dsviper — Digital Substrate Viper Runtime

dsviper is the Python extension module for Viper, a C++ runtime built around metadata-driven type and value systems. It provides a seamless bidirectional bridge between Python and Viper's strong-typed data model.

Key Features

Type & Value System — Dynamically construct types and instantiate strong-typed values with automatic Python ↔ C++ bridging.
Commit Database — Versioned persistence with full mutation history (DAG of commits).
Definitions — Define data models programmatically: concepts, structures, enumerations, attachments.
Blob System — BlobArray with zero-copy NumPy integration, BlobPack for structured binary data.
Codecs — Stream binary and JSON serialization for all Viper types.

Quick Start

from dsviper import *

# Strong-typed value system
names = Value.create(TypeVector(Type.STRING))
names.extend(["alice", "bob"])
print(names)  # ['alice', 'bob']
print(names.type())  # vector<string>

names.append(42)  # ViperError: expected 'str', got 'int'

Commit Database

A complete example — define a model, create a versioned database, commit and query:

from dsviper import *

# Define a model dynamically
defs = Definitions()
ns = NameSpace(ValueUUId.create(), "App")
t_User = defs.create_concept(ns, "User")
d_Profile = TypeStructureDescriptor("Profile")
d_Profile.add_field("name", Type.STRING)
a_profile = defs.create_attachment(ns, "profile", t_User,
                                   defs.create_structure(ns, d_Profile))

# Create a versioned database and commit data
db = CommitDatabase.create_in_memory()
db.extend_definitions(defs.const())

key = a_profile.create_key()
doc = a_profile.create_document()
doc.name = "Alice"

mutable = CommitMutableState(CommitStateBuilder.initial_state(db))
mutable.attachment_mutating().set(a_profile, key, doc)
db.commit_mutations("Add Alice", mutable)

# Query
state = CommitStateBuilder.state(db, db.last_commit_id())
state.attachment_getting().get(a_profile, key)
# Optional({name='Alice'})

Installation

pip install dsviper

Requires Python ≥ 3.10. Pre-built wheels are provided for all supported platforms.

Supported Platforms

Platform	3.10	3.11	3.12	3.13	3.14
Linux x86_64	✅	✅	✅	✅	✅
Linux aarch64	✅	✅	✅	✅	✅
macOS arm64 (Apple Silicon)	✅	✅	✅	✅	✅
macOS x86_64 (Intel)	✅	✅	✅	✅	✅
Windows x64	✅	✅	✅	✅	✅
Windows arm64	—	✅	✅	✅	✅

Documentation

Full documentation at docs.digitalsubstrate.io/dsviper-python

License

Proprietary — Commercial license required. Contact Digital Substrate for licensing information.

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Release history Release notifications | RSS feed

1.2.24

Aug 4, 2026

1.2.23

Jul 23, 2026

1.2.22

Jul 22, 2026

1.2.21

Jul 20, 2026

This release

1.2.20

Jul 13, 2026

1.2.19

Jul 7, 2026

1.2.18

Jul 3, 2026

1.2.17

Jun 28, 2026

1.2.16

Jun 13, 2026

1.2.15

Jun 11, 2026

1.2.14

Jun 10, 2026

1.2.13

Jun 4, 2026

1.2.12

Jun 1, 2026

1.2.11

May 30, 2026

1.2.10

May 11, 2026

1.2.9

May 8, 2026

1.2.8

May 3, 2026

1.2.7

Apr 22, 2026

1.2.5

Mar 25, 2026

1.2.0.post3 yanked

Mar 23, 2026

Reason this release was yanked:

documentation is missing due to regression

1.2.0.post2 yanked

Mar 21, 2026

Reason this release was yanked:

Releases issues (macos x86 & linux)

1.2.0.post1 yanked

Mar 21, 2026

Reason this release was yanked:

release issue

1.2.0 yanked

Mar 20, 2026

Reason this release was yanked:

missing long project description

dsviper 1.2.20

dsviper — Digital Substrate Viper Runtime

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