ovstest/args.py

@@ -24,6 +24,7 @@ import sys
 CONTROL_PORT = 15531
 DATA_PORT = 15532
 
+
 def ip_address(string):
     """Verifies if string is a valid IP address"""
     try:
@@ -246,6 +247,7 @@ def ovs_initialize_args():
                 'OuterIP.')
     return parser.parse_args()
 
+
 def l3_initialize_args():
     """
     Initialize argument parsing for ovs-l3ping utility.

python/ovstest/tests.py

@@ -139,7 +139,6 @@ def do_l3_tests(node1, node2, bandwidth, duration, ps, type):
             server.del_bridge(DEFAULT_TEST_BRIDGE)
 
 
-
 def do_vlan_tests(node1, node2, bandwidth, duration, ps, tag):
     """
     Do VLAN tests between node1 and node2. Each node is given

python/ovstest/vswitch.py

@@ -33,6 +33,7 @@ def ovs_vsctl_del_bridge(bridge):
     ret, _out, _err = util.start_process(["ovs-vsctl", "del-br", bridge])
     return ret
 
+
 def ovs_vsctl_del_pbridge(bridge, iface):
     """
     This function deletes the OVS bridge and assigns the bridge IP address