Update common.py

[richardcmckinney]

• Removed the UNICODE_EXISTS check and the unicode lambda function, as they are not used in the provided code snippet.

• Simplified the configuration loading in the load_config function by using a dictionary comprehension to create the rv dictionary in a single line.

• Used '{}.{}'.format(section, key) instead of '%s.%s' % (section, key) for string formatting, as it is more readable and efficient.

• Used os.makedirs(cfg_dir, exist_ok=True) instead of checking for the existence of cfg_dir and creating it manually. The exist_ok=True parameter ensures that the function doesn't raise an error if the directory already exists.

• Replaced unicode(value) with str(value) since the unicode function is not defined in Python 3.

• Import Management:

• Removed the unnecessary try-except block for configparser import. The use of ConfigParser (Python 2) is outdated, as we assume Python 3 in modern environments.

• _get_config_path Function:

• Simplified path retrieval using os.path.join to build the path to the configuration file in the application directory.
• Added a docstring for better understanding of the function's purpose.

• load_config Function:

• Included detailed docstrings to describe the function's purpose and behavior, including its return type and potential
• Replaced the list comprehension with a generator expression for improved memory efficiency.
• Ensured the configuration is read from the specified file path.

• save_config Function:

• Added detailed docstrings to describe the function's parameters and purpose.
• Used os.makedirs with exist_ok=True to handle directory creation more efficiently.
• Replaced SafeConfigParser with ConfigParser as the former is an alias for the latter in Python 3.
• Ensured configuration data is properly written to the file.