Data type of GET attributes


I was reading [a link]<a href="http://flask.pocoo.org/docs/quickstart/#the-request-object" rel="nofollow">http://flask.pocoo.org/docs/quickstart/#the-request-object</a> [a link]

If I have an html which consists of a form which has an element as:

<input type="text" id = 2 name="box"></input>

And I am using Flask app to get this dat in a GET request. from the documentation I came to know I can use

searchword = request.args.get('box', '')

I want to know what is the data type of searchwork , Is it an object. If it is an object is there a way I can convert it to an integer or string because I have a function which takes an integer and I want to pass the searchword there.


Just build a simple app and you can get your answer.

from flask import request, Flask app = Flask(__name__) @app.route('/', methods=['POST', 'GET']) def home(): key = request.args.get('key', '') return 'key is `%s`, type(key) is %s\n' % (key, type(key)) if __name__ == '__main__': app.run()

Now run it.

$ wget -qO - 'http://localhost:5000/?key=value' key is `value`, type(key) is <type 'unicode'>

If you want to convert that into an integer, you definitely want some kind of fallback. So incorporating the other answer, you can do something like this

return 'key is `%s`, type(key) is %s, key.isdigit() is %s\n' % ( key, type(key), key.isdigit())

Trying this:

$ wget -qO - 'http://localhost:5000/?key=value' key is `value`, type(key) is <type 'unicode'>, key.isdigit() is False $ wget -qO - 'http://localhost:5000/?key=123' key is `123`, type(key) is <type 'unicode'>, key.isdigit() is True

Then you can use the appropriate methods to handle your success and failure conditions, and use int(value) to cast value into an int.


You can apply <a href="http://docs.python.org/2/library/stdtypes.html#str.isdigit" rel="nofollow">isdigit()</a> check:

searchword = request.args.get('box', '') if searchword.isdigit(): my_function(int(searchword))

Or, just <a href="http://docs.python.org/2/glossary.html" rel="nofollow">"ask for forgiveness"</a>:



Easier to ask for forgiveness than permission. This common Python coding style assumes the existence of valid keys or attributes and catches exceptions if the assumption proves false. This clean and fast style is characterized by the presence of many try and except statements.

</blockquote> searchword = request.args.get('box', '') try: my_function(int(searchword)) except ValueError: pass

Hope that helps.


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