How to access global variable in Python?

Question

I have a case :

x = "me"

class Test():    
    global x

    def hello(self):
        if x == "me":
            x = "Hei..!"
            return "success"

I try this case with shell.

How I can print x which the output/value of x is Hei..!?

I tried with

Test().hello # for running def hello
print x # for print the value of x

After I print x, the output is still me.

Answer 1

You need to use global x inside the function not class:

class Test():
    def hello(self):
        global x
        if x == "me":
            x = "Hei..!"
            return "success"

Test().hello() #Use Parenthesis to call the function.

Don't know why you want to update a global variable from class method, but one another way will be to define x as a class attribute:

class Test(object): #Inherit from `object` to make it a new-style class(Python 2)
    x = "me"
    def hello(self):
        if self.x == "me":
            type(self).x = "Hei..!"
            return "success"

Test().hello()
print Test.x