Sesame HTTP: Installation of Flask

Flask is a lightweight web service program, which is simple, easy to use, and flexible. It is mainly used for some API services here.

1. Related Links

• GitHub：https://github.com/pallets/flask
• Official documentation: http://flask.pocoo.org
• Chinese documentation: http://docs.jinkan.org/docs/flask
• PyPI：https://pypi.python.org/pypi/Flask

2. pip install

It is recommended to use pip to install, the command is as follows:

pip3 install flask

After running, the installation is complete.

3. Verify the installation

After the installation is successful, you can run the following sample code to test:

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

if __name__ == "__main__":
    app.run()

It can be found that the system will open the web service on port 5000, and the console output is as follows:

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

Directly visit http://127.0.0.1:5000/ , you can observe that Hello World! is displayed in the web page, as shown in Figure 1-41, the simplest Flask program runs successfully.

Figure 1-41 Running result

4. Conclusion

Later, we will use Flask+Redis to maintain the dynamic proxy pool and Cookies pool.