PEP8 optimize imports (#242)

To make them PEP8-compliant

8 files changed, 54 insertions, 37 deletions

diff --git a/pysnmp/entity/config.py b/pysnmp/entity/config.py
index e89a102a..0ae87c0b 100644
--- a/pysnmp/entity/config.py
+++ b/pysnmp/entity/config.py
@@ -5,14 +5,20 @@
 # License: http://snmplabs.com/pysnmp/license.html
 #
 from pyasn1.compat.octets import null
-from pysnmp.carrier.asyncore.dgram import udp, udp6
-from pysnmp.proto.secmod.rfc3414.auth import hmacmd5, hmacsha, noauth
-from pysnmp.proto.secmod.rfc3414.priv import des, nopriv
+
+from pysnmp import error
+from pysnmp.carrier.asyncore.dgram import udp
+from pysnmp.carrier.asyncore.dgram import udp6
+from pysnmp.proto.secmod.rfc3414.auth import hmacmd5
+from pysnmp.proto.secmod.rfc3414.auth import hmacsha
+from pysnmp.proto.secmod.rfc3414.auth import noauth
+from pysnmp.proto.secmod.rfc3414.priv import des
+from pysnmp.proto.secmod.rfc3414.priv import nopriv
 from pysnmp.proto.secmod.rfc3826.priv import aes
 from pysnmp.proto.secmod.rfc7860.auth import hmacsha2
-from pysnmp.proto.secmod.eso.priv import des3, aes192, aes256
-from pysnmp.proto import rfc1905
-from pysnmp import error
+from pysnmp.proto.secmod.eso.priv import aes192
+from pysnmp.proto.secmod.eso.priv import aes256
+from pysnmp.proto.secmod.eso.priv import des3
 
 # A shortcut to popular constants
 
diff --git a/pysnmp/entity/engine.py b/pysnmp/entity/engine.py
index 8c4e363a..60b45b0c 100644
--- a/pysnmp/entity/engine.py
+++ b/pysnmp/entity/engine.py
@@ -6,18 +6,22 @@
 #
 import os
 import shutil
-import sys
 import tempfile
+
 from pyasn1.compat.octets import str2octs
-from pysnmp.proto.rfc3412 import MsgAndPduDispatcher
-from pysnmp.proto.mpmod.rfc2576 import SnmpV1MessageProcessingModel, SnmpV2cMessageProcessingModel
-from pysnmp.proto.mpmod.rfc3412 import SnmpV3MessageProcessingModel
-from pysnmp.proto.secmod.rfc2576 import SnmpV1SecurityModel, SnmpV2cSecurityModel
-from pysnmp.proto.secmod.rfc3414 import SnmpUSMSecurityModel
-from pysnmp.proto.acmod import rfc3415, void
-from pysnmp.entity import observer
+
 from pysnmp import debug
 from pysnmp import error
+from pysnmp.entity import observer
+from pysnmp.proto.acmod import rfc3415
+from pysnmp.proto.acmod import void
+from pysnmp.proto.mpmod.rfc2576 import SnmpV1MessageProcessingModel
+from pysnmp.proto.mpmod.rfc2576 import SnmpV2cMessageProcessingModel
+from pysnmp.proto.mpmod.rfc3412 import SnmpV3MessageProcessingModel
+from pysnmp.proto.rfc3412 import MsgAndPduDispatcher
+from pysnmp.proto.secmod.rfc2576 import SnmpV1SecurityModel
+from pysnmp.proto.secmod.rfc2576 import SnmpV2cSecurityModel
+from pysnmp.proto.secmod.rfc3414 import SnmpUSMSecurityModel
 
 __all__ = ['SnmpEngine']
 
diff --git a/pysnmp/entity/rfc3413/cmdgen.py b/pysnmp/entity/rfc3413/cmdgen.py
index 9ca9b50b..6f13c265 100644
--- a/pysnmp/entity/rfc3413/cmdgen.py
+++ b/pysnmp/entity/rfc3413/cmdgen.py
@@ -4,14 +4,16 @@
 # Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
 # License: http://snmplabs.com/pysnmp/license.html
 #
-import sys
+from pyasn1.type import univ
+
+from pysnmp import debug
+from pysnmp import error
+from pysnmp import nextid
 from pysnmp.entity.rfc3413 import config
-from pysnmp.proto import rfc1905, errind
+from pysnmp.proto import errind
 from pysnmp.proto.api import v2c
-from pysnmp.proto.proxy import rfc2576
-from pysnmp import error, nextid, debug
 from pysnmp.proto.error import StatusInformation
-from pyasn1.type import univ
+from pysnmp.proto.proxy import rfc2576
 
