Modern high-performance serialization utilities for Python

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Project description

srsly: Modern high-performance serialization utilities for Python

This package bundles some of the best Python serialization libraries into one standalone package, with a high-level API that makes it easy to write code that's correct across platforms and Pythons. This allows us to provide all the serialization utilities we need in a single binary wheel. Currently supports JSON, JSONL, MessagePack, Pickle and YAML.

Motivation

Serialization is hard, especially across Python versions and multiple platforms. After dealing with many subtle bugs over the years (encodings, locales, large files) our libraries like spaCy and Prodigy had steadily grown a number of utility functions to wrap the multiple serialization formats we need to support (especially json, msgpack and pickle). These wrapping functions ended up duplicated across our codebases, so we wanted to put them in one place.

At the same time, we noticed that having a lot of small dependencies was making maintenance harder, and making installation slower. To solve this, we've made srsly standalone, by including the component packages directly within it. This way we can provide all the serialization utilities we need in a single binary wheel.

srsly currently includes forks of the following packages:

ujson
msgpack
msgpack-numpy
cloudpickle
ruamel.yaml (without unsafe implementations!)

Installation

⚠️ Note that v2.x is only compatible with Python 3.6+. For 2.7+ compatibility, use v1.x.

srsly can be installed from pip. Before installing, make sure that your pip, setuptools and wheel are up to date.

python -m pip install -U pip setuptools wheel
python -m pip install srsly

Or from conda via conda-forge:

conda install -c conda-forge srsly

Alternatively, you can also compile the library from source. You'll need to make sure that you have a development environment with a Python distribution including header files, a compiler (XCode command-line tools on macOS / OS X or Visual C++ build tools on Windows), pip and git installed.

Install from source:

# clone the repo
git clone https://github.com/explosion/srsly
cd srsly

# create a virtual environment
python -m venv .env
source .env/bin/activate

# update pip
python -m pip install -U pip setuptools wheel

# compile and install from source
python -m pip install .

For developers, install requirements separately and then install in editable mode without build isolation:

# install in editable mode
python -m pip install -r requirements.txt
python -m pip install --no-build-isolation --editable .

# run test suite
python -m pytest --pyargs srsly

API

JSON

📦 The underlying module is exposed via srsly.ujson. However, we normally interact with it via the utility functions only.

`function` `srsly.json_dumps`

Serialize an object to a JSON string. Falls back to json if sort_keys=True is used (until it's fixed in ujson).

data = {"foo": "bar", "baz": 123}
json_string = srsly.json_dumps(data)

Argument	Type	Description
`data`	-	The JSON-serializable data to output.
`indent`	int	Number of spaces used to indent JSON. Defaults to `0`.
`sort_keys`	bool	Sort dictionary keys. Defaults to `False`.
RETURNS	str	The serialized string.

`function` `srsly.json_loads`

Deserialize unicode or bytes to a Python object.

data = '{"foo": "bar", "baz": 123}'
obj = srsly.json_loads(data)

Argument	Type	Description
`data`	str / bytes	The data to deserialize.
RETURNS	-	The deserialized Python object.

`function` `srsly.write_json`

Create a JSON file and dump contents or write to standard output.

data = {"foo": "bar", "baz": 123}
srsly.write_json("/path/to/file.json", data)

Argument	Type	Description
`path`	str / `Path`	The file path or `"-"` to write to stdout.
`data`	-	The JSON-serializable data to output.
`indent`	int	Number of spaces used to indent JSON. Defaults to `2`.

`function` `srsly.read_json`

Load JSON from a file or standard input.

data = srsly.read_json("/path/to/file.json")

Argument	Type	Description
`path`	str / `Path`	The file path or `"-"` to read from stdin.
RETURNS	dict / list	The loaded JSON content.

