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...issubclass(), the dict method has_key(), the string and unicode methods endswith(), isalnum(), isalpha(), isdigit(), islower(), isspace(), istitle(), isupper(), and startswith(), the unicode methods isdecimal() and isnumeric(), and the 'closed' attribute of file objects. The predicates in the operator module are also changed to return a bool, including operator.truth(). Because bool inherits from int, True+1 is valid and equals 2, and so on. This is important for backwards compatibility: becau...
...issubclass(x.__class__, X) but not issubclass(type(x), X). isinstance(x, X): if X is a new-style class, this is now equivalent to issubclass(type(x), X) or issubclass(x.__class__, X). Previously only type(x) was tested. (For classic classes this was already the case.) compile(), eval() and the exec statement now fully support source code passed as unicode strings. int subclasses can be initialized with longs if the value fits in an int. See SF bug #683467. long(string, base) takes time linear ...
...issubclass(OrderedDict, dict) is true. Changes In addition to the class syntax, the following expose the new behavior: builtins.__build_class__ types.prepare_class types.new_class Also, the 3-argument form of builtins.type() will allow inclusion of __definition_order__ in the namespace that gets passed in. It will be subject to the same constraints as when __definition_order__ is explicitly defined in the class body. Other Python Implementations Pending feedback, the impact on Python impl...
...issubclass(protocol, A): return obj else: return alternate def test_registry(): ''' >>> f = F() >>> f is adapt(f, A) # a failure case Traceback (most recent call last): ... AdaptationError >>> registerAdapterFactory(F, A, adapt_F_to_A) >>> f is adapt(f, A) # case (e) True >>> unregisterAdapterFactory(F, A) >>> f is adapt(f, A) # a failure case again Traceback (most...
...issubclass() checks. The reasoning is similar to why runtime type checks aren't supported in general with many type hints. These features were left out from this PEP, but they are potential extensions to be added in the future: TypedDict doesn't support providing a default value type for keys that are not explicitly defined. This would allow arbitrary keys to be used with a TypedDict object, and only explicitly enumerated keys would receive special treatment compared to a normal, uniform dic...
...IsSubclass() implement isinstance() and issubclass(). Py_BuildValue() now has a "D" conversion to create a Python complex number from a Py_complex C value. Extensions types which support weak references must now set the field allocated for the weak reference machinery to NULL themselves; this is done to avoid the cost of checking each object for having a weakly referencable type in PyObject_INIT(), since most types are not weakly referencable. PyFrame_FastToLocals() and PyFrame_LocalsT...
...issubclass, as well as subclassing will fail for NewType('Derived', Base) since function objects don't support these operations. Stub Files Stub files are files containing type hints that are only for use by the type checker, not at runtime. There are several use cases for stub files: Extension modules Third-party modules whose authors have not yet added type hints Standard library modules for which type hints have not yet been written Modules that must be compatible with Python 2 and 3 Modu...
...issubclass() to the recursion limit of the interpreter. Fixes bug #858016 . Optimized dict iterators, creating separate types for each and having them reveal their length. Also optimized the methods: keys(), values(), and items(). Implemented a newcode opcode, LIST_APPEND, that simplifies the generated bytecode for list comprehensions and further improves their performance (about 35%). Implemented rich comparisons for floats, which seems to make comparisons involving NaNs somewhat less surpri...