Posts: 221
Threads: 71
Joined: Dec 2017
Hi All,
this is my first script with python class. Thanks all forum admin.
I have few questions
1) is it good practice to have multiple class in single script?
2) how can i return converted values within class?
3) Guide me for improvement
from easysnmp import Session
import time
from datetime import datetime
import datetime
from collections import namedtuple
class fan:
def __init__(self,host,community,version,timeout):
self.host = host
self.community = community
self.version = version
self.timeout = timeout
def get_tmnxChassisFanSpeed(value):
FanSpeed = { '0':'Not Applicable',
'1':'Unknown',
'2':'Half Speed',
'3':'Full Speed',
'4':'Low Speed'
}
return FanSpeed.get(value,"other")
def get_fanstatus(value):
fanstatus = { '1':'Unknown',
'2':'Fan Removed',
'3':'Up',
'4':'Fail',
'5':'Out of Service'
}
return fanstatus.get(value,"other")
def get_fan_details(host):
try:
session = Session(hostname=host, community="cacti", version=2)
tmnxChassisNumFanTrays = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.3.1.10')
NumFanTrays = str(u"{value}".format(value=tmnxChassisNumFanTrays[0].value))
tmnxChassisNumFans = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.3.1.11')
NumFans = str(u"{value}".format(value=tmnxChassisNumFans[0].value))
tmnxChassisFanSpeed = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.4.1.3')
FanSpeed = str(u"{value}".format(value=tmnxChassisFanSpeed[0].value))
tmnxChassisFanOperStatus = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.4.1.2')
FanOperStatus = str(u"{value}".format(value=tmnxChassisFanOperStatus[0].value))
return NumFanTrays, NumFans, FanSpeed, FanOperStatus
except:
print("Unable to create SNMP session with - "+host)
class Chassis:
def __init__(self,host,community,version,timeout):
self.host = host
self.community = community
self.version = version
self.timeout = timeout
def get_tmnxHwAlarmState(value):
HwAlarmState = { '0':'Unknown',
'1':'Alarm Active',
'2':'Alarm Cleared'
}
return HwAlarmState.get(value,"other")
def get_tmnxChassisOverTempState(value):
ChassisOverTempState = {'1':'Ok',
'2':'Over Temp'
}
return ChassisOverTempState.get(value,"other")
def cnvrt_dateTime(val1):
date = datetime.datetime.strptime(val1, '%m%d%Y').strftime('%m/%d/%Y')
return date
def time_ticks_conversion(timeticks):
converted_ticks = datetime.datetime.now() + datetime.timedelta(microseconds = int(timeticks)/10)
return converted_ticks.strftime("%Y-%m-%d %H:%M:%S")
def conv2(data):
Record = namedtuple('Record',
"year month day hour minutes seconds deciseconds "
"direction hoursfromutc minutesfromutc")
L = [ord(x) for x in data]
L[:2] = [256 * L[0] + L[1]]
L[7] = chr(L[7])
manfdate = Record(*L)
manufactured_date=str(manfdate[0])+'/'+str(manfdate[1])+'/'+str(manfdate[2])+' '+str(manfdate[3])+':'+str(manfdate[4])
return manufactured_date
def get_ChassisInfo(host):
try:
session = Session(hostname=host, community="cacti", version=2)
tmnxChassisTypeName = session.get('1.3.6.1.4.1.6527.3.1.2.2.1.6.1.2.20')
ChassisTypeName = str(u"{value}".format(value=tmnxChassisTypeName.value))
tmnxChassisNumSlots = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.3.1.7')
ChassisNumSlots = str(u"{value}".format(value=tmnxChassisNumSlots[0].value))
tmnxChassisNumPorts = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.3.1.8')
ChassisNumPorts = str(u"{value}".format(value=tmnxChassisNumPorts[0].value))
tmnxChassisOverTempState = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.3.1.24')
ChassisOverTempState = str(u"{value}".format(value=tmnxChassisOverTempState[0].value))
tmnxHwBaseMacAddress = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.8.1.29')
HwBaseMacAddress = ':'.join('{:02x}'.format(ord(x)) for x in tmnxHwBaseMacAddress[0].value)
tmnxHwMfgBoardNumber = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.8.1.4')
HwMfgBoardNumber = str(u"{value}".format(value=tmnxHwMfgBoardNumber[0].value))
tmnxHwCLEI = session.walk('1.3.6.1.4.1.6527.3.1.2.2.1.8.1.11')
HwCLEI = str(u"{value}".format(value=tmnxHwCLEI[0].value))
