interrogate: explain yourself¶
Interrogate a codebase for docstring coverage.
Why Do I Need This?¶
interrogate checks your code base for missing docstrings.
Documentation should be as important as code itself. And it should live within code. Python standardized docstrings, allowing for developers to navigate libraries as simply as calling help() on objects, and with powerful tools like Sphinx, pydoc, and Docutils to automatically generate HTML, LaTeX, PDFs, etc.
Enter: interrogate.
interrogate will tell you which methods, functions, classes, and modules have docstrings, and which do not. Use interrogate to:
Get an understanding of how well your code is documented;
Add it to CI/CD checks to enforce documentation on newly-added code;
Assess a new code base for (one aspect of) code quality and maintainability.
Let’s get started.
Requirements¶
interrogate supports Python 3.8 and above.
Installation¶
interrogate is available on PyPI and GitHub. The recommended installation method is pip-installing into a virtualenv:
$ pip install interrogate
Extras¶
interrogate provides a way to generate a shields.io-like coverage badge as an SVG file.
To generate a PNG file instead, install interrogate with the extras [png]:
$ pip install interrogate[png]
NOTICE: Additional system libraries/tools may be required in order to generate a PNG file of the coverage badge:
on Windows, install Visual C++ compiler for Cairo;
on macOS, install
cairoandlibffi(with Homebrew for example);on Linux, install the
cairo,python3-devandlibffi-devpackages (names may vary depending on distribution).
Refer to the cairosvg documentation for more information.
Usage¶
Try it out on a Python project:
$ interrogate [PATH]
RESULT: PASSED (minimum: 80.0%, actual: 100.0%)
Add verbosity to see a summary:
$ interrogate -v [PATH]
================== Coverage for /Users/lynn/dev/interrogate/ ====================
------------------------------------ Summary ------------------------------------
| Name | Total | Miss | Cover | Cover% |
|---------------------------------------|---------|--------|---------|----------|
| src/interrogate/__init__.py | 1 | 0 | 1 | 100% |
| src/interrogate/__main__.py | 1 | 0 | 1 | 100% |
| src/interrogate/badge_gen.py | 6 | 0 | 6 | 100% |
| src/interrogate/cli.py | 2 | 0 | 2 | 100% |
| src/interrogate/config.py | 8 | 0 | 8 | 100% |
| src/interrogate/coverage.py | 27 | 0 | 27 | 100% |
| src/interrogate/utils.py | 10 | 0 | 10 | 100% |
| src/interrogate/visit.py | 18 | 0 | 18 | 100% |
| tests/functional/__init__.py | 1 | 0 | 1 | 100% |
| tests/functional/test_cli.py | 8 | 0 | 8 | 100% |
| tests/functional/test_coverage.py | 10 | 0 | 10 | 100% |
| tests/unit/__init__.py | 1 | 0 | 1 | 100% |
| tests/unit/test_badge_gen.py | 8 | 0 | 8 | 100% |
| tests/unit/test_config.py | 10 | 0 | 10 | 100% |
| tests/unit/test_utils.py | 13 | 0 | 13 | 100% |
|---------------------------------------|---------|--------|---------|----------|
| TOTAL | 124 | 0 | 124 | 100.0% |
---------------- RESULT: PASSED (minimum: 80.0%, actual: 100.0%) ----------------
Add even more verbosity:
$ interrogate -vv [PATH]
================== Coverage for /Users/lynn/dev/interrogate/ ====================
------------------------------- Detailed Coverage -------------------------------
| Name | Status |
|---------------------------------------------------------------------|---------|
| src/interrogate/__init__.py (module) | COVERED |
|---------------------------------------------------------------------|---------|
