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# 2.0.0 Migration Guide
The 2.0 release of `google-api-python-client` includes a substantial reliability
improvement, compared with 1.x, as discovery documents are now cached in the library
rather than fetched dynamically. It is highly recommended to upgrade from v1.x to v2.x.
Only python 3.6 and newer is supported. If you are not able to upgrade python, then
please continue to use version 1.x as we will continue supporting python 2.7+ in
[v1](https://github.com/googleapis/google-api-python-client/tree/v1).
Discovery documents will no longer be retrieved dynamically when
you call `discovery.build()`. The discovery documents will instead be retrieved
from the client library directly. New versions of this library are released weekly.
As a result of caching the discovery documents, the size of this package is at least
50 MB larger compared to the previous version.
For users of public APIs
------------------------
Existing code written for earlier versions of this library will not require
updating.
For users of private APIs
-------------------------
If the discovery document requires an authentication key to access it then the
discovery document is private and it will not be shipped with the library.
Only discovery documents listed in [this public directory](https://www.googleapis.com/discovery/v1/apis/)
are included in the library. Users of private APIs should set the
`static_discovery` argument of `discovery.build()` to `False` to continue to
retrieve the service definition from the internet. As of version 2.1.0,
for backwards compatibility with version 1.x, if `static_discovery` is not
specified, the default value for `static_discovery` will be `True` when
the `discoveryServiceUrl` argument of `discovery.build()` is provided.
If you experience issues or have questions, please file an [issue](https://github.com/googleapis/google-api-python-client/issues).
## Supported Python Versions
> **WARNING**: Breaking change
The 2.0.0 release requires Python 3.6+, as such you must upgrade to Python 3.6+
to use version 2.0.0.
## Method Calls
**Note**: Existing code written for earlier versions of this library will not
require updating. You should only update your code if you are using an API
which does not have a public discovery document.
> **WARNING**: Breaking change
The 2.0 release no longer retrieves discovery documents dynamically on each
call to `discovery.build()`. Instead, discovery documents are retrieved from
the client library itself.
Under the hood, the `discovery.build()` function retrieves a discovery artifact
in order to construct the service object. The breaking change is that the
`discovery.build()` function will no longer retrieve discovery artifacts
dynamically. Instead it will use service definitions shipped in the library.
**Before:**
```py
from googleapiclient.discovery import build
# Retrieve discovery artifacts from the internet
with build('drive', 'v3') as service:
# ...
```
**After:**
```py
from googleapiclient.discovery import build
# Retrieve discovery artifacts from the client library
with build('drive', 'v3') as service:
# ...
# Retrieve discovery artifacts from the internet for a private API
with build('drive', 'v3', static_discovery=False, developerKey=XXXXX) as service:
# ...
```
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