Python-bugger

External changes

- Wider variety of bugs generated to induce requested exception type.
- Greater variety of typos.
- Greater variety in placement of bugs.
- Supports `-e IndentationError`.

Internal changes

- The `developer_resources/` dir contains sample nodes.
- Uses a generic `NodeCollector` class.
- Utility functions for generating bugs, ie `utils/bug_utils.make_typo()`.
- End to end tests are less specific, so more resilient to changes in bugmaking algos, while still ensuring the requested exception type is induced.
- Helper function to get all nodes in a file, to support development work.
- Use `random.sample()` (no replacement) rather than `random.choices()` (uses replacement) when selecting which nodes to modify.

Can request more than one type of exception to be induced.

External changes

- Support for `--exception-type AttributeError`.

External changes

- Filters out .py files from dirs named `test_code/`.

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Still only results in a `ModuleNotFoundError`, but creates a much wider range of bugs to induce that error. Also, much better overall structure for continued development.

External changes

- Require `click`.
- Includes a `--num-bugs` arg.
- Modifies specified number of import nodes.
- Randomly selects which relevant node to modify.
- Reports level of success.
- Supports `--target-file` arg.
- Better messaging when not including `--exception-type`.

Internal changes

- CLI is built on `click`, rather than `argparse`.
- Uses a random seed when `PY_BUGGER_RANDOM_SEED` env var is set, for testing.
- Utils dir, with initial `file_utils.py` module.
- Finds all .py files we can consider changing.
- If using Git, returns all tracked .py files not related to testing.
- If not using Git, returns all .py files not in venv, dist, build, or tests.
- Catches `TypeError` if unable to make desired change; we can focus on these kinds of changes as the project evolves.