ConfigParser and String interpolation with env variable

ConfigParser and String interpolation with env variable

In Python, the ConfigParser module provides a way to work with configuration files using an INI-style syntax. You can use string interpolation to reference environment variables within your configuration values.

Here's how you can use ConfigParser with string interpolation to reference environment variables:

  1. Create a Configuration File (config.ini):

    [section_name] key1 = ${ENV_VARIABLE1} key2 = ${ENV_VARIABLE2}

  2. Read the Configuration File Using ConfigParser:

    import os from configparser import ConfigParser # Create a ConfigParser instance config = ConfigParser() # Read the configuration file config.read('config.ini') # Get values from the configuration file and substitute environment variables env_variable1 = os.environ.get('ENV_VARIABLE1') env_variable2 = os.environ.get('ENV_VARIABLE2') key1_value = config.get('section_name', 'key1', fallback='default_value1') key2_value = config.get('section_name', 'key2', fallback='default_value2') # Replace ${ENV_VARIABLE1} and ${ENV_VARIABLE2} with their values key1_value = key1_value.replace('${ENV_VARIABLE1}', env_variable1) key2_value = key2_value.replace('${ENV_VARIABLE2}', env_variable2) print(key1_value) print(key2_value)

Replace 'ENV_VARIABLE1' and 'ENV_VARIABLE2' with the actual names of your environment variables.

Keep in mind that this approach manually replaces the ${ENV_VARIABLE} placeholders with their corresponding values. If you want more advanced interpolation or customization, you might consider using third-party libraries like jinja2 or pydantic.

Examples

  1. "ConfigParser Python example with environment variable interpolation" Description: This search query seeks examples demonstrating how to use Python's ConfigParser library to parse configuration files with string interpolation, including interpolation of environment variables.

    # Example code demonstrating ConfigParser with environment variable interpolation import configparser import os config = configparser.ConfigParser() config.read('config.ini') # Accessing a value with environment variable interpolation username = config.get('Credentials', 'username') password = os.environ.get('PASSWORD') print(f"Username: {username}, Password: {password}")

  2. "Python ConfigParser environment variable substitution" Description: This query is about how to substitute environment variables into ConfigParser values dynamically within Python scripts.

    # Example illustrating environment variable substitution in ConfigParser import configparser import os config = configparser.ConfigParser() config.read('config.ini') # Interpolating environment variables for section in config.sections(): for key, value in config.items(section): if '$' in value: # Assuming $ is the prefix for environment variables config[section][key] = os.path.expandvars(value) # Now the config contains the values with environment variables substituted

  3. "Python ConfigParser interpolation with environment variables" Description: Users seeking information on how to enable interpolation with environment variables in Python's ConfigParser would use this query.

    # Example demonstrating ConfigParser interpolation with environment variables import configparser config = configparser.ConfigParser() config.read('config.ini') config.optionxform = str # Preserve case sensitivity # Enabling environment variable interpolation config._interpolation = configparser.ExtendedInterpolation() # Accessing values with environment variable interpolation print(config.get('Section', 'key'))

  4. "ConfigParser Python environment variable substitution example" Description: This query aims to find an example illustrating how to substitute environment variables into ConfigParser values within Python scripts.

    # Example showing environment variable substitution in ConfigParser import configparser import os config = configparser.ConfigParser() config.read('config.ini') for section in config.sections(): for key, value in config.items(section): if '$' in value: # Assuming $ is the prefix for environment variables env_var = value.split('$', 1)[1] if env_var in os.environ: config[section][key] = os.environ[env_var] # Now the config contains the values with environment variables substituted

  5. "Python ConfigParser interpolation with environment variables example" Description: This query is for users who seek a practical example demonstrating how to interpolate environment variables in Python's ConfigParser.

    # Example demonstrating ConfigParser interpolation with environment variables import configparser config = configparser.ConfigParser() config.read('config.ini') # Enabling environment variable interpolation config.optionxform = str # Preserve case sensitivity config._interpolation = configparser.ExtendedInterpolation() # Accessing values with environment variable interpolation print(config.get('Section', 'key'))

  6. "ConfigParser environment variable substitution Python code" Description: Users interested in direct Python code for substituting environment variables into ConfigParser values would search using this query.

    # Example code for environment variable substitution in ConfigParser import configparser import os config = configparser.ConfigParser() config.read('config.ini') # Substitute environment variables for section in config.sections(): for key, value in config.items(section): if '$' in value: env_var = value.split('$', 1)[1] if env_var in os.environ: config[section][key] = os.environ[env_var] # Now the config contains values with environment variables substituted

  7. "Python ConfigParser interpolate with environment variable" Description: This query is about how to utilize Python's ConfigParser to interpolate values with environment variables.

    # Example demonstrating ConfigParser interpolation with environment variables import configparser config = configparser.ConfigParser() config.read('config.ini') # Enabling environment variable interpolation config._interpolation = configparser.ExtendedInterpolation() # Accessing values with environment variable interpolation print(config.get('Section', 'key'))

  8. "ConfigParser Python environment variable substitution" Description: Users searching this query would expect resources explaining how to substitute environment variables into ConfigParser values using Python.

    # Example illustrating environment variable substitution in ConfigParser import configparser import os config = configparser.ConfigParser() config.read('config.ini') for section in config.sections(): for key, value in config.items(section): if '$' in value: # Assuming $ is the prefix for environment variables env_var = value.split('$', 1)[1] if env_var in os.environ: config[section][key] = os.environ[env_var] # Now the config contains the values with environment variables substituted

  9. "Python ConfigParser environment variable interpolation" Description: This query targets information on how to enable interpolation with environment variables in Python's ConfigParser library.

    # Example demonstrating ConfigParser interpolation with environment variables import configparser config = configparser.ConfigParser() config.read('config.ini') # Enabling environment variable interpolation config.optionxform = str # Preserve case sensitivity config._interpolation = configparser.ExtendedInterpolation() # Accessing values with environment variable interpolation print(config.get('Section', 'key'))

  10. "ConfigParser Python environment variable interpolation example" Description: Users searching this query are looking for a practical example illustrating how to interpolate environment variables in ConfigParser using Python.

    # Example demonstrating ConfigParser interpolation with environment variables import configparser config = configparser.ConfigParser() config.read('config.ini') # Enabling environment variable interpolation config._interpolation = configparser.ExtendedInterpolation() # Accessing values with environment variable interpolation print(config.get('Section', 'key'))

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