rope
Python refactoring library — provides programmatic code refactoring operations on Python projects. rope features: rename (variables, functions, classes, modules), extract function/variable, move (class/function to different module), inline variable, introduce parameter, change function signature, auto-import suggestions, code completion via analysis, find-occurrences for symbol lookup, organize imports, undo/redo for refactoring operations, and Project abstraction for multi-file refactoring. Used by IDE plugins (Vim, Emacs, Sublime) for Python refactoring support.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Local code refactoring library. project.do(changes) modifies files on disk — ensure backup before applying. Validate project root to prevent accidental refactoring outside intended scope. .ropeproject/ cache contains analyzed code — protect if code is sensitive.
⚡ Reliability
Best When
Programmatic Python refactoring where symbol-aware renaming and structural changes are needed — rope handles import updates, cross-file renames, and complex refactoring that simple text substitution cannot.
Avoid When
Code formatting (use black), linting (use pylint), simple text substitution (use sed), or when AST manipulation is more appropriate (use ast module).
Use Cases
- • Agent rename symbol — from rope.base.project import Project; from rope.refactor.rename import Rename; project = Project('/path/to/project'); resource = project.get_resource('mymodule.py'); offset = resource.read().index('old_name'); renamer = Rename(project, resource, offset); changes = renamer.get_changes('new_name'); project.do(changes) — programmatic rename; agent renames symbol across entire project
- • Agent extract function — from rope.refactor.extract import ExtractMethod; start = source.index('code_to_extract'); end = start + len('code_to_extract'); extractor = ExtractMethod(project, resource, start, end); changes = extractor.get_changes('extracted_function_name'); project.do(changes) — code extraction; agent extracts code region into new function
- • Agent find all occurrences — from rope.refactor.occurrences import create_finder; finder = create_finder(project, 'symbol_name', resource, offset); for occurrence in finder: print(occurrence.resource, occurrence.offset) — find usages; agent locates all references to a symbol across project for analysis
- • Agent move module — from rope.refactor.move import create_move; mover = create_move(project, resource, offset); changes = mover.get_changes('new.module.path'); project.do(changes) — module move; agent restructures project by moving classes/functions to different modules; updates all imports automatically
- • Agent undo refactoring — project.history.undo() — undo last refactoring operation; agent provides safe refactoring with undo capability; project.history.redo() for redo; enables dry-run workflow: apply refactoring, verify, undo if incorrect
Not For
- • Code formatting — rope is for semantic refactoring not style; for formatting use black/autopep8
- • Static analysis/linting — rope focuses on refactoring not error detection; use pylint/flake8 for analysis
- • High-volume automated transforms — rope is interactive-speed (100ms-1s per operation); for bulk transforms use AST manipulation directly
Interface
Authentication
No auth — local code refactoring library.
Pricing
rope is LGPL 3.0 licensed. Free for all use.
Agent Metadata
Known Gotchas
- ⚠ Project() creates .ropeproject/ cache directory — Project('/path') writes .ropeproject/ folder with analysis cache; agent code on read-only filesystems or CI will fail; use: project = Project('/path', ropefolder=None) to disable cache directory creation; trade-off: slower analysis without cache
- ⚠ Offset is byte offset not line/column — rope.refactor operations take byte offset (character position in file string); agent code must compute offset: resource.read().index('symbol') for first occurrence; or: sum of lengths of preceding lines + column; offset is 0-based; wrong offset targets wrong symbol
- ⚠ get_changes() does not apply changes — changes = refactor.get_changes() returns ChangeSet describing what would change; project.do(changes) actually applies; agent code must call project.do(changes) explicitly; print(changes.get_description()) to preview changes before applying
- ⚠ rope handles dynamic Python poorly — rope uses static analysis; dynamically created attributes, monkey-patching, and metaprogramming confuse rope; agent code refactoring heavily dynamic Python (Django models, SQLAlchemy) may have missed references; always verify refactoring results manually
- ⚠ project.close() required to release locks — rope holds file handles on .ropeproject/ cache; not calling project.close() causes file handle leaks; agent code: use try/finally: try: ... finally: project.close(); or use contextlib.closing(project) as context manager
- ⚠ RefactoringError does not describe why — rope raises RefactoringError('cannot refactor') without detail; common causes: offset points to non-symbol, keyword not renameable, circular import would result; agent code debugging: try smaller refactoring scope or check offset calculation; rope documentation examples often more reliable than error messages
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Scores are editorial opinions as of 2026-03-06.