How to correct calculation error on Python

Question

The following equations estimate the calories burned when exercising (source):

Men: Calories = [(Age x 0.2017) — (Weight x 0.09036) + (Heart Rate x 0.6309) — 55.0969] x Time / 4.184

Women: Calories = [(Age x 0.074) — (Weight x 0.05741) + (Heart Rate x 0.4472) — 20.4022] x Time / 4.184

Write a program using inputs age (years), weight (pounds), heart rate (beats per minute), and time (minutes). Output calories burned for men and women.

Ex: If the input is:

49
155
148
60

Then the output is:

Men: 489.7772466539196 calories
Women: 580.939531548757 calories

My code -

age_years = float(input('Enter your age in years:\n'))
weight_lbs = float(input('Enter your weight in pounds:\n'))
heart_rate = float(input('Enter your heart rate in beats per minute:\n'))
time_min = float(input('Enter total time in minutes:\n'))
men_calories = [(age_years * 0.2017) - (weight_lbs * 0.09036) + (heart_rate * 0.6309) - 55.0969] * (time_min / 4.184)
women_calories = [(age_years * 0.074) - (weight_lbs * 0.05741) + (heart_rate * 0.4472) - 20.4022] * (time_min / 4.184)
print("Men:" , men_calories)

Error: Traceback (most recent call last):
  File "main.py", line 8, in <module>
    men_calories = [(age_years * 0.2017) - (weight_lbs * 0.09036) + (heart_rate * 0.6309) - 55.0969] * (time_min / 4.184)
TypeError: can't multiply sequence by non-int of type 'float'

What am I doing wrong here?

Answer 1

In Python, [] are used to define lists (sometimes called arrays in other languages), not as separators for expressions such as (), so, just use parentheses instead:

...
men_calories = ((age_years * 0.2017) - (weight_lbs * 0.09036) + (heart_rate * 0.6309) - 55.0969) * (time_min / 4.184)
women_calories = ((age_years * 0.074) - (weight_lbs * 0.05741) + (heart_rate * 0.4472) - 20.4022) * (time_min / 4.184)
...

Answer 2

If you use the following expression it will round your answer up to the nearest ten thousandth. print('Women: {:.2f} calories_women') print('Men: {:.2f} calories_men') Hope that helps the next student out because the struggle is definitely REAL ???????

Answer 3

age_years = int(input())
weight_lbs = int(input())
heart_rate = int(input())
time_min = int(input())

men_calories = ((age_years * 0.2017) + (weight_lbs * 0.09036) + 
(heart_rate * 0.6309) - 55.0969) * time_min / 4.184
women_calories = ((age_years * 0.074) - (weight_lbs * 0.05741) + 
(heart_rate * 0.4472) - 20.4022) * time_min / 4.184
print('Women: {:.2f} calories'.format(women_calories))
print('Men: {:.2f} calories'.format(men_calories))

Answer 4

I actually made this lab harder that what it was. Here is what you need: Calories = ((Age x 0.2757) + (Weight x 0.03295) + (Heart Rate x 1.0781) — 75.4991) x Time / 8.368

Age=float(input())
Weight=float(input())
Heart_Rate=float(input())
Time=float(input())

Calories = float((Age * 0.2757) + (Weight * 0.03295) + (Heart_Rate * 1.0781) - 75.4991) * Time / 8.368

print('Calories: {:.2f} calories'.format(Calories))