Global static variables in Python

Question

def Input():
    c = raw_input ('Enter data1,data2: ')
    data = c.split(',')
    return data

I need to use list data in other functions, but I don't want to enter raw_input everytime. How I can make data like a global static in c++ and put it everywhere where it needed?

You might consider not using these kind of global variables (hard dependencies), because they can make problems with testing and separation. — tamasd
– tamasd, Commented Sep 12, 2010 at 11:27
You can use data = raw_input('Enter data1,data2: ').split(',') — Lord British
– Lord British, Commented Sep 12, 2010 at 11:55

Sameer Alibhai · Accepted Answer · 2021-07-10 16:40:27Z

18

Add the global keyword to your function:

def Input():
    global data
    c = raw_input ('Enter data1,data2: ')
    data = c.split(',')
    return data

The global data statement is a declaration that makes data a global variable. After calling Input() you will be able to refer to data in other functions.

edited Jul 10, 2021 at 16:40

Sameer Alibhai

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answered Sep 12, 2010 at 11:10

Greg Hewgill

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2 Comments

Lord British Over a year ago

If data is global do you need the line return data ?

Arpan Saini Over a year ago

Python gives an error when you define global variable from a function, if define at global level it doesn't get updated from a method.

Ivo van der Wijk · Accepted Answer · 2010-09-12 12:31:33Z

4

using global variables is usually considered bad practice. It's better to use proper object orientation and wrap 'data' in a proper class / object, e.g.

class Questionaire(object):
    def __init__(self):
        self.data = ''

    def input(self):
        c = raw_input('Enter data1, data2:')
        self.data = c.split(',')

    def results(self):
        print "You entered", self.data

q = Questionaire()
q.input()
q.results()

answered Sep 12, 2010 at 12:31

Ivo van der Wijk

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