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...slices, to form range literals: >>> [1:10] [1, 2, 3, 4, 5, 6, 7, 8, 9] >>> [:5] [0, 1, 2, 3, 4] >>> [5:1:-1] [5, 4, 3, 2] There is one minor difference between range literals and the slice syntax: though it is possible to omit all of start, end and step in slices, it does not make sense to omit end in range literals. In slices, end would default to the end of the list, but this has no meaning in range literals. Reference Implementation The proposed implementation ...
...Slice, PySequence_SetSlice, and PySequence_DelSlice. Specification The nb_index slot will have the following signature: PyObject *index_func (PyObject *self) The returned object must be a Python IntType or Python LongType. NULL should be returned on error with an appropriate error set. The __index__ special method will have the signature: def __index__(self): return obj where obj must be either an int or a long. 3 new abstract C-API functions will be added The first checks to see i...
...slice object This extremely creative method exploits the slice objects' behavior, provided that one accepts to use strings (or instantiate properly named placeholder objects for the keys), and accept to use ":" instead of "=". >>> a["K":3] slice('K', 3, None) >>> a["K":3, "R":4] (slice('K', 3, None), slice('R', 4, None)) >>> While clearly smart, this approach does not allow easy inquire of the key/value pair, it's too clever and esotheric, and does not allow to pass ...
...Slice assignment where the rvalue is not the same length as the lvalue will raise an exception. However, slice assignment will work correctly with overlapping slices (typically implemented with memmove). The bytes object will be recognized as a native type by the pickle and cPickle modules for efficient serialization. (In truth, this is the only requirement that can't be implemented via a third party extension.) Partial solutions to address the need to serialize the data stored in a bytes-lik...
...Slice assignment to a bytearray object accepts anything that implements the PEP 3118 buffer API, or an iterable of integers in range(256). Indexing Indexing bytes and bytearray returns small ints (like the bytes type in 3.0a1, and like lists or array.array('B')). Assignment to an item of a bytearray object accepts an int in range(256). (To assign from a bytes sequence, use a slice assignment.) Str() and Repr() The str() and repr() functions return the same thing for these objects. The repr...
...slices of each array, namely: _ufunc.compute(slice, data, func, swap, conv) The 'func' argument is a CFuncObject, while the 'swap' and 'conv' arguments are lists of CFuncObjects for those arrays needing pre- or post-processing, otherwise None is used. The data argument is a list of buffer objects, and the slice argument gives the number of iterations for each dimension along with the buffer offset and step size for each array and each dimension. We have predefined several UFuncs for use by th...
...slice | tuple[integer | slice]) -> image The parameter must be a slice or a tuple that contains two slices or an integer and a slice; the selected area of the image is copied and a new image is returned; image[x:y:z] is equivalent to image[:, x:y:z]. __setitem__(tuple[integer], integer | iterable[integer]) -> None Modifies the pixel at specified position; image[x, y] = integer is a shortcut for image[x, y] = (integer,) for images with a single component. __setitem__(slice | tuple[integer...
...slice(None, 2))[...] = spam >>> # new syntax >>> da[space=0, time=:2] = spam Another example: >>> # old syntax >>> ds["empty"].loc[dict(lon=5, lat=6)] = 10 >>> # new syntax >>> ds["empty"][lon=5, lat=6] = 10 >>> # old syntax >>> ds["empty"].loc[dict(lon=slice(1, 5), lat=slice(3, None))] = 10 >>> # new syntax >>> ds["empty"][lon=1:5, lat=6:] = 10 Functions/methods whose argument is another function (plu...
PEP 580 -- The C call protocol PEP:580 Title:The C call protocol Author:Jeroen Demeyer <J.Demeyer at UGent.be> BDFL-Delegate:Petr Viktorin Status:Rejected Type:Standards Track Created:14-Jun-2018 Python-Version:3.8 Post-History:20-Jun-2018, 22-Jun-2018, 16-Jul-2018 Contents Rejection Notice Abstract Motivation Overview New data structures Parent Using tp_print The C call protocol Checking __objclass__ Self slicing Descriptor behavior The __name__ attribute Generic API...
...slices - the standard sequence types (string, list etc.) now support extended slices. Cute: s[::-1] reverses a string. None - assignment to variables or attributes named None will now trigger a warning. In the future, None may become a keyword. New-style classes now allow assignment to __name__ and __bases__. Interned strings are no longer immortal. sys.setcheckinterval() - the default value for this feature has changed from 10 to 100, for faster execution of interleaving multiple threads (by...
