Question

Given the following in the same script:

class ClassA:
    def GetExpBidBrice():
        global x
        x ='abc'

    def GetExpAskPrice():
        y = x + 'zyz'

class ClassB:
    def GetExpBidBrice():
        x = 123

    def GetExpAskPrice():
        y = x + 'zyz'

Does the global in ClassA.GetExpBidPrice() make x global just to the other method in ClassA? Or does it make it global right across the board i.e. in ClassB or any other class that uses a variable called x?

Answer 1

The variable is made global in the current code block only. From the global statement documentation:

The global statement is a declaration which holds for the entire current code block. It means that the listed identifiers are to be interpreted as globals. It would be impossible to assign to a global variable without global, although free variables may refer to globals without being declared global.

The variable x in other methods is unaffected. It’ll only be a global in the ClassA.GetExpBidBrice() method.

If you wanted it to be a global in the other methods as well (ClassA.GetExpAskPrice(), ClassB.GetExpBidBrice() and ClassB.GetExpAskPrice()) then you’d need to declare x a global in each method separately.