函数调用自身时全局丢失

Question

I need to add a variable "a" to global variables at runtime and be able to recover it anytime from the Item class. Result: I can't see it in the global variables.

Below there is an example. When I print the globals() I don't find the new "a" variable.

Specifically I need to be able to save the printVal result in a variable called "a", which I can consult in next call to this function.

In my final program I plan to add as many different variables as I want (variable and value).

Example:

class Item():
    def printVal(self,value):
        return value

    def func(self):
        userInput = input("Input string:")
        if userInput!="0":
            exec("a=self.printVal(\""+userInput+"\")",globals(),locals())
        else:
            return
        print(globals())
        self.func()

if __name__ == "__main__":
    item = Item()
    item.func()

Answer 1

If you jus watn to set a global variable with a name generated at runtime you do:

globals()[name] = val

by the way printVal method is dummy. Just return whtat it gets.