`function` `srsly.write_gzip_json`

Create a gzipped JSON file and dump contents.

data = {"foo": "bar", "baz": 123}
srsly.write_gzip_json("/path/to/file.json.gz", data)

Argument	Type	Description
`path`	str / `Path`	The file path.
`data`	-	The JSON-serializable data to output.
`indent`	int	Number of spaces used to indent JSON. Defaults to `2`.

`function` `srsly.write_gzip_jsonl`

Create a gzipped JSONL file and dump contents.

data = [{"foo": "bar"}, {"baz": 123}]
srsly.write_gzip_json("/path/to/file.jsonl.gz", data)

Argument	Type	Description
`path`	str / `Path`	The file path.
`lines`	-	The JSON-serializable contents of each line.
`append`	bool	Whether or not to append to the location. Appending to .gz files is generally not recommended, as it doesn't allow the algorithm to take advantage of all data when compressing - files may hence be poorly compressed.
`append_new_line`	bool	Whether or not to write a new line before appending to the file.

`function` `srsly.read_gzip_json`

Load gzipped JSON from a file.

data = srsly.read_gzip_json("/path/to/file.json.gz")

Argument	Type	Description
`path`	str / `Path`	The file path.
RETURNS	dict / list	The loaded JSON content.

`function` `srsly.read_gzip_jsonl`

Load gzipped JSONL from a file.

data = srsly.read_gzip_jsonl("/path/to/file.jsonl.gz")

Argument	Type	Description
`path`	str / `Path`	The file path.
RETURNS	dict / list	The loaded JSONL content.

`function` `srsly.write_jsonl`

Create a JSONL file (newline-delimited JSON) and dump contents line by line, or write to standard output.

data = [{"foo": "bar"}, {"baz": 123}]
srsly.write_jsonl("/path/to/file.jsonl", data)

Argument	Type	Description
`path`	str / `Path`	The file path or `"-"` to write to stdout.
`lines`	iterable	The JSON-serializable lines.
`append`	bool	Append to an existing file. Will open it in `"a"` mode and insert a newline before writing lines. Defaults to `False`.
`append_new_line`	bool	Defines whether a new line should first be written when appending to an existing file. Defaults to `True`.

`function` `srsly.read_jsonl`

Read a JSONL file (newline-delimited JSON) or from JSONL data from standard input and yield contents line by line. Blank lines will always be skipped.

data = srsly.read_jsonl("/path/to/file.jsonl")

Argument	Type	Description
`path`	str / Path	The file path or `"-"` to read from stdin.
`skip`	bool	Skip broken lines and don't raise `ValueError`. Defaults to `False`.
YIELDS	-	The loaded JSON contents of each line.

`function` `srsly.is_json_serializable`

Check if a Python object is JSON-serializable.

assert srsly.is_json_serializable({"hello": "world"}) is True
assert srsly.is_json_serializable(lambda x: x) is False

Argument	Type	Description
`obj`	-	The object to check.
RETURNS	bool	Whether the object is JSON-serializable.

msgpack

📦 The underlying module is exposed via srsly.msgpack. However, we normally interact with it via the utility functions only.

`function` `srsly.msgpack_dumps`

Serialize an object to a msgpack byte string.

data = {"foo": "bar", "baz": 123}
msg = srsly.msgpack_dumps(data)

Argument	Type	Description
`data`	-	The data to serialize.
RETURNS	bytes	The serialized bytes.

`function` `srsly.msgpack_loads`

Deserialize msgpack bytes to a Python object.

msg = b"\x82\xa3foo\xa3bar\xa3baz{"
data = srsly.msgpack_loads(msg)

Argument	Type	Description
`data`	bytes	The data to deserialize.
`use_list`	bool	Don't use tuples instead of lists. Can make deserialization slower. Defaults to `True`.
RETURNS	-	The deserialized Python object.

`function` `srsly.write_msgpack`

Create a msgpack file and dump contents.

data = {"foo": "bar", "baz": 123}
srsly.write_msgpack("/path/to/file.msg", data)

Argument	Type	Description
`path`	str / `Path`	The file path.
`data`	-	The data to serialize.

