'''
In this exercise, we work with a function that calculates a person's 
heart rate training zones based on their age and resting heart rate. The 
function uses the Karvonen formula to calculate the target heart rate zones 
for light, moderate, and intense exercise.

The formula is:

Target_HR = Resting_HR + (Maximum_HR − Resting_HR) × Intensity

where:

Maximum_HR = 220−age

Intensities: light (50%), moderate (70%), intense (85%).


Exercise A:
Add the correct type hints and create a docstring for the function given. 

Your type hints should be the same as those given in the solution. 
For the docstring it is mostly important to see if it contains the 
same elements; the wording will usually be different per programmer.
'''

def calculate_heart_rate_zones(age, resting_hr):

    max_hr = 220 - age
    
    # Intensities for light, moderate, and intense exercises
    intensities = [0.50, 0.70, 0.85]
    
    heart_rate_zones = []
    
    for intensity in intensities:
        heart_rate_zones.append(resting_hr + (max_hr - resting_hr) * intensity)
    
    return heart_rate_zones


# Example input parameters
age_of_person = 30  # years
resting_heart_rate = 60.0  # beats per minute

# Call the function with the example inputs
heart_rate_zones = calculate_heart_rate_zones(age_of_person, resting_heart_rate)

# Print the result
print("Heart Rate Zones:", heart_rate_zones)


'''
Docstrings are not only useful as a summary when looking directly at 
source code, but also when using functions when not looking at the source code. 
We can then access docstrings using Python's `help` function.

Exercise B: 
Call the help function on the function you just created the docstring for 
and your docstring should be displayed.

Note: you can also do this with functions you have not created yourself, e.g.,
import numpy as np
help(np.linspace)
'''

help(# Your code here)