tmnxHwSerialNumber = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.8.1.5')
HwSerialNumber = str(u"{value}".format(value=tmnxHwSerialNumber[0].value))
tmnxHwTemperature = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.8.1.18')
HwTemperature = str(u"{value}".format(value=tmnxHwTemperature[0].value))
tmnxHwSwLastBoot = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.8.1.22')
HwSwLastBoot = str(u"{value}".format(value=tmnxHwSwLastBoot[0].value))
tmnxHwAlarmState = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.8.1.24')
HwAlarmState = str(u"{value}".format(value=tmnxHwAlarmState[0].value))
tmnxHwManufactureDate = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.8.1.6')
HwManufactureDate = str(u"{value}".format(value=tmnxHwManufactureDate[0].value))
return ChassisTypeName,ChassisNumSlots,ChassisNumPorts,ChassisOverTempState,HwBaseMacAddress,HwMfgBoardNumber,\
HwCLEI,HwSerialNumber,HwTemperature,HwSwLastBoot,HwAlarmState,HwManufactureDate
except:
print("Unable to create SNMP session with - "+host)
if __name__ == "__main__":
fandetails = fan.get_fan_details('10.124.209.66')
NumFanTrays = fandetails[0]
NumFans = fandetails[1]
Fanspeed = fan.get_tmnxChassisFanSpeed(fandetails[2])
FanStatus = fan.get_fanstatus(fandetails[3])
print('Num Of Tray:{} Number of Fans: {} Fan Speed:{} Fan Status:{}'.format(NumFanTrays,NumFans,Fanspeed,FanStatus))
chasisdata = Chassis.get_ChassisInfo('10.124.209.66')
print('ChassisType:{} ChassisNumSlots:{} ChassisNumPorts:{} ChassisOverTempState:{} HwBaseMacAddress:{} HwMfgBoardNumber:{} HwCLEI:{}\
HwSerialNumber:{} HwTemperature:{} HwSwLastBoot:{} HwAlarmState:{} HwManufactureDate:{}'.format(chasisdata[0],chasisdata[1],\
chasisdata[2],Chassis.get_tmnxChassisOverTempState(chasisdata[3]),chasisdata[4],chasisdata[5],chasisdata[6],chasisdata[7].strip(),\
chasisdata[8],Chassis.conv2(chasisdata[9]),Chassis.get_tmnxHwAlarmState(chasisdata[10]),Chassis.cnvrt_dateTime(chasisdata[11])))
#print(chasisdata)
Posts: 4,216
Threads: 97
Joined: Sep 2016
(Oct-24-2019, 11:03 AM)anna Wrote: 1) is it good practice to have multiple class in single script?
2) how can i return converted values within class?
3) Guide me for improvement
1) Yes, if they are all related. For example, I have a cards.py file in my t_games project, which has two classes for different kinds of cards, a class for a deck of each of those card objects, and a class for a hand of cards. But then all of the classes for board games are in another file, and the different player classes are in a third file, and so on.
2) I'm not sure exactly what you mean, but by converted values do you mean things like get_fanstatus on line 22? If so, you can return that value into another method:
class Foo(object):
def __init__(self, num):
self.id = self.get_id(num)
def get_id(self, num):
return num + 1 * 2 ** 33) Here's what I noted skimming through your class, not really trying to understand what the code is doing:
3a) Comment your code. Each method or function should have a docstring explaining what it does and what it's parameters are. Each class should have a docstring explaining what it's for, what's it's methods do, and what it's attributes are for. The way I do it is like this:
class Foo(object):
"""
A object for demostrating conversion of values. (object)
Attributes:
id: An ID number for the foo meeting the Scotty criteria. (int)
Methods:
get_id: Convert a number to a valid ID. (int)
"""
def __init__(self, num):
"""
Set up the foo's ID. (None)
Parameters:
num: The integer basis for the foo. (int)
"""
self.id = self.get_id(num)
def get_id(self, num):
"""
Convert a number to a Scotty ID. (int)
Parameters:
num: The base number for the Scotty ID. (int)
"""
return num + 1 * 2 ** 3That may seem like too much, but that's because it's just a ditzy little test class. If it still seems like too much after you do it with your code, that's because you haven't yet had to deal with other people's undocumented code. And other people includes you six months ago. Just because it's totally clear to you now doesn't mean it's totally clear to someone else or somewhen else.
