Read ini file - Printable Version

Read ini file - Printable Version

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Read ini file - ebolisa - Oct-31-2018

Hi,

When running the below code, I get an error message but I don't understand it. I appreciate some insights.
TIA

data.ini

[settings]
volume = "99"
tz = "2"
first-1 = "a"
first-2 = "b"
first-3 = "c"

readini.py

try:
    from configparser import ConfigParser
except ImportError:
    from ConfigParser import ConfigParser  # ver. < 3.0

# instantiate
config = ConfigParser()

# parse existing file
config.read('data.ini')

def readInstance(instance):
    if instance in config.sections(): #checks if the given instance actually exists in the config file
        volume = config.getint[instance]["volume"].strip('\"') #read the specific config data and then convert it into an integer
        tz = config.getint[instance]["tz"].strip('\"') # repeat process for ending
        print volume
        print tz

readInstance("settings")
#print config.getint('settings', 'volume').strip('\"')

error msg.

Traceback (most recent call last):
  File "readini.py", line 24, in <module>
    readInstance("settings")
  File "readini.py", line 14, in readInstance
    volume = config.getint[instance]["volume"].strip('\"') #read the specific config data and then convert it into an integer
TypeError: 'instancemethod' object has no attribute '__getitem__'

RE: Read ini file - j.crater - Oct-31-2018

Hello,
I am not very familiar with the module, but after quickly glancing the examples in docs, you may not be using getint() right
example:

an_int = config.getint('Section1', 'an_int')

RE: Read ini file - ebolisa - Oct-31-2018

Thank you. modified the code but getting a different error. I guess I'm not able to strip the '"'

try:
    from configparser import ConfigParser
except ImportError:
    from ConfigParser import ConfigParser  # ver. < 3.0

# instantiate
config = ConfigParser()

# parse existing file
config.read('data.ini')

def readInstance(instance):
    if instance in config.sections(): #checks if the given instance actually exists in the config file
        #read the specific config data and then convert it into an integer        
        volume = config.getint(instance,'volume').strip('\"')
        # repeat process for ending
        tz = config.getint(instance,'tz').strip('\"') # repeat process for ending
        print volume
        print tz

readInstance("settings")
#print config.getint('settings', 'volume').strip('\"')

error:

Traceback (most recent call last):
  File "readini.py", line 27, in <module>
    readInstance("settings")
  File "readini.py", line 15, in readInstance
    volume = config.getint(instance,'volume')
  File "/home/pi/.local/lib/python2.7/site-packages/backports/configparser/__init__.py", line 834, in getint
    return self._get_conv(section, option, int, **kwargs)
  File "/home/pi/.local/lib/python2.7/site-packages/backports/configparser/__init__.py", line 822, in _get_conv
    return self._get(section, conv, option, **kwargs)
  File "/home/pi/.local/lib/python2.7/site-packages/backports/configparser/__init__.py", line 814, in _get
    return conv(self.get(section, option, **kwargs))
ValueError: invalid literal for int() with base 10: '"99"'

Solved using config.get instead of config.getint.

RE: Read ini file - j.crater - Nov-01-2018

config.get will probably determine the data type automatically, which could sometime have undesirable effects.
If you want to strictly enforce getting an integer value, using getint would be a better choice.
The problem in this case is in the data.ini file.

volume = "99"
# should be
volume = 99

RE: Read ini file - buran - Nov-01-2018

your file should look like this

Output:[settings]
volume = 99
tz = 2
first-1 = a
first-2 = b
first-3 = c

then

try:
    from configparser import ConfigParser
except ImportError:
    from ConfigParser import ConfigParser  # ver. < 3.0
 
# instantiate
config = ConfigParser()
 
# parse existing file
config.read('data.ini')
 
def readInstance(instance):
    if instance in config.sections(): #checks if the given instance actually exists in the config file
        #read the specific config data and then convert it into an integer        
        volume = config.getint(instance,'volume')
        # repeat process for ending
        tz = config.getint(instance,'tz') # repeat process for ending
    return (volume, tz)

vol, tz = readInstance("settings")
print('volume: --> type: {} --> value: {}'.format(type(vol), vol))
print('tz: --> type: {} --> value: {}'.format(type(tz), tz))

Output:volume: --> type: <type 'int'> --> value: 99
tz: --> type: <type 'int'> --> value: 2
>>>

I personally would do it a bit differently - i.e. with try/except and printing message if section/option is missing, or using get and supply default value like None

RE: Read ini file - ebolisa - Nov-01-2018

Thank you but unfortunately, I don’t have control over the ini file which is generated by a web form through a php code. Nor I have a monitor to see the output since I’m running the code on a headless Raspberry PI.