Kivy Placing a FloatLayout inside of a BoxLayout - kivy

Question

I'm trying to place a Float Layout inside a Boxlayout. When I try this the labels inside get stacked on each other. What am I doing wrong?
Thank you!
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.label import Label
def add_entry(bl):
fl = FloatLayout()
# add label left
_lbl = Label()
_lbl.id = '_lbl0'
_lbl.text = 'LEFT'
_lbl.pos_hint = {'x': 0, 'center_y': .5}
fl.add_widget(_lbl)
# add label center
_lbl1 = Label()
_lbl1.id = '_lbl1'
_lbl1.text = 'CENTER'
_lbl1.pos_hint = {'center_x': .5, 'center_y': .5}
fl.add_widget(_lbl1)
# add label right
_lbl2 = Label()
_lbl2.id = '_lbl2'
_lbl2.text = 'RIGHT'
_lbl2.pos_hint = {'right': 1, 'center_y': .5}
fl.add_widget(_lbl2)
bl.add_widget(fl)
class MyApp(App):
def build(self):
bl = BoxLayout()
bl.orientation = 'vertical'
for g in range(3):
add_entry(bl)
return bl
if __name__ == '__main__':
MyApp().run()
I think the reason is somehow the size of the FloatLayout. It seems to have size 0: this would explain, why the labels are above each other.
That's how I want it to look like: 
That's how it appears:

Answer 1

You just need to add a size_hint_x to each Label. Something like:
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.label import Label
def add_entry(bl):
fl = FloatLayout()
# add label left
_lbl = Label()
_lbl.id = '_lbl0'
_lbl.text = 'LEFT'
_lbl.size_hint_x = 0.3
_lbl.pos_hint = {'x': 0, 'center_y': .5}
fl.add_widget(_lbl)
# add label center
_lbl1 = Label()
_lbl1.id = '_lbl1'
_lbl1.text = 'CENTER'
_lbl1.size_hint_x = 0.3
_lbl1.pos_hint = {'center_x': .5, 'center_y': .5}
fl.add_widget(_lbl1)
# add label right
_lbl2 = Label()
_lbl2.id = '_lbl2'
_lbl2.text = 'RIGHT'
_lbl2.size_hint_x = 0.3
_lbl2.pos_hint = {'right': 1, 'center_y': .5}
fl.add_widget(_lbl2)
bl.add_widget(fl)
class MyApp(App):
def build(self):
bl = BoxLayout()
bl.orientation = 'vertical'
for g in range(3):
add_entry(bl)
return bl
if __name__ == '__main__':
MyApp().run()
The default size_hint is (1, 1), so each Label tries to fill the entire width of the FloatLayout. By setting size_hint_x to 0.3, each Label takes up only about a third of the width.