How to create an object of another class in Flask only once

Asked Jun 13 '17 at 16:14

Active Jun 13 '17 at 16:29

Viewed 20 times

I am using flask for serving a post request. I have the following code:

from flask import Flask
from flask import request
from another_file import Another_Class_Somewhere_Else

app = Flask(__name__)
od = ""

@app.route("/call_my_func", methods=['GET', 'POST'])
def hello(): 
    res = od.some_func()
    return res

if __name__ == "__main__":
    global od
    my_param = "dummy_string"
    od = Another_Class_Somewhere_Else(my_param)
    app.run(debug=True, host='10.0.10.15')

As you can see above, my objective is to create an object of another class only once. Then use this object to run a method of the another class every time we get a post request?

What is wrong with the method above because it doesn't seem to create the object once.

asked Jun 13 '17 at 16:14

London guy

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You want to use your class per application or per request? – Andrejs Cainikovs Jun 13 '17 at 16:17
How do you know that there more than one object? – vZ10 Jun 13 '17 at 16:19
@AndrejsCainikovs I would like to create an object of the class only once. Once per application. Then for every reqyest it is ok to use the same object – London guy Jun 13 '17 at 16:21
@vZ10 I get a warning right now that od is being used before it is initialized or something like that. – London guy Jun 13 '17 at 16:21
If you want help, you need to be more specific than "or something like that". What, *exactly*, is the error message? – Daniel Roseman Jun 13 '17 at 16:23
1

Maybe try ```global od = ""``` and remove the ```global od``` from the main loop. – Jack Parkinson Jun 13 '17 at 16:23
@ISOmetric yes thanks, doing what you suggested solves the problem and removes the unnecesary warning. – London guy Jun 13 '17 at 16:39

How to create an object of another class in Flask only once

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