Popup fails depending on what I BIND - kivy

Question

Here is the relevant portion of my Animal Picker in KIVY file shown below:
AniPic#ANIMALPICKER
id: aroot
labelText: ''
imageSource: ''
animalCode: 'AB'
animalName: 'GOGGA'
BoxLayout:
orientation: 'horizontal'
width: root.width
pos: 0,0
canvas.before:
RoundedRectangle:
pos: 5, 5
# the next two lines determine the position of the rectangle for the image
size: root.width-10, root.height-10
source: root.imageSource
radius:[10]
PinButton:
id: _pin
on_release:
root.pin_action(root.labelText)
Label:
id: _label
text: root.labelText
width: root.width
color: (1, 1, 1, 1)
MapButton:
id: _map
on_release:
root.map_show(root.labelText)
#==========================================================================
AnimalWindow:
:
id: animalid
name: 'animal'
canvas.before:
Color:
rgba: 1, 1, 1, 1
Rectangle:
pos: self.pos
size: self.size
BoxLayout:
orientation: 'vertical'
Label:
id: choice
text: "Sightings"
color: 0, 0, 0, 1
size_hint_y: 0.05
canvas.before:
Color:
rgba: 0.5, 1, 0.5, 1
Rectangle:
pos: self.pos
size: self.size
ScrollView:
do_scroll_x: False
do_scroll_y: True
GridLayout:
size: (root.width, root.height)
cols: 1
rows: 9
padding: 10
spacing: 10
size_hint_x: None
size_hint_y: 9
height: self.minimum_height
row_default_height: 120
row_force_default: True
AniPic:
labelText: 'LION'
imageSource: 'images/lion_pic.jpg'
animalCode: 'LI'
AniPic:
labelText: 'CHEETAH'
imageSource: 'images/cheetah_pic.png'
animalCode: 'CH'
Now when I click on a 'PinButton' of a particular animal (CHEETA) I get the app executing
def pin_it(_animal):
print('aaaa', _animal )
and shows.
'aaaa CHEETAH'
BUT the POPUP code below, where I want 'confirmation' for pin action, does not show the popup but crashes:
class ANIMALPICKER(RelativeLayout):
def pin_action(self, _animal):
# Prepare to confirm that you want to Pin the sighting
title_text = _animal + ' ' + 'SIGHTING'
content_text = 'Confirm Sighting?'
content_box = BoxLayout(orientation='vertical')
btn_box = BoxLayout(orientation='horizontal')
btn_box.height = 24
content_label = Label()
content_label.text = content_text
yes_btn = Button(text='Yes')
yes_btn.background_color = 0, 1, 0, 1
no_btn = Button(text='No')
no_btn.background_color = 1, 0, 0, 1
btn_box.add_widget(yes_btn)
btn_box.add_widget(no_btn)
content_box.add_widget(content_label)
content_box.add_widget(btn_box)
# Now confirm that you want to Pin the sighting
popup = Popup(title=title_text,
separator_height=4,
title_size='20sp',
content=content_box,
size_hint=(None, None),
size=(200, 240),
auto_dismiss=False)
# dismiss popup and proceed to pin the sighting, on release of yes button
yes_btn.bind(on_press=pin_it(_animal))
# dismiss popup on release of the NO button
yes_btn.bind(on_release=popup.dismiss)
popup.open()
with the following message:
File "/home/sib/PycharmProjects/SpotMap/animalWindow.py", line 66, in pin_action
yes_btn.bind(on_press=pin_it(_animal))
File "kivy/_event.pyx", line 444, in kivy._event.EventDispatcher.bind
AssertionError: None is not callable
However when I bind a simple 'yes_btn.bind(on_press=dismiss)' instead of 'yes_btn.bind(on_press=pin_it(_animal))' the popup does display and the the popup dismisses when the button to which it is attached is pressed.
Please at 82 years of age and a limited knowledge of Python, Kivy and OO I desperately need help in completing this app.
A work around will also satisfy me
Many Thanks

Answer 1

I think the problem is that pin_it(_animal) completes the function instead of referencing the function object.
from functools import partial
myfun = partial(pin_it, animal=_animal)
# this should be a function, not function()
yes_btn.bind(on_press=myfun)