Python 3 - need from exec() to return values

Question

I have a small problem with exec(). I have string from Kivy GUI which I need to execute and store values from the executed code.

class gui(BoxLayout):
    def proces(self):
        t = threading.Thread(target=self.graf)
        t.daemon = True
        t.start()

    def graph(self):

        CodeInput=self.ids.codas
        Code=CodeInput.text
        x, y = [], []
        exec(Code)
        print(x,y) # empty list prints
        # then x y will serve for plotting a graph

This is a string inside the 'Code':

def values():
    x=np.linspace(0,3.14,100)
    y=np.sin(x)
    print(x) # of course works
    return x,y
x,y=values()

Everything WORKS except I cant get the values x,y from exec(Code). Its like exec() is totaly separate operation that can be started but cannot be entered.

Daniel · Accepted Answer · 2016-08-07 20:06:50Z

13

You should call exec with a local namespace:

loc = {}
exec(Code, {}, loc)
x = loc['x']
y = loc['y']

answered Aug 7, 2016 at 20:06

Daniel

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