| src/interrogate/__main__.py (module) | COVERED |
|---------------------------------------------------------------------|---------|
| src/interrogate/badge_gen.py (module) | COVERED |
| save_badge (L42) | COVERED |
| get_badge (L87) | COVERED |
| should_generate_badge (L103) | COVERED |
| get_color (L160) | COVERED |
| create (L173) | COVERED |
|---------------------------------------------------------------------|---------|
| src/interrogate/cli.py (module) | COVERED |
| main (L258) | COVERED |
|---------------------------------------------------------------------|---------|
| src/interrogate/config.py (module) | COVERED |
| InterrogateConfig (L19) | COVERED |
| find_project_root (L61) | COVERED |
| find_project_config (L89) | COVERED |
| parse_pyproject_toml (L100) | COVERED |
| sanitize_list_values (L116) | COVERED |
| parse_setup_cfg (L139) | COVERED |
| read_config_file (L173) | COVERED |
|---------------------------------------------------------------------|---------|
| src/interrogate/coverage.py (module) | COVERED |
| BaseInterrogateResult (L23) | COVERED |
| BaseInterrogateResult.perc_covered (L37) | COVERED |
| InterrogateFileResult (L54) | COVERED |
| InterrogateFileResult.combine (L67) | COVERED |
| InterrogateResults (L81) | COVERED |
| InterrogateResults.combine (L93) | COVERED |
| InterrogateCoverage (L101) | COVERED |
| InterrogateCoverage._add_common_exclude (L121) | COVERED |
| InterrogateCoverage._filter_files (L128) | COVERED |
| InterrogateCoverage.get_filenames_from_paths (L141) | COVERED |
| InterrogateCoverage._filter_nodes (L168) | COVERED |
| InterrogateCoverage._filter_inner_nested (L194) | COVERED |
| InterrogateCoverage._get_file_coverage (L203) | COVERED |
| InterrogateCoverage._get_coverage (L231) | COVERED |
| InterrogateCoverage.get_coverage (L248) | COVERED |
| InterrogateCoverage._get_filename (L253) | COVERED |
| InterrogateCoverage._get_detailed_row (L264) | COVERED |
| InterrogateCoverage._create_detailed_table (L281) | COVERED |
| InterrogateCoverage._create_detailed_table._sort_nodes (L288) | COVERED |
| InterrogateCoverage._print_detailed_table (L315) | COVERED |
| InterrogateCoverage._create_summary_table (L338) | COVERED |
| InterrogateCoverage._print_summary_table (L381) | COVERED |
| InterrogateCoverage._sort_results (L399) | COVERED |
| InterrogateCoverage._get_header_base (L429) | COVERED |
| InterrogateCoverage._print_omitted_file_count (L438) | COVERED |
| InterrogateCoverage.print_results (L469) | COVERED |
|---------------------------------------------------------------------|---------|
| src/interrogate/utils.py (module) | COVERED |
| parse_regex (L21) | COVERED |
| smart_open (L40) | COVERED |
| get_common_base (L60) | COVERED |
| OutputFormatter (L80) | COVERED |
| OutputFormatter.should_markup (L90) | COVERED |
| OutputFormatter.set_detailed_markup (L105) | COVERED |
| OutputFormatter.set_summary_markup (L129) | COVERED |
| OutputFormatter._interrogate_line_formatter (L158) | COVERED |
| OutputFormatter.get_table_formatter (L226) | COVERED |
|---------------------------------------------------------------------|---------|
| src/interrogate/visit.py (module) | COVERED |
| CovNode (L15) | COVERED |
| CoverageVisitor (L44) | COVERED |
| CoverageVisitor._has_doc (L58) | COVERED |
| CoverageVisitor._visit_helper (L65) | COVERED |
| CoverageVisitor._is_nested_func (L112) | COVERED |
| CoverageVisitor._is_nested_cls (L121) | COVERED |
| CoverageVisitor._is_private (L133) | COVERED |
| CoverageVisitor._is_semiprivate (L141) | COVERED |
