Boxine - bx_py_utils

Various Python utility functions

Quickstart

pip install bx_py_utils

Existing stuff

Here only a simple list about existing utilities. Please take a look into the sources and tests for deeper informations.

bx_py_utils.anonymize

• anonymize() - Anonymize the given string with special handling for eMail addresses and the possibility to truncate the output.
• anonymize_dict() - Returns a new dict with anonymized values for keys containing one of the given keywords.

bx_py_utils.auto_doc

• FnmatchExclude() - Helper for auto doc exclude_func that exclude files via fnmatch pattern.
• assert_readme() - Check and update README file with generate_modules_doc()
• assert_readme_block() - Check and update README file: Asset that "text_block" is present between the markers.
• generate_modules_doc() - Generate a list of function/class information via pdoc.
• get_code_location() - Return start and end line number for an object via inspect.

bx_py_utils.aws.client_side_cert_manager

• ClientSideCertManager() - Helper to manage client-side TLS certificate via AWS Secrets Manager by

bx_py_utils.aws.secret_manager

• SecretsManager() - Access AWS Secrets Manager values

bx_py_utils.compat

• removeprefix() - Backport of removeprefix from PEP-616 (Python 3.9+)
• removesuffix() - Backport of removesuffix from PEP-616 (Python 3.9+)

bx_py_utils.dict_utils

• dict_get() - nested dict get()
• dict_list2markdown() - Convert a list of dictionaries into a markdown table.
• pluck() - Extract values from a dict, if they are present

bx_py_utils.doc_write

Doc-Write, see: https://github.com/boxine/bx_py_utils/blob/master/bx_py_utils/doc_write/README.md

bx_py_utils.environ

• OverrideEnviron() - Context manager to change 'os.environ' temporarily.
• cgroup_memory_usage() - Returns the memory usage of the cgroup the Python interpreter is running in.

bx_py_utils.error_handling

• print_exc_plus() - Print traceback information with a listing of all the local variables in each frame.

bx_py_utils.file_utils

• EmptyFileError() - Will be raised from get_and_assert_file_size() if a 0-bytes file was found.
• FileError() - Base error class for all 'file_utils' exceptions.
• FileHasher() - Context Manager for generate different hashes from file content while processing a file.
• FileSizeError() - File size is not the same as the expected size.
• NamedTemporaryFile2() - Generates a temp file with the given filename without any random name sequence.
• OverlongFilenameError() - cut_filename() error: The file name can not be shortened, because sterm is to short.
• TempFileHasher() - File like context manager that combines NamedTemporaryFile2 and FileHasher.
• cut_filename() - Short the file name (and keep the last suffix). Raise OverlongFilenameError if it can't fit.
• get_and_assert_file_size() - Check file size of given file object. Raise EmptyFileError for empty files or return size
• safe_filename() - Makes an arbitrary input suitable to be used as a filename.

bx_py_utils.filename_matcher

• filename_matcher() - Enhance fnmatch that accept a list of patterns.

bx_py_utils.graphql_introspection

• introspection_query() - Generate GraphQL introspection query with variable nested depth.

bx_py_utils.hash_utils

• url_safe_encode() - Encode bytes into a URL safe string.
• url_safe_hash() - Generate a URL safe hash with max_size from given string/bytes.

bx_py_utils.html_utils

• ElementsNotFoundError() - Happens if requested HTML elements cannot be found
• InvalidHtml() - XMLSyntaxError with better error messages: used in validate_html()
• get_html_elements() - Returns the selected HTML elements as string
• pretty_format_html() - Pretty format given HTML document via BeautifulSoup (Needs 'beautifulsoup4' package)
• validate_html() - Validate a HTML document via XMLParser (Needs 'lxml' package)

bx_py_utils.humanize.pformat

• pformat() - Format given object: Try JSON fist and fallback to pformat()

bx_py_utils.humanize.time

• human_timedelta() - Converts a time duration into a friendly text representation.

bx_py_utils.import_utils

• import_string() - Import a dotted module path and return the attribute/class designated by the last name in the path.

