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# GQL
This is a GraphQL client for Python.
Plays nicely with `graphene`, `graphql-core`, `graphql-js` and any other GraphQL implementation
compatible with the [GraphQL specification](https://spec.graphql.org).
GQL architecture is inspired by `React-Relay` and `Apollo-Client`.
[![GitHub-Actions][gh-image]][gh-url]
[![pyversion][pyversion-image]][pyversion-url]
[![pypi][pypi-image]][pypi-url]
[![Anaconda-Server Badge][conda-image]][conda-url]
[![codecov][codecov-image]][codecov-url]
[gh-image]: https://github.com/graphql-python/gql/workflows/Tests/badge.svg
[gh-url]: https://github.com/graphql-python/gql/actions?query=workflow%3ATests
[pyversion-image]: https://img.shields.io/pypi/pyversions/gql
[pyversion-url]: https://pypi.org/project/gql/
[pypi-image]: https://img.shields.io/pypi/v/gql.svg?style=flat
[pypi-url]: https://pypi.org/project/gql/
[conda-image]: https://img.shields.io/conda/vn/conda-forge/gql.svg
[conda-url]: https://anaconda.org/conda-forge/gql
[codecov-image]: https://codecov.io/gh/graphql-python/gql/branch/master/graph/badge.svg
[codecov-url]: https://codecov.io/gh/graphql-python/gql
## Documentation
The complete documentation for GQL can be found at
[gql.readthedocs.io](https://gql.readthedocs.io).
## Features
* Execute GraphQL queries using [different protocols](https://gql.readthedocs.io/en/latest/transports/index.html):
* http
* websockets:
* apollo or graphql-ws protocol
* Phoenix channels
* AWS AppSync realtime protocol (experimental)
* Possibility to [validate the queries locally](https://gql.readthedocs.io/en/latest/usage/validation.html) using a GraphQL schema provided locally or fetched from the backend using an instrospection query
* Supports GraphQL queries, mutations and [subscriptions](https://gql.readthedocs.io/en/latest/usage/subscriptions.html)
* Supports [sync](https://gql.readthedocs.io/en/latest/usage/sync_usage.html) or [async](https://gql.readthedocs.io/en/latest/usage/async_usage.html) usage, [allowing concurrent requests](https://gql.readthedocs.io/en/latest/advanced/async_advanced_usage.html#async-advanced-usage)
* Supports [File uploads](https://gql.readthedocs.io/en/latest/usage/file_upload.html)
* Supports [Custom scalars / Enums](https://gql.readthedocs.io/en/latest/usage/custom_scalars_and_enums.html)
* Supports [Batching requests](https://gql.readthedocs.io/en/latest/advanced/batching_requests.html)
* [gql-cli script](https://gql.readthedocs.io/en/latest/gql-cli/intro.html) to execute GraphQL queries or download schemas from the command line
* [DSL module](https://gql.readthedocs.io/en/latest/advanced/dsl_module.html) to compose GraphQL queries dynamically
## Installation
You can install GQL with all the optional dependencies using pip:
```bash
# Quotes may be required on certain shells such as zsh.
pip install "gql[all]"
```
> **NOTE**: See also [the documentation](https://gql.readthedocs.io/en/latest/intro.html#less-dependencies) to install GQL with less extra dependencies depending on the transports you would like to use or for alternative installation methods.
## Usage
### Sync usage
```python
from gql import Client, gql
from gql.transport.aiohttp import AIOHTTPTransport
# Select your transport with a defined url endpoint
transport = AIOHTTPTransport(url="https://countries.trevorblades.com/")
# Create a GraphQL client using the defined transport
client = Client(transport=transport)
# Provide a GraphQL query
query = gql(
"""
query getContinents {
continents {
code
name
}
}
"""
)
# Execute the query on the transport
result = client.execute(query)
print(result)
```
Executing the above code should output the following result:
```
$ python basic_example.py
{'continents': [{'code': 'AF', 'name': 'Africa'}, {'code': 'AN', 'name': 'Antarctica'}, {'code': 'AS', 'name': 'Asia'}, {'code': 'EU', 'name': 'Europe'}, {'code': 'NA', 'name': 'North America'}, {'code': 'OC', 'name': 'Oceania'}, {'code': 'SA', 'name': 'South America'}]}
```
> **WARNING**: Please note that this basic example won't work if you have an asyncio event loop running. In some
> python environments (as with Jupyter which uses IPython) an asyncio event loop is created for you. In that case you
> should use instead the [async usage example](https://gql.readthedocs.io/en/latest/usage/async_usage.html#async-usage).
### Async usage
```python
import asyncio
from gql import Client, gql
from gql.transport.aiohttp import AIOHTTPTransport
async def main():
# Select your transport with a defined url endpoint
transport = AIOHTTPTransport(url="https://countries.trevorblades.com/graphql")
# Create a GraphQL client using the defined transport
client = Client(transport=transport)
# Provide a GraphQL query
query = gql(
"""
query getContinents {
continents {
code
name
}
}
"""
)
# Using `async with` on the client will start a connection on the transport
# and provide a `session` variable to execute queries on this connection
async with client as session:
# Execute the query
result = await session.execute(query)
print(result)
asyncio.run(main())
```
## Contributing
See [CONTRIBUTING.md](CONTRIBUTING.md)
## License
[MIT License](https://github.com/graphql-python/gql/blob/master/LICENSE)
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