| CoverageVisitor._is_ignored_common (L151) | COVERED |
| CoverageVisitor._has_property_decorators (L168) | COVERED |
| CoverageVisitor._has_setters (L182) | COVERED |
| CoverageVisitor._is_func_ignored (L193) | COVERED |
| CoverageVisitor._is_class_ignored (L217) | COVERED |
| CoverageVisitor.visit_Module (L221) | COVERED |
| CoverageVisitor.visit_ClassDef (L228) | COVERED |
| CoverageVisitor.visit_FunctionDef (L237) | COVERED |
| CoverageVisitor.visit_AsyncFunctionDef (L246) | COVERED |
|---------------------------------------------------------------------|---------|
| tests/functional/__init__.py (module) | COVERED |
|---------------------------------------------------------------------|---------|
| tests/functional/test_cli.py (module) | COVERED |
| runner (L22) | COVERED |
| test_run_no_paths (L30) | COVERED |
| test_run_shortflags (L77) | COVERED |
| test_run_longflags (L106) | COVERED |
| test_run_multiple_flags (L124) | COVERED |
| test_generate_badge (L135) | COVERED |
| test_incompatible_options (L170) | COVERED |
|---------------------------------------------------------------------|---------|
| tests/functional/test_coverage.py (module) | COVERED |
| test_coverage_simple (L60) | COVERED |
| test_coverage_errors (L73) | COVERED |
| test_print_results (L101) | COVERED |
| test_print_results_omit_covered (L130) | COVERED |
| test_print_results_omit_none (L156) | COVERED |
| test_print_results_omit_all_summary (L174) | COVERED |
| test_print_results_omit_all_detailed (L198) | COVERED |
| test_print_results_ignore_module (L226) | COVERED |
| test_print_results_single_file (L253) | COVERED |
|---------------------------------------------------------------------|---------|
| tests/unit/__init__.py (module) | COVERED |
|---------------------------------------------------------------------|---------|
| tests/unit/test_badge_gen.py (module) | COVERED |
| test_save_badge (L26) | COVERED |
| test_save_badge_windows (L50) | COVERED |
| test_save_badge_no_cairo (L62) | COVERED |
| test_get_badge (L73) | COVERED |
| test_should_generate (L96) | COVERED |
| test_get_color (L115) | COVERED |
| test_create (L136) | COVERED |
|---------------------------------------------------------------------|---------|
| tests/unit/test_config.py (module) | COVERED |
| test_find_project_root (L29) | COVERED |
| test_find_project_config (L48) | COVERED |
| test_parse_pyproject_toml (L57) | COVERED |
| test_sanitize_list_values (L93) | COVERED |
| test_parse_setup_cfg (L98) | COVERED |
| test_parse_setup_cfg_raises (L123) | COVERED |
| test_read_config_file_none (L134) | COVERED |
| test_read_config_file (L193) | COVERED |
| test_read_config_file_raises (L207) | COVERED |
|---------------------------------------------------------------------|---------|
| tests/unit/test_utils.py (module) | COVERED |
| test_parse_regex (L32) | COVERED |
| test_smart_open (L39) | COVERED |
| test_get_common_base (L69) | COVERED |
| test_get_common_base_windows (L100) | COVERED |
| test_output_formatter_should_markup (L132) | COVERED |
| test_output_formatter_set_detailed_markup (L163) | COVERED |
| test_output_formatter_set_summary_markup (L206) | COVERED |
| test_output_formatter_interrogate_line_formatter (L258) | COVERED |
| test_output_formatter_interrogate_line_formatter_windows (L319) | COVERED |
| test_output_formatter_get_table_formatter (L343) | COVERED |
| test_output_formatter_get_table_formatter_py38 (L381) | COVERED |
| test_output_formatter_get_table_formatter_raises (L395) | COVERED |
