Latest version![Atomic Atomic](https://i2.wp.com/freakgenie.com/wp-content/uploads/2018/09/atom-and-molecule-2.png?resize=584%2C362&ssl=1)
Close![Atomic 1 0 1 Atomic 1 0 1](https://images.theconversation.com/files/22593/original/4v43s5qy-1366251497.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1200&h=675.0&fit=crop)
Close
Released:
Apple store el capitan download. (The approx atomic weights are C=12, H=1, O=16) Chemistry. A metal M forms the sulphate M2(SO4)3. A 0.596 gram sample of the sulphate reacts with excess BaCl2 to give 1.220 g BaSO4. What is the atomic weight of M? (Atomic weights: S = 32, Ba = 137.3).
A robust, atomic single-file value store
- Files for atomic-store, version 0.0.1; Filename, size File type Python version Upload date Hashes; Filename, size atomicstore-0.0.1-py3-none-any.whl (8.0 kB) File type Wheel Python version py3 Upload date Jul 14, 2019 Hashes View.
- READ THE DESCRIPTION READ THE DESCRIPTION READ THE DESCRIPTION Testing out the new spidertron!!!! Trying out equipment in the spidertron. Go to the end of th.
- PS Topic 1.0 Eval – Properties of Water. Topic Progress: ← Back to Lesson.
Project description
Easier than a DBMS, but more fault-resistant than just a file.
Sometimes you need to manage a bit of state across executions.Sometimes, a fully-blown database is just too much.
This library makes it easy to keep a store of stuff in a JSON file,in an atomic and fault-resistant manner.
Other formats (like pickle and bson) are also supported,and arbitrary formats are possible.
Table of Contents
Atomic 1 0 1 Fraction
Install
Microsoft word free download for macbook pro. Just
pip install atomic_store
. Or, if you must, pip install -r requirements.txt
Atomic 1000
Note that the only dependency is
atomicwrites
, which has no dependencies.Usage
By default, the store is encoded as json, written to a temporary file,and then atomically replaces the old file. When reading, if the file doesnot exist, a default value is used. The default default value is
None
.Context Manager
This program remembers all start times: Syncovery 7 86c – back up and synchronize your mac.
Leaving the context manager takes care of all writes.No intermediate values get written to disk.
This is ideal if the task runs short, and in case of any erroryou only want to keep the old state anyway.
For advanced uses, also see the subsection on reentrancy.
![Atomic Atomic](https://i2.wp.com/freakgenie.com/wp-content/uploads/2018/09/atom-and-molecule-2.png?resize=584%2C362&ssl=1)
Manual control
This program remembers all start times:
Only calls to
commit()
cause writes to the disk.Again, no intermediate values get written to disk.This is ideal if you have a long-running job with clear steps,and each step's output is valuable.
Note that
commit()
is also available in the context manager.Format tweaks
If you're using the json backend, and want to keep the JSON file as small as possible,you can call
open
with dump_kwargs=dict(separators=(',', ':'))
.The keyword load_kwargs
also exists.Non-JSON formats
You can use arbitrary other formats, using the
format
keyword:Supported values are
None
(for JSON), 'json'
, 'pickle'
,'bson'
(requires bson to be installed), and also any module or objectproviding dump/load
or dumps/loads
.By default, atomic_store
assumes you operate on binary files, except when JSON is involved.To override this, you can set is_binary
.Note that this means you can use the modules json
, pickle
, and bson
as they are. https://coolufiles482.weebly.com/apple-key-on-keyboard.html.For convenience, you can also override the abstract classes
atomic_store.AbstractFormatFile
or atomic_store.AbstractFormatBstr
.In all cases,
load_kwargs
and dump_kwargs
are still supported.Reentrancy
If the same
atomic_store
is used as a context manager more than once,the default behavior is to write the file only when the last with
is exited:If you consider this behavior undesirable, you can either just use multiple context managers (by calling
atomic_store.open
multiple times), or by using the keyword ignore_inner_exits=True
, like this: Kannada nudi software free downloads.Atomic is not magic
This library is not magical.
If two threads (or two processes, or whatever) open a store,modify something, and then write concurrently, one of the results may be lost.However, the writes are guaranteed to be atomic,so the data is merely lost, but not corrupted.
TODOs
- Figure out how to make
bson
optional - Publish on PyPI
NOTDOs
Here are some things this project will not support:
- Any DB backend.
- Any multi-file backend.
- More advanced semantics than just
commit
. - This includes rollback. It's just not obvious which behavior is desired when the file does not exist (Re-use
default
value? What if it was modified, as it happens with lists and dicts?), and with stacked context managers (should it rollback to the file's state? Or to the beginning of thewith
?)
Contribute
Feel free to dive in! Open an issue or submit PRs.
Release historyRelease notifications | RSS feed
Download files
Uselessxray 1 1 0
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Filename, size | File type | Python version | Upload date | Hashes |
---|---|---|---|---|
Filename, size atomic_store-0.0.1-py3-none-any.whl (8.0 kB) | File type Wheel | Python version py3 | Upload date | Hashes |
Filename, size atomic_store-0.0.1.tar.gz (6.6 kB) | File type Source | Python version None | Upload date | Hashes |
Hashes for atomic_store-0.0.1-py3-none-any.whl
![Atomic 1 0 1 Atomic 1 0 1](https://images.theconversation.com/files/22593/original/4v43s5qy-1366251497.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1200&h=675.0&fit=crop)
Algorithm | Hash digest |
---|---|
SHA256 | c6228ad6a631249ee50c181b25fdd852a2df43812385306b355c975b8c07e2cb |
MD5 | ca013d36b81267aaddac8e63b4283b62 |
BLAKE2-256 | faa93a41a6128c62036f4690ae4f5b25477711b5f95d53e9f0246e94cffae57f |
Hashes for atomic_store-0.0.1.tar.gz
Algorithm | Hash digest |
---|---|
SHA256 | 3ce00b2819f3ee3207de79c2aeb66aee1566a4c1fdbae317c72d0ff20a3729e5 |
MD5 | 662660607425ad6223d791b78f9c2ad0 |
BLAKE2-256 | e44a934ebb885d353c63d2b3f2eeda6c7fc01e254685a07c4e16947224754114 |