bx_py_utils.iteration

• chunk_iterable() - Returns a generator that yields slices of iterable of the given chunk_size.

bx_py_utils.path

• ChangeCurrentWorkDir() - Context Manager change the "CWD" to an other directory.
• MockCurrentWorkDir() - Context Manager to move the "CWD" to a temp directory.
• assert_is_dir() - Check if given path is a directory
• assert_is_file() - Check if given path is a file

bx_py_utils.processify

• processify() - Decorator to run a function as a process.

bx_py_utils.pyproject_toml

• get_pyproject_config() - Get a config section from "pyproject.toml". The path can be optional specify.

bx_py_utils.rison

• rison_dumps() - Encode as RISON, a URL-safe encoding format.

bx_py_utils.stack_info

• FrameNotFound() - Base class for lookup errors.
• last_frame_outside_path() - Returns the stack frame that is the direct successor of given "file_path".

bx_py_utils.string_utils

• compare_sentences() - Calculates the Levenshtein distance between text1 and text2. With filter functionality.
• ensure_lf() - Replace line endings to unix-style.
• get_words() - Extract words from a text. With filter functionality.
• is_uuid() - Returns True if text is a valid UUID (https://www.rfc-editor.org/rfc/rfc9562#name-uuid-format).
• levenshtein_distance() - Calculates the Levenshtein distance between two strings.
• startswith_prefixes() - >>> startswith_prefixes('foobar', prefixes=('foo','bar'))
• truncate() - Truncates the given string to the given length
• uuid_from_text() - Generate a UUID instance from the given text in a determinism may via SHA224 hash.

bx_py_utils.test_utils.assertion

• assert_equal() - Check if the two objects are the same. Display a nice diff, using pformat()
• assert_text_equal() - Check if the two text strings are the same. Display an error message with a diff.
• pformat_ndiff() - Generate a ndiff from two objects, using pformat()
• pformat_unified_diff() - Generate a unified diff from two objects, using pformat()
• text_ndiff() - Generate a ndiff between two text strings.
• text_unified_diff() - Generate a unified diff between two text strings.

bx_py_utils.test_utils.context_managers

• MassContextManager() - A context manager / decorator that enter/exit a list of mocks.

bx_py_utils.test_utils.datetime

• parse_dt() - Helper for easy generate a datetime instance via string.

bx_py_utils.test_utils.deny_requests

• DenyAnyRealRequestContextManager() - Context manager that denies any request via docket/urllib3. Will raise DenyCallError.
• deny_any_real_request() - Deny any request via docket/urllib3. Useful for tests, because they should mock all requests.

bx_py_utils.test_utils.filesystem_utils

• FileWatcher() - Helper to record which new files have been created.

bx_py_utils.test_utils.log_utils

• NoLogs() - Context manager to Suppress all logger outputs
• RaiseLogUsage() - A log handler, that raise an error on every log output.

bx_py_utils.test_utils.mock_aws_secret_manager

• SecretsManagerMock() - Mock for bx_py_utils.aws.secret_manager.SecretsManager()

bx_py_utils.test_utils.mock_boto3session

• MockedBoto3Session() - Mock for boto3.session.Session()

bx_py_utils.test_utils.mock_uuid

• MockUUIDGenerator() - Helper to mock uuid.uuid4() with reproducible results (e.g. for snapshot tests)

bx_py_utils.test_utils.mocks3

A simple mock for Boto3's S3 modules.

• PseudoS3Client() - Simulates a boto3 S3 client object in tests

bx_py_utils.test_utils.redirect

• RedirectOut() - Redirect stdout + stderr into a buffer (with optional strip the output)

bx_py_utils.test_utils.requests_mock_assertion

• assert_json_requests_mock() - Check the requests mock history. In this case all requests must be JSON.
• assert_json_requests_mock_snapshot() - Check requests mock history via snapshot. Accepts only JSON requests.
• assert_requests_mock() - Check the requests mock history. Accept mixed "text" and "JSON".
• assert_requests_mock_snapshot() - Check requests mock history via snapshot. Accept mixed "text" and "JSON".

bx_py_utils.test_utils.snapshot

Assert complex output via auto updated snapshot files with nice diff error messages.

