How to Access Function variables in Another Function

I have a small issue while calling multiple variables in python one function to another. Like I have to access the variable of xxx() variables in yyy(). Help me to do this.?

Example :

def xxx():
        a=10
        b=15
        c=20

def yyy():
        xxx()
        print a        ### value a from xxx()
        print b        ### value b from xxx()

yyy()

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

Return them from your first function and accept them in your second function. Example –

def xxx():
    a=10
    b=15
    c=20
    return a,b

def yyy():
    a,b = xxx()
    print a        ### value a from xxx()
    print b        ### value b from xxx()

yyy()

Method 2

You can’t. Variables created in a function are local to that function. So if you want function yyy to get the values of some variables defined in function xxx then you need to return them from xxx, as demonstrated in Sharon Dwilif K’s answer. Note that the names of the variables in yyy are irrelevant; you could write:

def yyy():
    p, q = xxx()
    print p        ### value a from xxx()
    print q        ### value b from xxx()

and it would give the same output.

Alternatively, you could create a custom class. Briefly, a class is a collection of data together with functions that operate on that data. Functions of a class are called methods, the data items are known as attributes. Each method of a class can have its own local variables, but it can also access the attributes of the class. Eg

class MyClass(object):
    def xxx(self):
        self.a = 10
        self.b = 15
        self.c = 20

    def yyy(self):
        self.xxx()
        print self.a
        print self.b

#Create an instance of the class
obj = MyClass()

obj.yyy()

output

10
15

Please see the linked documentation for more information about classes in Python.

Method 3

Try this:

def xxx():
    a=10
    b=15
    c=20
    return a, b

def yyy():
    a, b = xxx()
    print a
    print b

yyy()

Or this:

def xxx():
    global a, b
    a=10
    b=15
    c=20

def yyy():
    print a
    print b

xxx()
yyy()

For more info, use help('return') and help('global'), or see this and this question.

And only use global when you need the variable can use at everywhere or you need the function return other things. Because modifying globals will breaks modularity.

Method 4

The answers people gave above are correct. But from a design perspective this is not something correct. Method local variables are mean to be local. If at all there is something that needs to be shared across a file or some set of methods I suggest you use file level variables or constants.

Method 5

Use the global keyword, like the following example:

global a=0
global b=0
global c=0

def xxx():
    a=10
    b=15
    c=20
    return a,b

def yyy():
    print a
    print b 
    xxx()

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0