<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def setup(self, config_file=None, aws_config=None, gpg_config=None, decrypt_gpg=True, decrypt_kms=True):
 """Make setup easier by providing a constructor method. Move to config_file File can be located with a filename only, relative path, or absolute path. If only name or relative path is provided, look in this order: 1. current directory 2. `~/.config/<file_name>` 3. `/etc/<file_name>` It is a good idea to include you __package__ in the file name. For example, `cfg = Config(os.path.join(__package__, 'config.yaml'))`. This way it will look for your_package/config.yaml, ~/.config/your_package/config.yaml, and /etc/your_package/config.yaml. """

        if aws_config is not None:
            self.aws_config = aws_config
        if gpg_config is not None:
            self.gpg_config = gpg_config
        if decrypt_kms is not None:
            self.decrypt_kms = decrypt_kms
        if decrypt_gpg is not None:
            self.decrypt_gpg = decrypt_gpg
        # Again, load the file last so that it can rely on other properties.
        if config_file is not None:
            self.config_file = config_file
        return self