In a recent CppCast interview, Herb Sutter describes how he would change C/C++ types if he could go back in time. This is almost exactly how things were changed from Python 2 to Python 3 (str split into Unicode strings and byte arrays)

My recollection is that person.image_data was not present in the original version of the contacts module but was added later. That is why it is not in the webpage docs but is in the in-the-app docs. I also think the workaround code was published before person.image_data was added to the module.

With the current module, I believe that you can do it all without ObjC.

You might also open an issue in the module’s repo to help the maintainers know about Pythonista and its unique needs. Someone in that community might have already made the combination work.

To view doc in app, switch to console the click on the ? icon at upperleft.

There is a #editorial channel in the Pythonista Slack.

Why use ObjC for person.image_data?
https://forum.omz-software.com/topic/5448/contacts-images

Do you really need ObjC to do these thing? Why not just use the contacts module?

https://datawhatnow.com/things-you-are-probably-not-using-in-python-3-but-should

"""Bariatric Math Calculations"""

try:
    raw_input
except NameError:  # Python 3
    raw_input = input

weight_lbs = int(raw_input('what is your current weight (lbs): '))
height_ft = int(raw_input('what is your current height in feet: '))
height_inches = int(raw_input('You are ' + str(height_ft) + ' feet and how many inches: '))
previous_bariatrics = 0

        

def Weight_Convert_Kg(weight_lbs):
    x = weight_lbs / 2.204
    return x
weight_kg  = int(Weight_Convert_Kg(weight_lbs))
    
def Total_Height_Inches(height_ft, height_inches):
    x = (height_ft * 12) + height_inches
    return x
total_height_inches = int(Total_Height_Inches(height_ft, height_inches))
                
def Height_Convert_Meters(total_height_inches):
    x = total_height_inches * 0.0254
    return x
height_meters = Height_Convert_Meters(total_height_inches)
height_meters = round(height_meters, 2)
    

def Calc_Bmi(weight_kg, height_meters):
    x = weight_kg / (height_meters ** 2)
    return x
BMI = int(Calc_Bmi(weight_kg, height_meters))
    
def Weight_Convert_lbs(weight_kg):
    x = weight_kg * 2.204
    return x
calc_weight_lbs = int(Weight_Convert_lbs(weight_kg))

def Ibw_man (total_height_inches):
    x = 50 + (2.3 *(total_height_inches - 60))
    return x
ideal_body_wt_man = int(Ibw_man(total_height_inches) * 2.204)

    
def Ibw_woman(total_height_inches): 
    x = 45.5 + (2.3 *(total_height_inches - 60))
    return x 
ideal_body_wt_woman = int(Ibw_woman(total_height_inches) * 2.204)

    
    
print("kg: ", weight_kg)
print("inches: ", total_height_inches)
print("meters: ", height_meters)
print("bmi: ", BMI)
print("IBWm: ", ideal_body_wt_man)
print("IBWw: ", ideal_body_wt_woman)

You might be able to streamline your code with something like:

def make_button(title, frame, background_color):
    return ui.Button(title=title,
                     frame=frame,
                     background_color=background_color,
                     font=('<System-Bold>', 20),
                     border_width=2,
                     corner_radius=5,
                     action=button_tapped)