Referencing INI files in Python or Ruby

Introduction

It is a method to read the INI file as an example of loading the settings that went out with Ruby and Python.

Execution environment

Python 2.7.5 Ruby 1.9.3

INI file

The INI file to be read looks like this. "Hoge3" is not described in "TEST2" so that you can see the behavior when there is no key name.

test.ini

[TEST1]
hoge1=aaa
hoge2=bbb
hoge3=ccc
hoge4=ddd

[TEST2]
hoge1=AAA
hoge2=BBB
hoge4=CCC

Python First, let Python load the configuration file. Python uses the standard "ConfigParser" module. The execution environment is 2.7, but this area should be almost the same even in 3 series. .. ..

readSetting.py

import ConfigParser

def _get(inifile, section, name):
    try:
        return inifile.get(section, name)
    except Exception, e:
        return "error: could not read " + name

if __name__=="__main__":

    inifile = ConfigParser.SafeConfigParser()
    inifile.read("./test.ini")

    for section in inifile.sections():
        print '===' + section + '==='
        print _get(inifile, section, "hoge1")
        print _get(inifile, section, "hoge2")
        print _get(inifile, section, "hoge3")
        print _get(inifile, section, "hoge4")

result

===TEST1===
aaa
bbb
ccc
ddd
===TEST2===
AAA
BBB
error: could not read hoge3
CCC

If there is no key name, it seems to throw an error.

• By the way, the error that is thrown is "* ConfigParserNoOptionError *"

Ruby Then do the same in Ruby. The execution environment is 1.9.3. In the case of Ruby, you need to install the "inifile module" first. To install, just execute the following gem command.

gem install inifile

And the source code.

readSetting.rb

require 'inifile'

def _get(inifile, section, name)
  begin
    return inifile[section][name]
  rescue => e
    return "error: could not read #{name}"
  end
end

inifile = IniFile.load('./test.ini')

inifile.each_section do |section|
  puts "===#{section}==="
  puts _get(inifile, section, 'hoge1')
  puts _get(inifile, section, 'hoge2')
  puts _get(inifile, section, 'hoge3')
  puts _get(inifile, section, 'hoge4')
end

result

===TEST1===
aaa
bbb
ccc
ddd
===TEST2===
AAA
BBB

CCC

In the case of ruby, it seems that an empty string is returned when there is no key name.

Summary

Python Module is provided as standard Throw an error when there is no key name

Ruby Requires installation If there is no key name, an empty string will be returned and no error will occur.

A little impression

It seems that the application is better if you do not throw an error even if you do not have a key name, I'm happy with the standard if it's an environment where you can't install it freely.