Python Configuration Files - OS ENV

Python Configuraton Files

Configuration w.r.t System Env Variable

In this example, we shall explore how set a configuration variable that uses env values

Define Local variable

[code lang=”bash”] bash3.2$ export THIS_IS_A_TEST_VARIABLE=’/TMP/A/B/123’ [/code]

Define App Config File

Check config file

[code lang=”bash”] bash3.2$ cat config.ini [/code]

Output

[code lang=”python”] [DEFAULT] test_home=%(THIS_IS_A_TEST_VARIABLE)s

[test] test_1=%(test_home)s/foo.csv test_2=%(THIS_IS_A_TEST_VARIABLE)s/bar.csv [/code]

Define Python Config parser file

[code lang=”bash”] bash3.2$ cat env_config_test.py [/code]

Content of env_config_test files.

[code lang=”python”] import os from ConfigParser import SafeConfigParser

config = SafeConfigParser(os.environ) config.readfp(open(‘config.ini’))

print(config.get(‘test’, ‘test_1’)) [/code]

Test

[code lang=”bash”] bash3.2$ python env_config_test.py
/TMP/A/B/123/foo.csv [/code]

As you can see, this above config value is used for test_2 config variable.