In addition to the docstrings, methods longer than 4 or 5 lines, or that go through multiple steps (as you conceive steps), should have an outline of what they are doing mixed in with the code using # comments.
3b) Be consistent with your variable names. Generally you have different styles for variables, functions/methods, classes, and global constants. You see this a lot in Python: variable_names, function_names, ClassNames, CONSTANT_NAMES. That's PEP 8 style, which is common but not mandatory. However, being consistent with whatever style you use helps make the role of each name clear in the code.
3c) FanSpeed and fanstatus should be class variables. They're don't change but they are closely related to the class. I would do something like this:
class Fan:
fan_speed = { '0':'Not Applicable',
'1':'Unknown',
'2':'Half Speed',
'3':'Full Speed',
'4':'Low Speed'
}
fan_status = { '1':'Unknown',
'2':'Fan Removed',
'3':'Up',
'4':'Fail',
'5':'Out of Service'
}
def __init__(self,host,community,version,timeout):
self.host = host
self.community = community
self.version = version
self.timeout = timeout
def get_fan_speed(value):
return self.fan_speed.get(value,"other")
def get_fan_status(value):
return self.fan_status.get(value,"other")Likewise your Record namedtuple should either be a class attribute or a module level constant. As it is you are reprocessing these objects every time you call those methods. There is no need to do that.
3d) Try/except blocks should be tight and specific. Try to limit the code in the try block to just what will cause the error. If you have one or two lines to process if there is no error, they can go in there. If there's more than a couple of lines to process if there is no error, the except block should return, continue, or break, or there should be an else block for that code. The except statement should specify the specific errors you are expecting. Otherwise they might hide unexpected errors as expected errors, making it harder to debug the unexpected ones. The try/except block is especially heinous.
Posts: 221
Threads: 71
Joined: Dec 2017
thanks, some changes done
1) try/except taken out of class
2) comments are added whenever required
but getting error
from easysnmp import Session
import time
from datetime import datetime
import datetime
#from collections import namedtuple
class fan:
"""\
this class to collect information about fan speed and fan status
final output will be like below
-------------------------------------------------------------------------------
Environment Information
Number of fan trays : 1
Number of fans : 3
Fan tray number : 1
Speed : half speed
Status : up
-------------------------------------------------------------------------------"""
#convert oid number in to fan speed , str oid value
# dict for FanSpeed oid output value
fan_speed = { '0':'Not Applicable',
'1':'Unknown',
'2':'Half Speed',
'3':'Full Speed',
'4':'Low Speed'
}
#convert oid output in fan status, str oid value
#Dict for Fanstatus oid output values
fan_status = { '1':'Unknown',
'2':'Fan Removed',
'3':'Up',
'4':'Fail',
'5':'Out of Service'
}
def __init__(self,host,community,version,timeout):
self.host = host
self.community = community
self.version = version
self.timeout = timeout
# return fan speed and parameter will be oid value
def get_fan_speed(value):
return self.fan_speed.get(value,"other")
#return fan status, parameter will be oid value
def get_fan_status(value):
return self.fan_status.get(value,"other")
def get_fan_details(host):
# establish easysnmp session with host
session = Session(hostname=host, community="cacti", version=2,timeout=5)
# start bulkwalking snmp oids
tmnxChassisNumFanTrays = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.3.1.10')
NumFanTrays = str(u"{value}".format(value=tmnxChassisNumFanTrays[0].value))
tmnxChassisNumFans = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.3.1.11')
NumFans = str(u"{value}".format(value=tmnxChassisNumFans[0].value))
tmnxChassisFanSpeed = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.4.1.3')
FanSpeed = str(u"{value}".format(value=tmnxChassisFanSpeed[0].value))
tmnxChassisFanOperStatus = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.4.1.2')
FanOperStatus = str(u"{value}".format(value=tmnxChassisFanOperStatus[0].value))
return NumFanTrays, NumFans, FanSpeed, FanOperStatus
if __name__ == "__main__":
hosts = ['10.124.209.66','10.124.209.74']
for host in hosts:
try:
fandetails = fan.get_fan_details(host)
except:
break
NumFanTrays = fandetails[0]
NumFans = fandetails[1]
Fanspeed = fan.get_fan_speed(fandetails[2])
FanStatus = fan.get_fan_status(fandetails[3])
print('Num Of Tray:{} Number of Fans: {} Fan Speed:{} Fan Status:{}'.format(NumFanTrays,NumFans,Fanspeed,FanStatus))Error: Traceback (most recent call last):
File "testclas2.py", line 79, in <module>
Fanspeed = fan.get_fan_speed(fandetails[2])
File "testclas2.py", line 49, in get_fan_speed
return self.fan_speed.get(value,"other")
NameError: name 'self' is not defined
Posts: 2,167
Threads: 35
Joined: Sep 2016
Your methods should have self as the first parameter
for example
class fan:
...