`function` `srsly.read_msgpack`

Load a msgpack file.

data = srsly.read_msgpack("/path/to/file.msg")

Argument	Type	Description
`path`	str / `Path`	The file path.
`use_list`	bool	Don't use tuples instead of lists. Can make deserialization slower. Defaults to `True`.
RETURNS	-	The loaded and deserialized content.

pickle

📦 The underlying module is exposed via srsly.cloudpickle. However, we normally interact with it via the utility functions only.

`function` `srsly.pickle_dumps`

Serialize a Python object with pickle.

data = {"foo": "bar", "baz": 123}
pickled_data = srsly.pickle_dumps(data)

Argument	Type	Description
`data`	-	The object to serialize.
`protocol`	int	Protocol to use. `-1` for highest. Defaults to `None`.
RETURNS	bytes	The serialized object.

`function` `srsly.pickle_loads`

Deserialize bytes with pickle.

pickled_data = b"\x80\x04\x95\x19\x00\x00\x00\x00\x00\x00\x00}\x94(\x8c\x03foo\x94\x8c\x03bar\x94\x8c\x03baz\x94K{u."
data = srsly.pickle_loads(pickled_data)

Argument	Type	Description
`data`	bytes	The data to deserialize.
RETURNS	-	The deserialized Python object.

YAML

📦 The underlying module is exposed via srsly.ruamel_yaml. However, we normally interact with it via the utility functions only.

`function` `srsly.yaml_dumps`

Serialize an object to a YAML string. See the ruamel.yaml docs for details on the indentation format.

data = {"foo": "bar", "baz": 123}
yaml_string = srsly.yaml_dumps(data)

Argument	Type	Description
`data`	-	The JSON-serializable data to output.
`indent_mapping`	int	Mapping indentation. Defaults to `2`.
`indent_sequence`	int	Sequence indentation. Defaults to `4`.
`indent_offset`	int	Indentation offset. Defaults to `2`.
`sort_keys`	bool	Sort dictionary keys. Defaults to `False`.
RETURNS	str	The serialized string.

`function` `srsly.yaml_loads`

Deserialize unicode or a file object to a Python object.

data = 'foo: bar\nbaz: 123'
obj = srsly.yaml_loads(data)

Argument	Type	Description
`data`	str / file	The data to deserialize.
RETURNS	-	The deserialized Python object.

`function` `srsly.write_yaml`

Create a YAML file and dump contents or write to standard output.

data = {"foo": "bar", "baz": 123}
srsly.write_yaml("/path/to/file.yml", data)

Argument	Type	Description
`path`	str / `Path`	The file path or `"-"` to write to stdout.
`data`	-	The JSON-serializable data to output.
`indent_mapping`	int	Mapping indentation. Defaults to `2`.
`indent_sequence`	int	Sequence indentation. Defaults to `4`.
`indent_offset`	int	Indentation offset. Defaults to `2`.
`sort_keys`	bool	Sort dictionary keys. Defaults to `False`.

`function` `srsly.read_yaml`

Load YAML from a file or standard input.

data = srsly.read_yaml("/path/to/file.yml")

Argument	Type	Description
`path`	str / `Path`	The file path or `"-"` to read from stdin.
RETURNS	dict / list	The loaded YAML content.

`function` `srsly.is_yaml_serializable`

Check if a Python object is YAML-serializable.

assert srsly.is_yaml_serializable({"hello": "world"}) is True
assert srsly.is_yaml_serializable(lambda x: x) is False

Argument	Type	Description
`obj`	-	The object to check.
RETURNS	bool	Whether the object is YAML-serializable.

