[issue44985] Inconsistent returned value of inspect.getfullargspec(object.__init__).
New submission from Mehrzad : The inspection `inspect.getfullargspec(object.__init__)` shows that `object.__init__` takes both varargs (starred) and varkw (double-starred) arguments.* However, it is impossible to call `object.__init__` with varargs or varkw arguments. If one tries to call `object.__init__(SomeClass(), ...)` with either of those arguments, the following error is raised: `TypeError: SomeClass.__init__() takes exactly one argument (the instance to initialize)`. This error is not raised if `SomeClass()` is replaced with some literal, e.g. a number. * I can not certify whether it is intended behavior or a bug, because the signature of `obj.__init__` takes those arguments. -- components: Distutils, Interpreter Core, Parser files: object_init.py messages: 400144 nosy: Mehrzad, dstufft, eric.araujo, lys.nikolaou, pablogsal priority: normal severity: normal status: open title: Inconsistent returned value of inspect.getfullargspec(object.__init__). type: behavior versions: Python 3.7 Added file: https://bugs.python.org/file50229/object_init.py ___ Python tracker <https://bugs.python.org/issue44985> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue44985] Inconsistent returned value of inspect.getfullargspec(object.__init__).
Mehrzad added the comment: My suggestion: Although both `object(...)` and `object.__init__(...)`, run through the same method, they are semantically and intentionally different. 1. `ObjectType(...)`; implicit call of `object.__init__`: The user intends to create an object. If extra arguments given, the following error should rise: 'TypeError: Obj() takes no arguments' This error is already raised from `object.__new__` before `object.__init__` is invoked -- the init function is not reached at all. 2. `object.__init__(object_instance, ...)`; explicit call of `object.__init__`: The user intends to call the `__init__` function for some reason beyond object instance creation. If n-ary arguments given, the following error should *not* rise: 'ObjectType.__init__() takes exactly one argument (the instance to initialize)' One reason I suggest the error should be eliminated is the message is confusing; while `object.__init__` has been called, the name of the non-existing `ObjectType.__init__` method appears on the error message. 3. `object_instance.__init__(...)` where `type(object_instance) == object`: Same behavior as (2). 4. `object_instance.__init__(...)` where `type(object_instance)` is a subclass of `object`: Same behavior as (3). This is one possible solution I can think of -- which also makes the title sort of misleading. This is of course in the case that there are no use-cases making the `object.__init__` exception necessary. However, even in those cases, the implicit and explicit init calls might be distinguishable and the exception may be raised outside `object.__init__`, e.g. by the parser before calling the init. -- ___ Python tracker <https://bugs.python.org/issue44985> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue27028] BasicInterpolation issue with %()
New submission from Mehrzad Irani:
The below code works fine with ExtendedInterpolation; however with
BasicInterpolation it _url fails with invalid variable reference.
The INI file:
[DEFAULT]
domain=abc.labs.com
[machine-details]
compilation_machine=abc1
compilation_machine_url=%(compilation_machine).%(domain)
compilation_machine_url2=${compilation_machine}.${domain}
Python Version:
Python 3.5.1
Environment:
Arch Linux
--
components: Library (Lib)
files: bg.py
messages: 265617
nosy: i.mehrzad
priority: normal
severity: normal
status: open
title: BasicInterpolation issue with %()
type: compile error
versions: Python 3.5
Added file: http://bugs.python.org/file42859/bg.py
___
Python tracker
<http://bugs.python.org/issue27028>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