|---------------------------------------------------------------------|---------|
------------------------------------ Summary ------------------------------------
| Name | Total | Miss | Cover | Cover% |
|---------------------------------------|---------|--------|---------|----------|
| src/interrogate/__init__.py | 1 | 0 | 1 | 100% |
| src/interrogate/__main__.py | 1 | 0 | 1 | 100% |
| src/interrogate/badge_gen.py | 6 | 0 | 6 | 100% |
| src/interrogate/cli.py | 2 | 0 | 2 | 100% |
| src/interrogate/config.py | 8 | 0 | 8 | 100% |
| src/interrogate/coverage.py | 27 | 0 | 27 | 100% |
| src/interrogate/utils.py | 10 | 0 | 10 | 100% |
| src/interrogate/visit.py | 18 | 0 | 18 | 100% |
| tests/functional/__init__.py | 1 | 0 | 1 | 100% |
| tests/functional/test_cli.py | 8 | 0 | 8 | 100% |
| tests/functional/test_coverage.py | 10 | 0 | 10 | 100% |
| tests/unit/__init__.py | 1 | 0 | 1 | 100% |
| tests/unit/test_badge_gen.py | 8 | 0 | 8 | 100% |
| tests/unit/test_config.py | 10 | 0 | 10 | 100% |
| tests/unit/test_utils.py | 13 | 0 | 13 | 100% |
|---------------------------------------|---------|--------|---------|----------|
| TOTAL | 124 | 0 | 124 | 100.0% |
---------------- RESULT: PASSED (minimum: 80.0%, actual: 100.0%) ----------------
Other Usage¶
Generate a shields.io badge (like this one! ):
$ interrogate --generate-badge PATH
RESULT: PASSED (minimum: 80.0%, actual: 100.0%)
Generated badge to /Users/lynn/dev/interrogate/docs/_static/interrogate_badge.svg
See below for more badge configuration.
Add it to your tox.ini file to enforce a level of coverage:
[testenv:doc]
deps = interrogate
skip_install = true
commands =
interrogate --quiet --fail-under 95 src tests
Or use it with pre-commit:
repos:
- repo: https://github.com/econchick/interrogate
rev: 1.7.0 # or master if you're bold
hooks:
- id: interrogate
args: [--quiet, --fail-under=95]
pass_filenames: false # needed if excluding files with pyproject.toml or setup.cfg
Use it within your code directly:
>>> from interrogate import coverage
>>> cov = coverage.InterrogateCoverage(paths=["src"])
>>> results = cov.get_coverage()
>>> results
InterrogateResults(total=68, covered=65, missing=3)
Use interrogate with GitHub Actions. Check out the action written & maintained by Jack McKew (thank you, Jack!).
Or use interrogate in VSCode with the interrogate extension written & maintained by Kenneth Love (thank you, Kenneth!).
Configuration¶
Configure within your pyproject.toml (interrogate will automatically detect a pyproject.toml file and pick up default values for the command line options):
$ interrogate -c pyproject.toml [OPTIONS] [PATHS]...
[tool.interrogate]
ignore-init-method = true
ignore-init-module = false
ignore-magic = false
ignore-semiprivate = false
ignore-private = false
ignore-property-decorators = false
ignore-module = false
ignore-nested-functions = false
ignore-nested-classes = true
ignore-setters = false
ignore-overloaded-functions = false
fail-under = 95
exclude = ["setup.py", "docs", "build"]
ignore-regex = ["^get$", "^mock_.*", ".*BaseClass.*"]
ext = []
# possible values: sphinx (default), google
style = sphinx
# possible values: 0 (minimal output), 1 (-v), 2 (-vv)
verbose = 0
quiet = false
whitelist-regex = []
color = true
omit-covered-files = false
generate-badge = "."
badge-format = "svg"
Or configure within your setup.cfg (interrogate will automatically detect a setup.cfg file and pick up default values for the command line options):
$ interrogate -c setup.cfg [OPTIONS] [PATHS]...
