def get(self, key, default=None, cast=None):
try:<EOL><INDENT>envkey = '<STR_LIT>' % key.upper().replace('<STR_LIT:.>', '<STR_LIT:_>')<EOL>value = os.environ.get(envkey)<EOL>if value is None:<EOL><INDENT>section, name = key.lower().split('<STR_LIT:.>')<EOL>value = self.data.get(section, {}).get(name, default)<EOL><DEDENT>return cast(value) if cast else value<EOL><DEDENT>except:  <EOL><INDENT>return default<EOL><DEDENT>
Returns the specified configuration value or <default> if not found.

            Parameters:
                key (str): Configuration variable to load in the format '<section>.<variable>'.
                default: Default value to use if key not found.
                cast (func): Cast the value to the specified type before returning.