...
def get_fan_speed(value):
return self.fan_speed.get(value,"other")change to
class fan:
...
...
def get_fan_speed(self, value):
return self.fan_speed.get(value,"other")this also needs adding on the other methods that self is missing.
Posts: 4,904
Threads: 79
Joined: Jan 2018
Oct-26-2019, 09:54 AM
(This post was last modified: Oct-26-2019, 09:54 AM by Gribouillis.)
anna Wrote:this is my first script with python class. Thanks all forum admin.
You've been a member of the forum for two years and started more than 60 threads but this is your first class ever!  
It's high time to learn that every python object is a class instance! Write as many classes as you can!
Posts: 221
Threads: 71
Joined: Dec 2017
sorry.. changed as suggested.
# return fan speed and parameter will be oid value
def get_fan_speed(self, value):
return self.fan_speed.get(value,"other")
#return fan status, parameter will be oid value
def get_fan_status(self, value):
return self.fan_status.get(value,"other")
showing error
Error: 10.124.209.66
Traceback (most recent call last):
File "testclass3.py", line 81, in <module>
Fanspeed = fan.get_fan_speed(fandetails[2])
TypeError: get_fan_speed() missing 1 required positional argument: 'value'
one more query
how can I return parsed values from class, instead of calling class/function out of class
def get_fan_details(host):
# establish easysnmp session with host
session = Session(hostname=host, community="cacti", version=2,timeout=5)
# start bulkwalking snmp oids
tmnxChassisNumFanTrays = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.3.1.10')
NumFanTrays = str(u"{value}".format(value=tmnxChassisNumFanTrays[0].value))
tmnxChassisNumFans = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.3.1.11')
NumFans = str(u"{value}".format(value=tmnxChassisNumFans[0].value))
tmnxChassisFanSpeed = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.4.1.3')
FanSpeed = str(u"{value}".format(value=tmnxChassisFanSpeed[0].value))
tmnxChassisFanOperStatus = session.bulkwalk('1.3.6.1.4.1.6527.3.1.2.2.1.4.1.2')
FanOperStatus = str(u"{value}".format(value=tmnxChassisFanOperStatus[0].value))
return NumFanTrays, NumFans, FanSpeed,FanOperStatusinstead of
Fanspeed = fan.get_fan_speed(fandetails[2])
FanStatus = fan.get_fan_status(fandetails[3])
Posts: 2,167
Threads: 35
Joined: Sep 2016
Oct-26-2019, 11:49 AM
(This post was last modified: Oct-26-2019, 11:49 AM by Yoriz.)
There should be an instance of the class fan created.
Try going through the class tutorials on the forum that starts with this one
[Classes] Class Basics
also the python docs class tutorial
Posts: 4,216
Threads: 97
Joined: Sep 2016
(Oct-26-2019, 09:42 AM)Yoriz Wrote: Your methods should have self as the first parameter
Sorry about that, that was an error in the code that I posted.
Posts: 221
Threads: 71
Joined: Dec 2017
Posts: 221
Threads: 71
Joined: Dec 2017
is this way?
class host:
fan_speed = { '0':'Not Applicable',
'1':'Unknown',
'2':'Half Speed',
'3':'Full Speed',
'4':'Low Speed'
}
fan_status = { '1':'Unknown',
'2':'Fan Removed',
'3':'Up',
'4':'Fail',
'5':'Out of Service'
}
def __init__(self,host,community,version,timeout):
self.host = host
self.community = community
self.version = version
self.timeout = timeout
self.fan_speed = {}
self.fan_status = {}
def get_fan_speed(self, value):
return self.fan_speed.get(value,"other")
a = host('10.10.10.1','cacti',2,5)Dict get is not correct value
Output: print(a.get_fan_speed('2'))
other
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