https://forum.omz-software.com/topic/4030/pure-python-external-libs

@Bjucha If the four line test_loc.py above prints None then please try rebooting your iOS device.

What iOS version? What Pythonista version?

Filesnames that end in .py are treated differently than all other files to be compliant with Apple's app review guidelines which put constraints on executable code. The workaround is to rename your file my_file.p (removing the y) on your Mac before emailing it and then on your iOS device, add the y back onto the end of the filename.

Do you have Settings / Privacy / Location Services turned on? Is Pythonista's access to those location services also turned on?

# loc_test.py
import location
location.start_updates()
print(location.get_location())
location.stop_updates()

Just change def getLocation(): to def getLocation(sender):

ui.actions take a parameter which is usually called sender. In this case, Pythonista will set sender to be button1, i.e. the ui element that the user selected.

import location
import ui


def getLocation(sender):
    location.start_updates()
    label1.text = str(location.get_location())
    location.stop_updates()


label1 = ui.Label(border_width=1, frame=(100, 0, 500, 200), number_of_lines=0)
main_view = ui.View(name='Location', bg_color='#bfff8e')
main_view.add_subview(label1)
main_view.add_subview(ui.Button(title='location', frame=(0, 30, 75, 75),
                                tint_color='black', action=getLocation))
main_view.present()

Can Swift Playgrounds do it?!?

Not me... CPython, Pypy, Jython, IPython, Anaconda all run fine on Mac OS X... If you are not using homebrew to install on the Mac it might be difficult but with homebrew, there is no fiddling with config files. Just brew install python python3 pypy pypy3 jython ipython ; brew cask install anaconda. Also there are tons of editors and IDEs that have great Python support: brew cask install atom pycharm-ce sublime-text visual-studio-code... It would be difficult to compete against all of that.

https://forum.omz-software.com/topic/92/pythonista-for-osx

Thanks @dgelessus Your view.on_screen checking idea worked well at https://github.com/cclauss/f1_hack/blob/master/discover_view.py#L24. This is a ui for walking the hierarchy of any json data. It would still be much easier if views displayed in ui.NavigationViews received a will_close() or go_back() callback when the user presses <.

Ideas...

import scene

# for recording x and y...
points = []

class MyScene(scene.Scene):
    def __init__(self, in_dot_color=scene.Color(0, 0, 0, 1)):
        super().__init__()
        self.dot_color = in_dot_color
        self.touch = None
        
    def draw(self):
        scene.background(0, 0, 0)
        if self.touch:
            scene.fill('red')
            loc = self.touch.location
            scene.ellipse(loc.x - 50, loc.y - 50, 100, 100)
            scene.text('{}, {}'.format(*loc), 'Futura', 20, 100, 50)
            points.append(loc)  # is it be useful to check if loc == prev_loc?
        elif points:
            scene.fill('blue')
            for loc in points:
                scene.ellipse(loc.x - 50, loc.y - 50, 100, 100)
            
    def touch_began(self, touch):
        points.clear()
        self.touch = touch
        
    def touch_moved(self, touch):
        self.touch = touch
        
    def touch_ended(self, touch):
        self.touch = None

        
scene.run(MyScene(), show_fps=True)

https://github.com/cclauss/Pythonista-and-Working-Copy for now but see https://forum.omz-software.com/topic/4134/appstore-rule-change on the potential for future improvements.