i don't understand how to use a variable outside of a function?

i don't understand how to use a variable outside of a function? - Printable Version

+- Python Forum (https://python-forum.io)
+-- Forum: Python Coding (https://python-forum.io/forum-7.html)
+--- Forum: General Coding Help (https://python-forum.io/forum-8.html)
+--- Thread: i don't understand how to use a variable outside of a function? (/thread-5371.html)

i don't understand how to use a variable outside of a function? - Rius2 - Sep-30-2017

from this function:

def test(arg)
a = 0
if arg >3:
    a=1
return a

how do i use it in another function?:

def main():
    arg = rand.randrange(0,7)
    test(arg)
    if a = 1:
        print('I don't know what i'm doing')

RE: i don't understand how to use a variable outside of a function? - Larz60+ - Sep-30-2017

Pass as an attribute

>>> def func1():
...     return 15
...
>>> def func2(value):
...     print('Value x 2 = {}'.format(value * 2))
...
>>> def main():
...     a = func1()
...     func2(a)
...
>>> main()
Value x 2 = 30

RE: i don't understand how to use a variable outside of a function? - buran - Sep-30-2017

based on your code:

import random

def test(arg):
    if arg > 3:
        a = 1
    else:
        a = 0
    return a

def main():
    arg = random.randrange(0,7)
    a = test(arg) # here you can use any name, not neccessary to be a
    if a == 1:
        print("I don't know what i'm doing")

more pythonic would be

import random
def test(arg):
    return arg >3

def main():
    arg = random.randrange(0,7)
    if test(arg):
        print("I don't know what i'm doing")

also note the double quotes of the string - otherwise you need to escape the single quotes

RE: i don't understand how to use a variable outside of a function? - Rius2 - Sep-30-2017

so in my case it would be:

def test(arg)
    a = 0
    if arg > 5:
        a = 1
   return a

def main():
    arg = random.randrange
    z = test(arg)
    if z ==1:
        Print('Will this work?')

Thank both of you , now i think i can grasp functions.

RE: i don't understand how to use a variable outside of a function? - buran - Sep-30-2017

here is our tutorial https://python-forum.io/Thread-Basic-Functions

RE: i don't understand how to use a variable outside of a function? - nilamo - Oct-04-2017

(Sep-30-2017, 08:16 PM)Rius2 Wrote: so in my case it would be:
arg = random.randrange

Well, no. You never call random.randrange, so arg is just a reference to the function itself. So "Will this work" should never be printed.

RE: i don't understand how to use a variable outside of a function? - wavic - Oct-04-2017

Any function returns an object which you can assign to a variable.
So you define one. Simplified because I am lazy today:

def test(arg):
    return a

Then define another:

def second(some_argument):
    b = test(some_argument)
    if b != 'stupid example':
        return 'Good enough'

Now call 'second':

s = 'No?'
second(s)

You can pass any argument to a function and use it inside another one. some_argument could be any python object, however, it is called. Of course, its type has to be suitable to use it at all.