+----------------------+---------------------------+-----------------------------+ | Element | Google / PEP 8 Style | Example | +----------------------+---------------------------+-----------------------------+ | Variables | snake_case | user_id, max_depth | | Functions | snake_case | build_tree(), load_data() | | Methods | snake_case | add_node(), to_json() | | Classes | PascalCase | BinaryTree, NodeVisitor | | Exceptions | PascalCase | InvalidStateError | | Constants | SCREAMING_SNAKE_CASE | MAX_RETRIES, DEFAULT_PORT | | Modules (files) | snake_case | tree_utils.py | | Packages (folders) | snake_case | data_structures/ | | Executable scripts | snake_case (no .py) | run_server | | Avoided styles | camelCase, PascalCase for | dataLoader.py, DataLoader.py| | | files, hyphens | data-loader.py | +----------------------+---------------------------+-----------------------------+