launchdarkly_python_sdk_feature_flag_evaluation_quickstart.py

1import ldclient
2from ldclient.config import Config
3import time
4
5# Set sdk_key to your LaunchDarkly SDK key
6sdk_key = "YOUR_SDK_KEY"
7
8# Set feature_flag_key to the feature flag key you want to evaluate
9feature_flag_key = "sample-feature-flag-key"
10
11def show_message(s):
12    print("*** %s" % s)
13    print()
14
15if __name__ == "__main__":
16    if not sdk_key:
17        show_message("Please edit main.py to set sdk_key to your LaunchDarkly SDK key first")
18        exit()
19
20    ldclient.set_config(Config(sdk_key))
21
22    if ldclient.get().is_initialized():
23        show_message("SDK successfully initialized!")
24    else:
25        show_message("SDK failed to initialize")
26        exit()
27
28    # Set up the context properties. This context should appear on your
29    # LaunchDarkly contexts dashboard soon after you run the gateway.
30    context = {
31        "kind": "user",
32        "key": "example-user-key",
33        "name": "Sandy"
34    }
35
36    flag_value = ldclient.get().toggle(feature_flag_key, context, False)
37
38    show_message("Feature flag '%s' is %s for this context" % (feature_flag_key, flag_value))
39
40    # Here we ensure that the SDK shuts down cleanly and has an opportunity
41    # to deliver events to LaunchDarkly before the program exits. If this
42    # were a multi-threaded server application, you would certainly not want
43    # to do this after every request—instead, you would do it when your
44    # application is about to terminate.
45    ldclient.get().close()