Fix more Python warnings (sonic-net#869)

* Fix "First parameter of a method is not named 'self'" warnings

* Fix "Module is imported with 'import' and 'import from'" warning

* Fix 'Testing equality to None' warnings

* Clean up 'Unused import' warnings

config/main.py

@@ -3,7 +3,6 @@
 import sys
 import os
 import click
-import json
 import subprocess
 import netaddr
 import re

config/mlnx.py

@@ -10,12 +10,8 @@
     import os
     import subprocess
     import click
-    import imp
     import syslog
-    import types
-    import traceback
     import time
-    from tabulate import tabulate
 except ImportError as e:
     raise ImportError("%s - required module not found" % str(e))
 

config/nat.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
 
 import click
-import socket
-import netaddr
 import ipaddress
 from swsssdk import ConfigDBConnector
 from swsssdk import SonicV2Connector

connect/main.py

@@ -1,11 +1,8 @@
 #! /usr/bin/python -u
 
 import click
-import errno
 import os
 import pexpect
-import subprocess
-import sys
 from click_default_group import DefaultGroup
 
 try:

consutil/lib.py

@@ -8,7 +8,6 @@
 try:
     import click
     import re
-    import swsssdk
     import subprocess
     import sys
 except ImportError as e:

consutil/main.py

@@ -9,8 +9,6 @@
     import click
     import os
     import pexpect
-    import re
-    import subprocess
     import sys
     from tabulate import tabulate
     from lib import *

crm/main.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python
 
-import os
 import click
 import swsssdk
 from tabulate import tabulate

debug/main.py

@@ -2,10 +2,8 @@
 # date: 07/12/17
 
 import click
-import os
 import subprocess
 from click_default_group import DefaultGroup
-from pprint import pprint
 
 def run_command(command, pager=False):
     click.echo(click.style("Command: ", fg='cyan') + click.style(command, fg='green'))

pddf_fanutil/main.py

@@ -8,15 +8,8 @@
 try:
     import sys
     import os
-    import subprocess
     import click
-    import imp
-    import syslog
-    import types
-    import traceback
     from tabulate import tabulate
-    from utilities_common import util_base
-    from utilities_common.util_base import UtilLogger
     from utilities_common.util_base import UtilHelper
 except ImportError as e:
     raise ImportError("%s - required module not found" % str(e))

pddf_ledutil/main.py

@@ -8,15 +8,7 @@
 try:
     import sys
     import os
-    import subprocess
     import click
-    import imp
-    import syslog
-    import types
-    import traceback
-    from tabulate import tabulate
-    from utilities_common import util_base
-    from utilities_common.util_base import UtilLogger
     from utilities_common.util_base import UtilHelper
 except ImportError as e:
     raise ImportError("%s - required module not found" % str(e))

pddf_psuutil/main.py

@@ -8,15 +8,8 @@
 try:
     import sys
     import os
-    import subprocess
     import click
-    import imp
-    import syslog
-    import types
-    import traceback
     from tabulate import tabulate
-    from utilities_common import util_base
-    from utilities_common.util_base import UtilLogger
     from utilities_common.util_base import UtilHelper
 except ImportError as e:
     raise ImportError("%s - required module not found" % str(e))

pddf_thermalutil/main.py

@@ -8,15 +8,8 @@
 try:
     import sys
     import os
-    import subprocess
     import click
-    import imp
-    import syslog
-    import types
-    import traceback
     from tabulate import tabulate
-    from utilities_common import util_base
-    from utilities_common.util_base import UtilLogger
     from utilities_common.util_base import UtilHelper
 except ImportError as e:
     raise ImportError("%s - required module not found" % str(e))

pfc/main.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python
 
-import os
 import click
 import swsssdk
 from tabulate import tabulate
@@ -160,4 +159,4 @@ def showPrio(interface):
 config.add_command(configAsym, "asymmetric")
 config.add_command(configPrio, "priority")
 show.add_command(showAsym, "asymmetric")
-show.add_command(showPrio, "priority")
+show.add_command(showPrio, "priority")

psuutil/main.py

@@ -12,8 +12,6 @@
     import click
     import imp
     import syslog
-    import types
-    import traceback
     from tabulate import tabulate
 except ImportError as e:
     raise ImportError("%s - required module not found" % str(e))

scripts/aclshow

@@ -21,13 +21,10 @@ from __future__ import print_function
 import argparse
 import json
 import os
-import re
-import subprocess
 import swsssdk
 import sys
 
 from tabulate import tabulate
-from natsort import natsorted
 
 ### temp file to save counter positions when doing clear counter action.
 ### if we could have a SAI command to clear counters will be better, so no need to maintain

scripts/configlet

@@ -76,13 +76,9 @@ A sample for update:
 """
 
 from __future__ import print_function
-import sys
-import os.path
 import argparse
 import json
 import time
-from collections import OrderedDict
-from natsort import natsorted
 from swsssdk import ConfigDBConnector
 
 test_only = False

scripts/db_migrator.py

@@ -6,9 +6,6 @@
 import syslog
 from swsssdk import ConfigDBConnector
 import sonic_device_util
-import os
-import subprocess
-import json
 
