我如何让这个 python 函数返回一个值？

Question

I have a file which I'm reading in python(test.txt). Sample file contents are as follows.

cool let's/cool
hi let's/hi
somek let's/somek

I'm searching for cool and if it exists in this file i'm trying to fetch the value let's/cool

I have tried this

file = open('test.txt')
my_value='cool'

def test_function(my_value):
    for line in file:
        #fields = line.strip().split()
        if line.find(my_value) != -1:
            ddda=line.rsplit(" ",1)[1]

            print(ddda)  ###This is giving my value let's/cool

while true:
    b=test_function(my_value)
    print(b) ##not able to fetch the value of ddda here

How do I store the value of ddda in my while loop. Is there a better way of doing things without using function? I'm not using any external modules.

Answer 1

print(ddda)  ###This is giving my value let's/cool

This is not giving you anything. It is printing . If you want to return a value, then return it, not print it.

return ddda

Doing this will allow you to print(b) .

Answer 2

Well, return that value:

print(ddda)
return ddda