PEP 415 -- Implement context suppression with exception attributes PEP:415 Title:Implement context suppression with exception attributes Author:Benjamin Peterson <benjamin at python.org> BDFL-Delegate:Nick Coghlan Status:Final Type:Standards Track Created:26-Feb-2012 Python-Version:3.3 Post-History:26-Feb-2012 Replaces:409 Resolution:https://mail.python.org/pipermail/python-dev/2012-May/119467.html Contents Abstract PEP Acceptance Rationale Proposal Patches References...
PEP 575 -- Unifying function/method classes PEP:575 Title:Unifying function/method classes Author:Jeroen Demeyer <J.Demeyer at UGent.be> Status:Withdrawn Type:Standards Track Created:27-Mar-2018 Python-Version:3.8 Post-History:31-Mar-2018, 12-Apr-2018, 27-Apr-2018, 05-May-2018 Contents Withdrawal notice Abstract Motivation New classes base_function cfunction defined_function function bound_method Calling base_function instances Checking __objclass__ Flags Self slicing ...
...slice of the pi! We aren’t setting a specific target this year, because honestly it’s been really hard to predict what will be possible for people in general. We aren’t going to pretend anything is easy to forecast right now! But we’d love to have as many of you participate as you can, and bring us all a little extra hap-pi-ness. Your donation allows the PSF to continue to host PyCon US and provide scholarships, tutorials, sprints, and more; to send grants to Python events and projec...
...sliced by provider, location, and the number of days into the future for which the forecasts were predicting. In its first year, 2003, the system only gathered forecasts for 20 U.S. cities, or about 250,000 individual forecasts, so most of the data output was based on the raw scoring data. The aggregation engine was added once the system was scaled up to 800 cities, increasing the data stream by almost 4000%. In the first half of 2004, the system has already scored over 4 million forecasts, all ...
...slice) -> None .__delslice__(int, int) -> None .__eq__(bytes) -> bool .__ge__(bytes) -> bool .__getitem__(int | slice) -> int | bytes .__getslice__(int, int) -> bytes .__gt__(bytes) -> bool .__iadd__(bytes) -> bytes .__imul__(int) -> bytes .__iter__() -> iterator .__le__(bytes) -> bool .__len__() -> int .__lt__(bytes) -> bool .__mul__(int) -> bytes .__ne__(bytes) -> bool .__reduce__(...) -> ... .__reduce_ex__(...) -> ... .__repr__() -> str ._...
...Slices and extended slices won't go away (even if the __getslice__ and __setslice__ APIs may be replaced) nor will they return views for the standard object types. Thread: Future of slices https://mail.python.org/pipermail/python-3000/2006-May/001563.html It will not be forbidden to reuse a loop variable inside the loop's suite. Thread: elimination of scope bleeding of iteration variables https://mail.python.org/pipermail/python-dev/2006-May/064761.html The parser won't be more complex tha...
...slice has to be created and there's no risk of miscounting. Pattern: "foobar"[:3] == "foo" --> "foobar".startswith("foo") "foobar"[-3:] == "bar" --> "foobar".endswith("bar") The atexit Module The atexit module supports multiple functions to be executed upon program termination. Also, it supports parameterized functions. Unfortunately, its implementation conflicts with the sys.exitfunc attribute which only supports a single exit function. Code relying on sys.exitfunc may interfer...
...Slices of the memory-view object are other memory-view objects with the same base but with a different view of the base object. When an "element" from the memory-view is returned it is always a bytes object whose format should be interpreted by the format attribute of the memoryview object. The struct module can be used to "decode" the bytes in Python if desired. Or the contents can be passed to a NumPy array or other object consuming the buffer protocol. The Python name will be __builtin__.me...
...Slices Subject: Re: pass copy of list to function From: "Gordon McMillan" <@hypernet.com> To: Timo Schmitt <@mailhost.uni-koblenz.de>, python-list@cwi.nl Date: Thu, 12 Feb 1998 09:13:59 -0500 Timo asked: > how do i pass a copy of a list of a function? Use the Paranoia emoticon. list = ['blah', 'blah'] f(list[:]) This passes the "here's my desert, where's everyone elses?" slice. Python Block Delimited Notation Parsing Explained Subject: Ad...
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Released: Oct. 5, 2020
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