Project details

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explosion honnibal inesmontani

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Reason this release was yanked:

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Upload date: Mar 23, 2026
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MD5	`c45111da3e7206c62d0f43edb28aa62a`
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BLAKE2b-256	`dc14c0dd30cc8b93ce8137ff4766f743c882440ce49195fffc5d50eaeef311a6`

srsly 2.5.3

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srsly: Modern high-performance serialization utilities for Python

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function srsly.json_dumps

function srsly.json_loads

function srsly.write_json

function srsly.read_json

function srsly.write_gzip_json

function srsly.write_gzip_jsonl

function srsly.read_gzip_json

function srsly.read_gzip_jsonl

function srsly.write_jsonl

function srsly.read_jsonl

function srsly.is_json_serializable

msgpack

function srsly.msgpack_dumps

function srsly.msgpack_loads

function srsly.write_msgpack

function srsly.read_msgpack

pickle

function srsly.pickle_dumps

function srsly.pickle_loads

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function srsly.yaml_dumps

function srsly.yaml_loads

function srsly.write_yaml

function srsly.read_yaml

function srsly.is_yaml_serializable

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`function` `srsly.json_dumps`

`function` `srsly.json_loads`

`function` `srsly.write_json`

`function` `srsly.read_json`

`function` `srsly.write_gzip_json`

`function` `srsly.write_gzip_jsonl`

`function` `srsly.read_gzip_json`

`function` `srsly.read_gzip_jsonl`

`function` `srsly.write_jsonl`

`function` `srsly.read_jsonl`

`function` `srsly.is_json_serializable`

`function` `srsly.msgpack_dumps`

`function` `srsly.msgpack_loads`

`function` `srsly.write_msgpack`

`function` `srsly.read_msgpack`

`function` `srsly.pickle_dumps`

`function` `srsly.pickle_loads`

`function` `srsly.yaml_dumps`

`function` `srsly.yaml_loads`

`function` `srsly.write_yaml`

`function` `srsly.read_yaml`

`function` `srsly.is_yaml_serializable`

Algorithm	Hash digest
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MD5	`f465cf7813064b5d8a72ed07dedafbfa`
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MD5	`1a9dbc30f3a263fcf889a5f19d0151ba`
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Algorithm	Hash digest
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MD5	`c29afd6abc0494a76db63f99e0d5714e`
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Algorithm	Hash digest
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MD5	`e85c8e5b17c6421e2ae1e207796348a6`
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Algorithm	Hash digest
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MD5	`153878e5d182f423567633014c37fccd`
BLAKE2b-256	`6d4f7ab6d49e36d9cc72ee15746cabd116eb6f338be8a06c1882968ee9d6c7d7`

Algorithm	Hash digest
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MD5	`77110ddb3b2ea17a30469c6e9c387641`
BLAKE2b-256	`5ade89ca640ca1953c4612279ce515d0af35658df3c06cdb324329bc91b4a7e1`

Algorithm	Hash digest
SHA256	`8e0542d85d6b55cf2934050d6ffcb1cd76c768dcf9572e7467002cf087bb366d`
MD5	`755e41bd617e09d16fafd1c02a3a6c95`
BLAKE2b-256	`eb959b4f73b1be3692f86d72ccc131c8e50f26f824d5c8830a59390bcc5b60ef`

Algorithm	Hash digest
SHA256	`07d682679e639eb46ff7e6da4a92714f4d5ffe351d088ee66f221e9b1f8865bb`
MD5	`58ba8314ba0f6aa907c7c96878e436a3`
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Algorithm	Hash digest
SHA256	`99026bcd9cbd3211cc36517400b04ca0fc5d3e412b14daf84ee6e65f67d9a2d8`
MD5	`1bf824e4247dece8ae4d358a265d58ad`
BLAKE2b-256	`4ec9741e29f534919a944a16da4184924b1d3404c4bf60716ab2b91be771d1e3`

Algorithm	Hash digest
SHA256	`5c1ac27ae5f4bb9163c7d2c45fc8ec173aac3d92e32086d9472b326c5c6e570e`
MD5	`7bc3c1af960bdc692f213d81d857c63e`
BLAKE2b-256	`20b153591681b6ff2699a4f97b2d5552ba196eaa6a979b0873605f4c04b5f7ee`