• SnapshotChanged() - Assertion failed.
• assert_binary_snapshot() - Assert binary data via snapshot file
• assert_html_snapshot() - Assert "html" string via snapshot file with validate and pretty format
• assert_py_snapshot() - Assert complex python objects vio PrettyPrinter() snapshot file.
• assert_snapshot() - Assert given data serialized to JSON snapshot file.
• assert_text_snapshot() - Assert "text" string via snapshot file
• get_snapshot_file() - Generate a file path use stack information to fill not provided path components.

bx_py_utils.test_utils.time

• MockTimeMonotonicGenerator() - Helper to mock time.monotonic() in tests.

bx_py_utils.test_utils.unittest_utils

• BaseDocTests() - Helper to include all doctests in unittests, without change unittest setup. Just add a normal TestCase.
• assert_no_flat_tests_functions() - Check if there exists normal test functions (That will not be executed by normal unittests)

bx_py_utils.test_utils.xlsx

• FreezeXlsxTimes() - Context manager / decorator intended to freeze timestamps of xlsx files creation by e.g.: openpyxl.
• generate_xlsx_md_snapshot() - Generate a markdown snapshot of a XLSX: Display ZIP info + Sheets content as Markdown.
• xlsx2dict() - Convert a XLSX file content into a dictionary: Every sheet is a key, and the value is a list of dictionaries.
• xlsx2markdown() - Convert all Sheets of a XLSX into markdown tables.

bx_py_utils.test_utils.zip_file_utils

• FreezeZipFileDatetime() - Context manager / decorator to freezes the modification time of files written to a zip file.
• zip_info() - Generates similar information than unzip -v: Yields ZipFileInfo for each file in the zip file.
• zip_info_markdown() - Generates a markdown representation of the zip file content. Similar to unzip -v output.

bx_py_utils.text_tools

• cutout() - Mark a point in a long text by line no + column with context lines around.

Notes about snapshot

Quick hint about snapshot. If you have many snapshots in your project and you need to change many with a code change, then you can run the tests without a snapshot change leading to an error, by set RAISE_SNAPSHOT_ERRORS=0 in your environment.

e.g.:

RAISE_SNAPSHOT_ERRORS=0 python3 -m unittest

Renew all snapshot files with:

make update-test-snapshot-files

Backwards-incompatible changes

v36 -> v37 - Outsourcing Django stuff

We split bx_py_utils and moved all Django related utilities into the separated project:

• https://github.com/boxine/bx_django_utils

So, bx_py_utils is better usable in non-Django projects, because Django will not installed as decency of "bx_py_utils"

developing

To start developing e.g.:

~$ git clone https://github.com/boxine/bx_py_utils.git
~$ cd bx_py_utils
~/bx_py_utils$ make
help                       List all commands
install-base-req           Install needed base packages via apt
install                    Install the project in a Python virtualenv
update-requirements        Update requirements
lint                       Run code formatters and linter
fix-code-style             Fix code formatting
tox-listenvs               List all tox test environments
tox                        Run tests via tox with all environments
test                       Run tests
coverage                   Run tests with coverage
update-test-snapshot-files Update all snapshot files (by remove and recreate all snapshot files)
mypy                       Run mypy
safety                     Run https://github.com/pyupio/safety
publish                    Release new version to PyPi
clean                      Remove created files from the test project

Create a release

• Increase verion number in bx_py_utils/__init__.py
• Create pull request
• After merge, call: make publish

License

MIT. Patches welcome!

About us

We’ve been rethinking the listening experience for kids and have created an ecosystem where haptic and listening experience are combined via smart technology - the Toniebox.

We are constantly looking for engineers to join our team in different areas. If you’d be interested in contributing to our platform, have a look at: https://tonies.com/jobs/

Links

• https://pypi.org/project/bx-py-utils/