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Description:

pygraphy 0.2.5

Pygraphy
A modern pythonic GraphQL implementation, painless GraphQL developing experience for Pythonista.

Document
See official docs.
Quick Review
All the behaviors of Pygraphy are no difference from your intuition.
import asyncio
import pygraphy
from typing import List, Optional
from starlette.applications import Starlette
import uvicorn

app = Starlette(debug=True)

class Episode(pygraphy.Enum):
NEWHOPE = 4
EMPIRE = 5
JEDI = 6

class Character(pygraphy.Interface):
"""
Character interface contains human and droid
"""
id: str
name: str
appears_in: List[Episode]

@pygraphy.field
def friends(self) -> Optional[List['Character']]:
return []

class Human(pygraphy.Object, Character):
"""
Human object
"""
home_planet: str

class Droid(pygraphy.Object, Character):
"""
Driod object
"""
primary_function: str

class Query(pygraphy.Query):

@pygraphy.field
async def hero(self, episode: Episode) -> Optional[Character]:
await asyncio.sleep(1)
return Droid(
id="2001",
name="R2-D2",
appears_in=[Episode.NEWHOPE, Episode.EMPIRE, Episode.JEDI],
primary_function="Astromech",
)

@app.route('/')
class Schema(pygraphy.Schema):
query: Optional[Query]

if __name__ == '__main__':
uvicorn.run(app, host='0.0.0.0', port=8000)

Installation
Web Server Required
pip install 'pygraphy[web]'
Standalone Model and Query Handler
pip install 'pygraphy'
Features

Clean room Pythonic schema definition system
Model definition bases on Python Dataclass
Python Asyncio support
Context management bases on Python Context Variables
Introspection and GraphQL Playground support

Comparation with GraphQL-Core(-Next)
Advantages
GraphQL-Core-Next is the official supporting implementation of GraphQL, and it is only a basic library. Generally, you should use Graphene or other wrapper libraries bases on it. Pygraphy is an integrated library that includes data mapping and model definition.
GraphQL-Core-Next is directly translated from GraphQL.js, this leads to some weird behaviors such as graphql-core-next/issues/37, and it is too tough to make a wrapper for walking around. Pygraphy rewrites the schema definition system in a more pythonic way. By using Python Metaclass, Pygraphy supports class-style schema definition naturally. There is no more inharmony between lambda function resolver (ugly Js style) and instance method resolver.
By using Context Variables which is added into Python in version 3.7, Pygraphy does not need to pass context through the call chain like graphql-core-next.
Also, Pygraphy is faster than graphql-core-next, you can check benchmark results as below.
And more, Pygraphy clearly support stateful subscription method with Python Asynchronous Generators, which is not elaborate in graphql-core-next.
Disadvantages
Pygraphy is still in pre-alpha version, and need stable, welcome feedback.
Pygraphy does not support full features of GraphQL according to Spec right now, the rest part of Spec will be integrated literally in the future, it contains

Derectives
ID Scalar
Type Extensions
Some Validation Check

Most of features are already implemented so do not panic.
Benchmark
Compare with Strawberry / graphql-core-next, Pygraphy is 4.5 times faster than it.
↳ uname -a
Darwin Workstation.local 19.0.0 Darwin Kernel Version 19.0.0: Thu Jul 11 18:37:36 PDT 2019; root:xnu-6153.0.59.141.4~1/RELEASE_X86_64 x86_64
↳ python -V
Python 3.7.2
↳ time python benchmark/test_pygraphy.py
python benchmark/test_pygraphy.py 3.48s user 0.10s system 99% cpu 3.596 total
↳ time python benchmark/test_strawberry.py
python benchmark/test_strawberry.py 16.05s user 0.16s system 99% cpu 16.257 total