What is feature flag in DevOps?
Feature flags (called feature toggles by some) are a software development and delivery technique that allows software teams to enable and disable parts of a codebase at the flip of a switch. DevOps practices also allow teams to go fast while maintaining product quality and infrastructural reliability.
Should you use feature flags?
Feature flagging allows companies to continuously deliver and deploy software to their users in a faster way. The use of feature flags allows companies to perform gradual feature rollouts, fix bugs in the code without redeploying, experience a more streamlined development cycle and do rollbacks of code more easily.
What is the purpose of feature toggle?
What is a feature toggle? In software development, a feature toggle is a mechanism that allows code to be turned “on” or “off” remotely without the need for a deploy. Feature toggles are commonly used by product, engineering, and DevOps teams for canary releases, A/B testing, and continuous deployment.
Why flag is used in Python?
A flag in Python acts as a signal to the program to determine whether or not the program as a whole or a specific section of the program should run. In other words, you can set the flag to True and the program will run continuously until any type of event makes it False.
Does Google Use feature flags?
Feature flags/toggles/controls are a software development best practice of gating functionality, used by companies like Google and Facebook. Functionality can be deployed “off”, then turned on via the feature flag, separate from deployment.
How to create a command line interface in flask?
Commands added using the Flask app’s cli command() decorator will be executed with an application context pushed, so your command and extensions have access to the app and its configuration. If you create a command using the Click command() decorator instead of the Flask decorator, you can use with_appcontext() to get the same behavior.
How does a feature flag work in a program?
The flag typically wraps a block of code that encapsulates a feature capability. The state of the flag determines whether that code block executes for a given user. Figure 10-11 shows the implementation.
How to write a configuration value in flask?
The config is actually a subclass of a dictionary and can be modified just like any dictionary: app = Flask(__name__) app.config[‘TESTING’] = True Certain configuration values are also forwarded to the Flask object so you can read and write them from there:
How does the debug mode work in flask?
It is controlled with the FLASK_ENV environment variable and defaults to production. Setting FLASK_ENV to development will enable debug mode. flask run will use the interactive debugger and reloader by default in debug mode. To control this separately from the environment, use the FLASK_DEBUG flag.