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...mapping tables should be implemented using static C data in separate (shared) extension modules. That way multiple processes can share the same data. A tool to auto-convert Unicode mapping files to mapping modules should be provided to simplify support for additional mappings (see References). Whitespace The .split() method will have to know about what is considered whitespace in Unicode. Case Conversion Case conversion is rather complicated with Unicode data, since there are many different...
...mapping, it is as if empty cells don't exist. However, once added, a cell is never deleted from a celldict, and it is possible to get at empty cells using the getcell() method. The celldict implementation never uses the cellptr attribute of cells. We change the module implementation to use a celldict for its __dict__. The module's getattr, setattr and delattr operations now map to getitem, setitem and delitem on the celldict. The type of <module>.__dict__ and globals() is probably the o...
...maps between attributes or methods of objects and relational columns, tables, and databases. This mapping is not intended to store actual object attributes into relational tables, but rather only those attributes relevant to facilitating fast queries. In this way, the relational database is used as an index into the Zope object database. To provide support for fast queries of the object database, ZSQLCatalog copies select attributes (dots) and relations (lines) from the object database into t...
...mapping of bytecode to line numbers from compilation. The interpreter uses this mapping to point to the source line associated with an error. While this line-level granularity for instructions is useful, a single line of Python code can compile into dozens of bytecode operations making it hard to track which part of the line caused the error. Consider the following line of Python code: x['a']['b']['c']['d'] = 1 If any of the values in the dictionaries are None, the error shown is: Traceback (...
...mapping (URL). This is patterned after the footnote notion in setext but is easier on the eyes. For example, "Pythonland" will be marked as a hyper-references to Python.org. If no matching trailing reference is found then nothing is done.
...mapping from property name to prediction function. If a requested property name (the dictionary key) is in the cache, we reuse it. Otherwise, we find the associated function, call it to compute the value, store the result in the cache, and return it. The functions themselves are given a reference to the Properties manager so they can recursively request any additionally needed dependencies. To add a new prediction we register the new function in the function table -- and let the functions themse...
...Map (dfa) -> dict The symbolToStringMap() function will accept a DFA instance and return a dictionary object that maps from the DFA's numeric values for its nonterminals to the string names of the nonterminals as found in the original grammar specification for the DFA. stringToSymbolMap (dfa) -> dict The stringToSymbolMap() function output a dictionary mapping the nonterminal names of the input DFA to their corresponding numeric values. Extra credit will be awarded if the map generation ...
...Mapping between issues from bpo and GitHub Nosy-ing the expert Open issues A GitHub account should not be a requirement Trim off the "Components" list Priority list Further questions and discussions Acknowledgements References Copyright Abstract This PEP describes the detailed plan for migrating from Python's issue tracker on Roundup to GitHub issues. See PEP 581 for rationale and background. PEP 588 also describes the detailed timeline for the migration. Migration Plan Here we outlin...
...mappings, even mappings that only implement a subset of {__getitem__, keys, values, items}. It makes code iterating over non-sequence collections more concise and readable. Resolved Issues The following topics have been decided by consensus or BDFL pronouncement. Two alternative spellings for next() have been proposed but rejected: __next__(), because it corresponds to a type object slot (tp_iternext); and __call__(), because this is the only operation. Arguments against __next__(): while ma...
Version: None
Released: Oct. 4, 2014
This is a security-fix source-only release. The last binary release was 3.2.5. The list of fixed security related issues can be found in the NEWS file. New features of the 3.2 series, compared to 3.1 Python 3.2 is a continuation of the efforts to improve and stabilize the …
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Released: April 5, 2022
This is an early developer preview of Python 3.11 Major new features of the 3.11 series, compared to 3.10 Python 3.11 is still in development. This release, 3.11.0a7 is the last of seven planned alpha releases. Alpha releases are intended to make it easier to test the current state of …
...map(lambda key: key.upper(), doc["key"] for doc in read_newline_separated_json(path))) If our file contains a document where doc["key"] turns out to be an integer, then the following sequence of events will happen: key.upper() raises an AttributeError, which propagates out of the map and triggers the implicit finally block inside list. The finally block in list calls __iterclose__() on the map object. map.__iterclose__() calls __iterclose__() on the generator comprehension object. Thi...
...map Unicodes 0xFFFD, 0xFFFE, and 0xFFFF in the stylesheet to these unescaped characters. I also found an archived post on the docbook-apps mailing list that was extremely helpful for aligning the contents of DocBook download components into a workable hierarchy. An Example Python API for DocBook To support development of the necessary content inserter with DocBook, I needed a Python API that could be used to quickly generate the SGML formatted documents. The design chosen for this API provides...
...Mapping abstract base class. The constructor and update() both accept iterables of tuples as well as mappings like a dict does. Unlike a regular dictionary, the insertion order is preserved. >>> d = OrderedDict([('a', 'b'), ('c', 'd')]) >>> d.update({'foo': 'bar'}) >>> d collections.OrderedDict([('a', 'b'), ('c', 'd'), ('foo', 'bar')]) If ordered dicts are updated from regular dicts, the ordering of new keys is of course undefined. All iteration methods as well as...
...mapped to these parameters based solely on their position. This PEP is an Informational PEP describing the notation for use when describing APIs that use positional-only parameters (e.g. in Argument Clinic, or in the string representation of inspect.Signature objects). A separate PEP, PEP 570, proposes elevation of this notation to full Python syntax. Rationale Python has always supported positional-only parameters. Early versions of Python lacked the concept of specifying parameters by name, ...
...Mapping[str, int], since there may be additional non-int values not visible through the type, due to structural subtyping. These can be accessed using the values() and items() methods in Mapping, for example. Example: class A(TypedDict): x: int class B(TypedDict): x: int y: str def sum_values(m: Mapping[str, int]) -> int: n = 0 for v in m.values(): n += v # Runtime error return n def f(a: A) -> None: sum_values(a) # Error: 'A' incompatible with Ma...
...map], int], ) -> BetterCallable[[Ts], [Tmap], str]: def decorated(*args: Ts, **kwargs: Tmap) -> str: x = f(*args, **kwargs) return int_to_str(x) return decorated @decorator def foo(x: int) -> int: return x reveal_type(foo) # Option A: BetterCallable[[int], {}, str] # Option B: BetterCallable[[], {x: int}, str] foo(7) # fails under option B foo(x=7) # fails under option A The core problem here is that, by default, parameters in Python can either be cal...
...Mapping[str, Any]] = ..., decoder: TomlDecoder = ..., ) -> MutableMapping[str, Any]: ... This is quite different from the first argument proposed in this PEP: SupportsRead[bytes]. Recapping the reasons for this, previously mentioned at Types accepted as the first argument of tomllib.load: Allowing paths (and even lists of paths) as arguments is inconsistent with other similar functions in the standard library. Using SupportsRead[bytes] allows us to ensure UTF-8 is the encoding used, and...
...mapping parameter names to an object representing the evaluated annotation expression There is a special key in the __annotations__ mapping, "return". This key is present only if an annotation was supplied for the function's return value. For example, the following annotation: def foo(a: 'x', b: 5 + 6, c: list) -> max(2, 9): ... would result in an __annotations__ mapping of {'a': 'x', 'b': 11, 'c': list, 'return': 9} The return key was chosen because it cannot conflict with the na...
Released: Oct. 12, 2014
This is a security-fix source-only release. The last binary release was 3.2.5. With the 3.2.6 release, and five years after its first release, the Python 3.2 series is now officially retired. All official maintenance for Python 3.2, including security patches, has ended. For ongoing maintenance releases, please see the …