Launchdarkly-server-sdk

Added:
- Added the `alias` method to `LDClient`. This can be used to associate two user objects for analytics purposes with an alias event.

Fixed:
- The SDK could fail to send debug events when event debugging was enabled on the LaunchDarkly dashboard, if the application server&39;s time zone was not GMT.

Fixed:
- The logic for detecting uWSGI did not account for undocumented behavior in some environments where the `uwsgi` module is present in an incomplete state; this could cause an error on startup in such environments. Also, the log message about threading options related to uWSGI contained a broken link. (Thanks, [andrefreitas](https://github.com/launchdarkly/python-server-sdk/pull/148)!)

This major release is for Python compatibility updates and removal of deprecated APIs. It introduces no new functionality except type hints.

Added:
- Added [type hints](https://docs.python.org/3/library/typing.html) to all SDK methods. Python by itself does not enforce these, but commonly used development tools can provide static checking to trigger warnings or errors if the wrong type is used.

Changed:
- Python 2.7, 3.3, and 3.4 are no longer supported. The minimum Python version is now 3.5.
- The first parameter to the `Config` constructor, `sdk_key`, is now required. Previously it was possible to omit the `sdk_key` from the `Config` and specify it separately when initializing the SDK. Now, it is always in the `Config`.

Removed:
- Removed `ldclient.set_sdk_key()`. The correct way to do this now, if you are using the singleton client method `ldclient.get()`, is to call `ldclient.set_config()` with a `Config` object that contains the SDK key.
- Removed the optional SDK key parameter from the [`LDClient`](https://launchdarkly-python-sdk.readthedocs.io/en/latest/api-main.html#ldclient.client.LDClient) constructor. You must now provide a configuration parameter of type [`Config`](https://launchdarkly-python-sdk.readthedocs.io/en/latest/api-main.html#ldclient.config.Config), and set the SDK key within the `Config` constructor: `LDClient(Config(sdk_key = "my-sdk-key", [any other config options]))`. Previously, it was possible to specify the SDK key as a single string parameter and omit the `Config` object—`LDClient("my-sdk-key")`—although this would cause a deprecation warning to be logged; specifying both a key and a `Config` was always an error.
- Removed the individual HTTP-related parameters such as `connect_timeout` from the [`Config`](https://launchdarkly-python-sdk.readthedocs.io/en/latest/api-main.html#ldclient.config.Config) type. The correct way to set these now is with the [`HTTPConfig`](https://launchdarkly-python-sdk.readthedocs.io/en/latest/api-main.html#ldclient.config.HTTPConfig) sub-configuration object: `Config(sdk_key = "my-sdk-key", http = HTTPConfig(connect_timeout = 10))`.
- Removed all other types, parameters, and methods that were deprecated as of the last 6.x release.

Fixed:
- The SDK could fail to send debug events when event debugging was enabled on the LaunchDarkly dashboard, if the application server&39;s time zone was not GMT.

Fixed:
- The SDK was not recognizing proxy authorization parameters included in a proxy URL (example: `http://username:passwordproxyhost:port`). It will now use these parameters if present, regardless of whether you set the proxy URL programmatically or in an environment variable. (Thanks, [gangeli](https://github.com/launchdarkly/python-server-sdk/pull/145)!)