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...exist = all(map(operator.exists, iterable)) at_least_one_exists = any(map(operator.exists, iterable)) Design Discussion Subtleties in chaining existence checking expressions Similar subtleties arise in chaining existence checking expressions as already exist in chaining logical operators: the behaviour can be surprising if the right hand side of one of the expressions in the chain itself returns a value that doesn't exist. As a result, value = arg1 ?then f(arg1) ?else default() would be dub...
...Existing Modules This section lists details of major changes to existing modules, whether in implementation or in interface. The changes in this section therefore carry greater degrees of risk, either in introducing bugs or a backward incompatibility. The cgi.py module would be deprecated. (XXX A new module or package name hasn't been chosen yet: 'web'? 'cgilib'?) Minor Changes to Existing Modules This section lists details of minor changes to existing modules. These changes should have rel...
...If an object has a __signature__ property, then inspect.Signature.from_callable() simply returns that. To further support duck-typing, if a callable has a __text_signature__ then the __signature__ will be created from that. This means that 3rd party builtin-functions can implement __text_signature__ if sufficient, and the more expensive __signature__ if necessary. Efficient calls to third-party callables Currently the majority of calls are dispatched to functions and method_descriptors in cust...
...existence one day; a considerable amount of forethought was required, and some of it was even written down. In roughly chronological order: summary of the Developer's Day session at IPC7 (the Seventh International Python Conference, November 1998) requirements overview tasks and roles involved in the Distutils proposed user interface--mainly of historical interest now that the code exists and is d...
...iform depth. If an insert would cause a node to exceed 128 children, the node spawns a sibling and transfers half of its children to the sibling. The sibling is inserted into the node's parent. If the node is the root node (and thus has no parent), a new parent is created and the depth of the tree increases by one. If a deletion would cause a node to have fewer than 64 children, the node moves elements from one of its siblings if possible. If both of its siblings also only have 64 children, t...
...existing clients would still be expected to be able to meaningfully use the API. It is left up to the discretion of any future PEPs as to what specifically constitutes a backwards incompatible vs compatible change beyond the broad suggestion that existing clients will be able to "meaningfully" continue to use the API, and can include adding, modifying, or removing existing features. It is expectation of this PEP that the major version will never be incremented, and any future major API evolutio...
...ifier and specifies its type: interpreted text with roles. Although the Python source context reader is designed not to require explicit roles, they may be used. To classify identifiers explicitly, the role is given along with the identifier in either prefix or suffix form: Use :method:`Keeper.storedata` to store the object's data in `Keeper.data`:instance_attribute:. The syntax chosen for roles is verbose, but necessarily so (if anyone has a better alternative, please post it to the Doc-SIG)...
Python Mobile SIG Charter The Mobile-SIG exists to improve the usability of Python on mobile devices, as mobile platforms have their own unique requirements and constraints. There are two goals: To collaborate on porting CPython to mobile platforms and ensure that other Python implementations (i.e. Jython, IronPython) present much the same environment as CPython when running on mobile devices. To collaborate on the design of modules for mobile-centric features such as cameras, GPS, accelerom...
...existing SSH access and links for Mercurial repositories This PEP proposes leaving the existing hg.python.org installation alone, and setting up Kallithea on a new host. This approach minimises the risk of interfering with the development of CPython itself (and any other projects that don't migrate to the new software forge), but does make any migrations of existing repos more disruptive (since existing checkouts will break). Integration with Roundup Kallithea provides configurable issue track...
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...if PYTHONBYTECODEBASE refers to a directory which is writable by anyone other than root. If so, it could raise an exception or warning and set sys.bytecodebase to None. Or, see the next item. More security - What if PYTHONBYTECODEBASE refers to a general directory (say, /tmp)? In this case, perhaps loading of a preexisting bytecode file should occur only if the file is owned by the current user or root. (Does this matter on Windows?) The interaction of this PEP with import hooks has not been...
...Existing Approaches for Python mypy Reticulated Python PyCharm Others Existing Approaches in Other Languages ActionScript Dart Hack TypeScript References Copyright Abstract This PEP is one of three related to type hinting. This PEP gives a literature overview of related work. The main spec is PEP 484. Existing Approaches for Python mypy (This section is a stub, since mypy [mypy] is essentially what we're proposing.) Reticulated Python Reticulated Python [reticulated] by Michael Vit...
...existing builtin_function_or_method class, but with the following differences and new features: It acts as a descriptor implementing __get__ to turn a function into a method if m_self is NULL. If m_self is not NULL, then this is a no-op: the existing function is returned instead. A new read-only attribute __parent__, represented in the C structure as m_parent. If this attribute exists, it represents the defining object. For methods of extension types, this is the defining class (__class__ in pl...
...If a string value named DisplayName exists, it should be used to identify the environment to users. Otherwise, the name of the key should be used. (For PythonCore, the default is "Python " followed by the Tag.) If a string value named SupportUrl exists, it may be displayed or otherwise used to direct users to a web site related to the environment. (For PythonCore, the default is "http://www.python.org/".) If a string value named Version exists, it should be used to identify the version of the en...
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Responsibilities Design, develop, and implement complex and scalable Python applications. Collaborate with engineers, data scientists, and product managers to understand requirements and deliver high-quality solutions. Write clean, maintainable, and well-documented code. Conduct code reviews and unit testing to ensure code quality. Stay up-to-date with the latest Python technologies and best …
...if the parent package had existed and had a __path__.) When a submodule or subpackage is found (but not yet loaded), the parent package is created and added to sys.modules (if it didn't exist before), and its __path__ is set to the computed virtual path (if it wasn't already set). In this way, when the actual loading of the submodule or subpackage occurs, it will see a parent package existing, and any relative imports will work correctly. However, if no submodule or subpackage exists, then the ...
...if they start with the preposition if_: operator.if_true(LHS) else RHS operator.if_false(LHS) else RHS However, incorporating the if_ doesn't read as well when performing logical inversion: not operator.if_true(LHS) else RHS not operator.if_false(LHS) else RHS Or when using the right-associative circuit breaking operator: LHS if operator.if_true(RHS) LHS if operator.if_false(RHS) Or when naming a binary comparison operation: operator.if_is_sentinel(VALUE, SENTINEL) else EXPR operator.if_i...
...existing Python library tree (not necessarily the system Python library -- could be in a user's home directory, or a temporary directory) Note that these assume the installer is working from a source distribution -- if this is always the case, then the packager has wasted his time, and we don't want that. Installing built distributions should be trivial, but there are a few unresolved concerns: how do we deal with the difference between "smar...
...exist as written in PEP 381. Operators of existing mirrors are encouraged to acquire their own domains and certificates to use for their mirrors if they wish to continue hosting them. Plan for Deprecation & Removal Immediately upon acceptance of this PEP documentation on PyPI will be updated to reflect the deprecated nature of the official public mirrors and will direct users to external resources like http://www.pypi-mirrors.org/ to discover unofficial public mirrors if they wish to use o...