environment

python 3.7.0
Flask 1.0.2

First SOURCE

API that just receives and returns bool type ʻis_hoge` in request

`hoge.py`


from flask import Flask, request
app = Flask(__name__)

@app.route("/", methods=['GET'])
def hello():
    is_hoge = request.args.get('is_hoge', type=bool)
    return f'{ is_hoge }'

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

Expected value

--If you send true, True --If you send false, False --If you send 0, False

Execution result

--If you send true スクリーンショット 2019-11-19 15.21.06.png --If you send false スクリーンショット 2019-11-19 15.21.31.png --If you send 0 スクリーンショット 2019-11-19 15.21.55.png

What do you mean? As a result of all, True is returned. As a consideration of newcomer paper, I think that all of them were regarded as character strings and True was returned.

I want to be able to use it as a Boolean somehow

It seems that python has a convenient function called strtobool (), and I will use this.

`converter.py`


from distutils.util import strtobool

def convert_to_bool(target_object, default_val):
    if target_object is None:
        return default_val
    try:
        return strtobool(target_object)
    except:
        return default_val

When the value brought in as an argument is None or when an exception occurs, default_val is returned.

`hoge.py`


    is_hoge = converter.convert_to_bool(request.args.get('is_hoge'), False)

Run again

--If you send true スクリーンショット 2019-11-19 15.50.35.png

--If you send false スクリーンショット 2019-11-19 15.50.21.png

--If you send 0 スクリーンショット 2019-11-19 15.48.14.png

0s and 1s are now returned. If it is a judgment of the truth value of a numerical value, 0 is False, and other than 0 is True, so I think there is no problem!