API Reference

class sybil.Sybil(parsers, pattern='', path='.', setup=None, teardown=None, fixtures=(), filenames=(), excludes=(), encoding='utf-8', patterns=())

An object to provide test runner integration for discovering examples in documentation and ensuring they are correct.

Parameters

• parsers – A sequence of callables. See Parsers.

• path –

  The path in which documentation source files are found, relative to the path of the Python source file in which this class is instantiated.

  Note

  This is ignored when using the pytest integration.

• pattern – An optional pattern used to match documentation source files that will be parsed for examples.

• patterns – An optional sequence of patterns used to match documentation source files that will be parsed for examples.

• filenames – An optional set of source file names that, if found anywhere within the root path or its sub-directories, that will be parsed for examples.

• excludes – An optional sequence of patterns of source file names that will excluded when looking for examples.

• setup – An optional callable that will be called once before any examples from a Document are evaluated. If provided, it is called with the document’s namespace.

• teardown – An optional callable that will be called after all the examples from a Document have been evaluated. If provided, it is called with the document’s namespace.

• fixtures – An optional sequence of strings specifying the names of fixtures to be requested when using the pytest integration. The fixtures will be inserted into the document’s namespace. All scopes of fixture are supported.

• encoding – An optional string specifying the encoding to be used when decoding documentation source files.

pytest(class_=None)

The helper method for when you use pytest.

unittest()

The helper method for when you use unittest.

class sybil.Region(start, end, parsed, evaluator)

Parsers should yield instances of this class for each example they discover in a documentation source file.

Parameters

• start – The character position at which the example starts in the Document.

• end – The character position at which the example ends in the Document.

• parsed – The parsed version of the example.

• evaluator – The callable to use to evaluate this example and check if it is as it should be.

class sybil.document.Document(text, path)

This is Sybil’s representation of a documentation source file. It will be instantiated by Sybil and provided to each parser in turn.

evaluator = None

This can be set by evaluators to affect the evaluation of future examples. It can be set to a callable that takes an Example. This callable can then do whatever it needs to do, including not executing the example at all, modifying it, or the Document or calling the original evaluator on the example. This last case should always take the form of example.region.evaluator(example).

text

This is the text of the documentation source file.

path

This is the absolute path of the documentation source file.

namespace

This dictionary is the namespace in which all example parsed from this document will be evaluated.

classmethod parse(path, *parsers, **kw)

Read the text from the supplied path and parse it into a document using the supplied parsers.

line_column(position)

Return a line and column location in this document based on a byte position.

find_region_sources(start_pattern, end_pattern)

This helper method can be called used to extract source text for regions based on the two regular expressions provided.

It will yield a tuple of (start_match, end_match, source) for each occurrence of start_pattern in the document’s text that is followed by an occurrence of end_pattern. The matches will be provided as match objects, while the source is provided as a string.

exception sybil.example.SybilFailure(example, result)

class sybil.example.Example(document, line, column, region, namespace)

This represents a particular example from a documentation source file. It is assembled from the Document and Region the example comes from and is passed to the region’s evaluator.

document

The Document from which this example came.

path

The absolute path of the Document.

line

The line number at which this example occurs in the Document.

column

The column number at which this example occurs in the Document.

region

The Region from which this example came.

start

The character position at which this example starts in the Document.

end

The character position at which this example ends in the Document.

parsed

The version of this example provided by the parser that yielded the Region containing it.

namespace

The namespace of the document from which this example came.

sybil.parsers.doctest.FIX_BYTE_UNICODE_REPR = 2048

A doctest option flag that causes byte and unicode literals in doctest expected output to be rewritten such that they are compatible with the version of Python with which the tests are executed.

class sybil.parsers.doctest.DocTest(examples, globs, name, filename, lineno, docstring)

class sybil.parsers.doctest.OutputChecker(encoding)

check_output(want, got, optionflags)

Return True iff the actual output from an example (got) matches the expected output (want). These strings are always considered to match if they are identical; but depending on what option flags the test runner is using, several non-exact match types are also possible. See the documentation for TestRunner for more information about option flags.

output_difference(example, got, optionflags)

Return a string describing the differences between the expected output for a given example (example) and the actual output (got). optionflags is the set of option flags used to compare want and got.

class sybil.parsers.doctest.DocTestRunner(optionflags, encoding)

class sybil.parsers.doctest.DocTestParser(optionflags=0, encoding='utf-8')

A class to instantiate and include when your documentation makes use of doctest examples.

Parameters

• optionflags – doctest option flags to use when evaluating the examples found by this parser.

• encoding – If on Python 2, this encoding will be used to decode the string resulting from execution of the examples.

class sybil.parsers.codeblock.CodeBlockParser(future_imports=())

A class to instantiate and include when your documentation makes use of codeblock examples.

Parameters

future_imports – An optional list of strings that will be turned into from __future__ import ... statements and prepended to the code in each of the examples found by this parser.

class sybil.parsers.capture.DocumentReverseIterator(document)

sybil.parsers.capture.parse_captures(document)

A parser function to be included when your documentation makes use of capture examples.

sybil.parsers.skip.skip(document)

A parser function to be included when your documentation makes use of skipping examples in a document.