Read and write properties using config parser in Python script

Question

I am trying to read a property from properties file and if it is not there, i need to add that property to properties file

Following is my script

import ConfigParser

config = ConfigParser.RawConfigParser()
config.read('test.properties')

ip = config.get('client', 'primaryIp')
print "ip is " +ip

if not ip:
    Config.set('client','primaryIp','10.31.1.143')

But it throws the following error at line " ip = config.get('client', 'primaryIp') "

Traceback (most recent call last):
  File "test.py", line 8, in <module>
    ip = config.get('client', 'primaryIp')
  File "/usr/lib64/python2.7/ConfigParser.py", line 340, in get
    raise NoOptionError(option, section)
ConfigParser.NoOptionError: No option 'primaryIp' in section: 'client'

How could i avoid this exception

Kobi K · Accepted Answer · 2015-11-03 08:50:23Z

2

Use try except to catch you exception if there is any.

It's a simple concept if you have the option primaryIp then everything is ok, but if you have an NoOptionError then you need to set the option since it's not present in the file:

import ConfigParser

config = ConfigParser.RawConfigParser()
config.read('test.properties')

try:
    ip = config.get('client', 'primaryIp')
    print "ip is " +ip
except NoOptionError:
    config.set('client','primaryIp','10.31.1.143')

answered Nov 3, 2015 at 8:50

Kobi K

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3 Comments

user3607869 Over a year ago

Executing the above script throws the following exception,Traceback (most recent call last): File "test.py", line 9, in <module> except NoOptionError: NameError: name 'NoOptionError' is not defined

user3607869 Over a year ago

When i modified it to except ConfigParser.NoOptionError:, it executed successfully, but primaryIp property is not written to test.properties

Kobi K Over a year ago

You fix is current or you can from ConfigParser import NoOptionError, as for the set you need to write it to the file from the config object with something like config.write(configfile)

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