 getNextHandle = nextid.Integer(0x7fffffff)
 
diff --git a/pysnmp/entity/rfc3413/cmdrsp.py b/pysnmp/entity/rfc3413/cmdrsp.py
index 52951a4b..7910b86b 100644
--- a/pysnmp/entity/rfc3413/cmdrsp.py
+++ b/pysnmp/entity/rfc3413/cmdrsp.py
@@ -4,13 +4,16 @@
 # Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
 # License: http://snmplabs.com/pysnmp/license.html
 #
-import sys
-from pysnmp.proto import rfc1902, rfc1905, rfc3411, errind, error
+import pysnmp.smi.error
+from pysnmp import debug
+from pysnmp.proto import errind
+from pysnmp.proto import error
+from pysnmp.proto import rfc1902
+from pysnmp.proto import rfc1905
+from pysnmp.proto import rfc3411
 from pysnmp.proto.api import v2c  # backend is always SMIv2 compliant
 from pysnmp.proto.proxy import rfc2576
-import pysnmp.smi.error
 from pysnmp.smi import exval
-from pysnmp import debug
 
 
 # 3.2
diff --git a/pysnmp/entity/rfc3413/config.py b/pysnmp/entity/rfc3413/config.py
index 7689824b..c58c74ba 100644
--- a/pysnmp/entity/rfc3413/config.py
+++ b/pysnmp/entity/rfc3413/config.py
@@ -4,8 +4,9 @@
 # Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
 # License: http://snmplabs.com/pysnmp/license.html
 #
-from pysnmp.smi.error import SmiError, NoSuchInstanceError
 from pysnmp.entity import config
+from pysnmp.smi.error import NoSuchInstanceError
+from pysnmp.smi.error import SmiError
 
 
 def getTargetAddr(snmpEngine, snmpTargetAddrName):
diff --git a/pysnmp/entity/rfc3413/context.py b/pysnmp/entity/rfc3413/context.py
index 7d3c3262..9a99f284 100644
--- a/pysnmp/entity/rfc3413/context.py
+++ b/pysnmp/entity/rfc3413/context.py
@@ -4,10 +4,11 @@
 # Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
 # License: http://snmplabs.com/pysnmp/license.html
 #
-from pyasn1.type import univ
 from pyasn1.compat.octets import null
-from pysnmp import error
+from pyasn1.type import univ
+
 from pysnmp import debug
+from pysnmp import error
 
 
 class SnmpContext(object):
diff --git a/pysnmp/entity/rfc3413/ntforg.py b/pysnmp/entity/rfc3413/ntforg.py
index 0c686635..be0d0dbf 100644
--- a/pysnmp/entity/rfc3413/ntforg.py
+++ b/pysnmp/entity/rfc3413/ntforg.py
@@ -4,16 +4,14 @@
 # Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
 # License: http://snmplabs.com/pysnmp/license.html
 #
-import sys
-from pyasn1.compat.octets import null
+from pysnmp import debug
+from pysnmp import nextid
 from pysnmp.entity.rfc3413 import config
-from pysnmp.proto.proxy import rfc2576
+from pysnmp.proto import errind
+from pysnmp.proto import error
 from pysnmp.proto import rfc3411
 from pysnmp.proto.api import v2c
-from pysnmp.proto import errind, error
-from pysnmp.smi import view, rfc1902
-from pysnmp import nextid
-from pysnmp import debug
+from pysnmp.proto.proxy import rfc2576
 
 getNextHandle = nextid.Integer(0x7fffffff)
 
diff --git a/pysnmp/entity/rfc3413/ntfrcv.py b/pysnmp/entity/rfc3413/ntfrcv.py
index c286ec54..a4754be2 100644
--- a/pysnmp/entity/rfc3413/ntfrcv.py
+++ b/pysnmp/entity/rfc3413/ntfrcv.py
@@ -4,12 +4,14 @@
 # Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
 # License: http://snmplabs.com/pysnmp/license.html
 #
-import sys
 from pyasn1.compat.octets import null
-from pysnmp.proto import rfc3411, error
-from pysnmp.proto.api import v1, v2c  # backend is always SMIv2 compliant
-from pysnmp.proto.proxy import rfc2576
+
 from pysnmp import debug
+from pysnmp.proto import error
+from pysnmp.proto import rfc3411
+from pysnmp.proto.api import v1
+from pysnmp.proto.api import v2c  # backend is always SMIv2 compliant
+from pysnmp.proto.proxy import rfc2576
 
 
 # 3.4