[tool:interrogate]
ignore-init-method = true
ignore-init-module = false
ignore-magic = false
ignore-semiprivate = false
ignore-private = false
ignore-property-decorators = false
ignore-module = false
ignore-nested-functions = false
ignore-nested-classes = true
ignore-setters = false
ignore-overloaded-functions = false
fail-under = 95
exclude = setup.py,docs,build
ignore-regex = ^get$,^mock_.*,.*BaseClass.*
ext = []
; possible values: sphinx (default), google
style = sphinx
; possible values: 0 (minimal output), 1 (-v), 2 (-vv)
verbose = 0
quiet = false
whitelist-regex =
color = true
omit-covered-files = false
generate-badge = .
badge-format = svg
Warning
The use of setup.cfg is not recommended unless for very simple use cases. .cfg files use a different parser than pyproject.toml which might cause hard to track down problems. When possible, it is recommended to use pyproject.toml to define your interrogate configuration.
Badge Options¶
Badge Format¶
The default file format is svg. Use the --badge-format flag to create a png file instead.
Note: interrogate must be installed with interrogate[png] in order to generate png files (see above).
$ interrogate --generate-badge PATH --badge-format png
RESULT: PASSED (minimum: 80.0%, actual: 100.0%)
Generated badge to /Users/lynn/dev/interrogate/docs/_static/interrogate_badge.png
Badge Style¶
The following badge styles are available via the --badge-style flag:
option |
example |
|---|---|
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Command Line Options¶
- --version¶
Show the version and exit.
- -v, --verbose¶
Level of verbosity.
NOTE: When configuring verbosity in
pyproject.tomlorsetup.cfg,verbose=1maps to-v, andverbose=2maps to-vv.verbose=0is the equivalent of no verbose flags used, producing minimal output.
- -q, --quiet¶
Do not print output [default:
False]
- -f, --fail-under INT | FLOAT¶
Fail when coverage % is less than a given amount. [default:
80.0]
- -e, --exclude PATH¶
Exclude PATHs of files and/or directories. Multiple
-e/--excludeinvocations supported.
- -i, --ignore-init-method¶
Ignore
__init__method of classes. [default:False]
- -I, --ignore-init-module¶
Ignore
__init__.pymodules. [default:False]
- -m, --ignore-magic¶
Ignore all magic methods of classes. [default:
False]NOTE: This does not include the
__init__method. To ignore__init__methods, use--ignore-init-method.
- -M, --ignore-module¶
Ignore module-level docstrings. [default:
False]
- -n, --ignore-nested-functions¶
Ignore nested functions and methods. [default:
False]
- -C, --ignore-nested-classes¶
Ignore nested classes. [default:
False]
- -O, --ignore-overloaded-functions¶
Ignore @typing.overload-decorated functions. [default:
False]
- -p, --ignore-private¶
Ignore private classes, methods, and functions starting with two underscores. [default:
False]NOTE: This does not include magic methods; use
--ignore-magicand/or--ignore-init-methodinstead.
- -P, --ignore-property-decorators¶
Ignore methods with property setter/getter/deleter decorators. [default:
False]
- -S, --ignore-setters¶
Ignore methods with property setter decorators. [default:
False]
- -s, --ignore-semiprivate¶
Ignore semiprivate classes, methods, and functions starting with a single underscore. [default:
False]
- -r, --ignore-regex STR¶
Regex identifying class, method, and function names to ignore. Multiple
-r/--ignore-regexinvocations supported.
- --ext STR¶
Include Python-like files with the given extension (supported:
pyi). Multiple--extinvocations supported.
- -w, --whitelist-regex STR¶
Regex identifying class, method, and function names to include. Multiple
-r/--ignore-regexinvocations supported.
- --style [sphinx|google]¶
Style of docstrings to honor. Using
googlewill consider a class and its__init__method both covered if there is either a class-level docstring, or an__init__method docstring, instead of enforcing both. Mutually exclusive with-i/--ignore-initflag. [default:sphinx]
- -o, --output FILE¶
Write output to a given
FILE. [default:stdout]
- -c, --config FILE¶
Read configuration from
pyproject.tomlorsetup.cfg.