 
 SYSLOG_IDENTIFIER = 'db_migrator'

scripts/decode-syseeprom

@@ -5,17 +5,11 @@
 # This is the main script that handles eeprom encoding and decoding
 #
 try:
-    import exceptions
-    import binascii
-    import time
     import optparse
     import warnings
     import os
-    import subprocess
     import sys
-    from array import array
     import imp
-    from sonic_eeprom import eeprom_dts
     import glob
     from sonic_device_util import get_machine_info
     from sonic_device_util import get_platform_info
@@ -55,7 +49,7 @@ def main():
     # Currently, don't support eeprom db on Arista platform
     platforms_without_eeprom_db = ['arista', 'kvm']
     if any(platform in platform_path for platform in platforms_without_eeprom_db)\
-            or getattr(t, 'read_eeprom_db', None) == None:
+            or getattr(t, 'read_eeprom_db', None) is None:
         support_eeprom_db = False
 
     #

scripts/dump_nat_entries.py

@@ -5,7 +5,6 @@
              so as to restore them during warm reboot
 """
 
-import sys
 import subprocess
 
 def main():

scripts/ecnconfig

@@ -50,7 +50,6 @@ from __future__ import print_function
 
 import os
 import sys
-import json
 import argparse
 import swsssdk
 from tabulate import tabulate

scripts/fanshow

@@ -4,8 +4,6 @@
 """
 from __future__ import print_function
 
-import argparse
-
 from tabulate import tabulate
 from swsssdk import SonicV2Connector
 from natsort import natsorted

scripts/fdbclear

@@ -15,9 +15,7 @@ import argparse
 import json
 import sys
 
-from natsort import natsorted
-from swsssdk import SonicV2Connector, port_util
-from tabulate import tabulate
+from swsssdk import SonicV2Connector
 
 class FdbClear(object):
 

scripts/intfstat

@@ -9,12 +9,8 @@
 import argparse
 import cPickle as pickle
 import datetime
-import getopt
 import sys
 import os
-import json
-import re
-import subprocess
 import swsssdk
 import sys
 import time

scripts/natclear

@@ -12,11 +12,8 @@
 import argparse
 import json
 import sys
-import subprocess
 
-from natsort import natsorted
 from swsssdk import SonicV2Connector
-from tabulate import tabulate
 
 class NatClear(object):
 

scripts/natconfig

@@ -39,10 +39,8 @@
 """
 
 import argparse
-import json
 import sys
 
-from natsort import natsorted
 from tabulate import tabulate
 from swsssdk import ConfigDBConnector
 

scripts/natshow

@@ -61,7 +61,6 @@ import json
 import sys
 import re
 
-from natsort import natsorted
 from swsssdk import SonicV2Connector
 from tabulate import tabulate
 

scripts/neighbor_advertiser

@@ -17,9 +17,7 @@ import traceback
 import subprocess
 import time
 import warnings
-import sonic_device_util
 from swsssdk import ConfigDBConnector
-from swsssdk import SonicV2Connector
 from netaddr import IPAddress, IPNetwork
 
 

scripts/pfcstat

@@ -11,10 +11,7 @@ import sys
 import argparse
 import cPickle as pickle
 import datetime
-import getopt
-import json
 import os.path
-import time
 
 from collections import namedtuple, OrderedDict
 from natsort import natsorted

scripts/portconfig

@@ -17,9 +17,7 @@ optional arguments:
 """
 from __future__ import print_function
 
-import os
 import sys
-import json
 import argparse
 import swsssdk
 

scripts/portstat

@@ -9,10 +9,7 @@
 import argparse
 import cPickle as pickle
 import datetime
-import getopt
 import os.path
-import re
-import subprocess
 import swsssdk
 import sys
 import time

scripts/queuestat

@@ -9,8 +9,6 @@
 import argparse
 import cPickle as pickle
 import datetime
-import getopt
-import json
 import os.path
 import swsssdk
 import sys

scripts/sfpshow

@@ -3,16 +3,14 @@
     Script to show sfp eeprom and presence status.
     Not like sfputil this scripts get the sfp data from DB directly.  
 """
-import argparse
-import json
 import sys
 import click
 import re
 import operator
 import os
 
 from natsort import natsorted
-from swsssdk import SonicV2Connector, port_util
+from swsssdk import SonicV2Connector
 from tabulate import tabulate
 
 # Mock the redis for unit test purposes #