- --color, --no-color¶
Toggle color output on/off when printing to stdout. [default: color]
- --omit-covered-files¶
Omit reporting files that have 100% documentation coverage. This option is ignored if verbosity is not set. [default:
False]
- -g, --generate-badge PATH¶
Generate a shields.io status badge (an SVG image) in at a given file or directory. Will not generate a badge if results did not change from an existing badge of the same path.
- --badge-format [svg|png]¶
File format for the generated badge. Used with the
-g/--generate-badgeflag. [default:svg]NOTE: To generate a PNG file, interrogate must be installed with
interrogate[png], i.e.pip install interrogate[png].
- --badge-style [flat|flat-square|flat-square-modified|for-the-badge|plastic|social]¶
Desired style of shields.io badge. Used with the -g/–generate-badge flag. [default: flat-square-modified]
Users of Interrogate¶
Interrogate in the Wild¶
Credits¶
interrogate was inspired by docstr-coverage, which was forked from Alexey “DataGreed” Strelkov’s docstring-coverage, which was inspired by a 2004 recipe from James Harlow (turtles…).
The cute
logo is by JustineW purchased via the Noun Project (but also available under the Creative Commons License with attribution).
Changelog¶
1.7.0 (2024-04-07)¶
Added¶
tomli dependency for Python versions < 3.11, making use of tomllib in the standard library with 3.11+ (#150).
Support for
pyifile extensions (and leave room for other file extensions to be added, like maybeipynb).Support for Google-style docstrings for class
__init__methods with new--style [sphinx|google]flag (#128).
Fixed¶
Include support for deleters when ignoring property decorators (#126 <https://github.com/econchick/interrogate/issues/126>_).
Support floats for –fail-under values (#114).
Removed¶
toml dependency for all Python versions (#150).
1.6.0 (2024-04-06)¶
Added¶
Add
--ignore-overloaded-functionsflag to ignore overload decorators (#97) – thank you ErwinJunge (via #167) and zackyancey.Support for Python 3.11 & 3.12.
Removed¶
Support for Python 3.6 & 3.7.
1.5.0 (2021-09-10)¶
Added¶
Fixed¶
Clarify
verboseconfiguration (#83).
1.4.0 (2021-05-14)¶
Added¶
1.3.2 (2020-11-03)¶
Added¶
Fixed¶
Removed¶
Support for Python 3.5 – thank you s-weigand!
1.3.1 (2020-09-03)¶
Fixed¶
Only generate a status badge if results have changed from an existing badge (#40).
1.3.0 (2020-08-23)¶
Added¶
Fixed¶
-e/--excludedoesn’t error if a non-existent file/directory is passed (#38 - thank you MarcoGorelli!).
1.2.0 (2020-05-19)¶
Added¶
Fixed¶
Output now alpha-sorts by directory.
1.1.5 (2020-05-12)¶
Added¶
Add
__main__.pymodule to allow for invocation viapython -m interrogate.
Fixed¶
Removed¶
Removed
networkxdependency.
1.1.4 (2020-05-05)¶
Added¶
Use
interrogatewith pre-commit (addresses Issue #10).
Fixed¶
Fix summary and detail output to fit width of terminal (thank you psobot!).
1.1.3 (2020-05-02)¶
Added¶
New
-w/--whitelist-regexflag: whitelist regex identifying class, method, and function names to include.
Changed¶
-r/--ignore-regexnow supports multiple invocations.
Fixed¶
Fix misleading bug where module info was still outputted even if
--ignore-modulewas used.Fix output when interrogating a single file where filenames were not listed.
1.1.2 (2020-04-29)¶
Fixed¶
Fix typo in non-quiet results output (thanks hynek!).
Added¶
Add 100% test coverage in the form of functional and unit tests.
1.1.1 (2020-04-27)¶
Added¶
Improve docstring content to reflect parameters, return values, and raised exceptions.
1.1.0 (2020-04-24)¶
Added¶
New command to generate a status badge based off of shields.io.
1.0.0.post1 (2020-04-23)¶
Fixed¶
Add long description to
setup.pyso PyPI is happy.
1.0.0 (2020-04-23)¶
Initial release!