def square(x):
    return x*x

sq = square(6)

print(sq)

36

for x in range(10):
    print(x,square(x))

0 0
1 1
2 4
3 9
4 16
5 25
6 36
7 49
8 64
9 81

def convert_hours(hours):
	if hours == 0:
		return "zero"
	if hours == 1:
		return "one"

def letter_grade(points):
    if points >= 90:
        return "A"
    elif points >= 80:
        return "B"
    elif points >= 70:
        return "C"
    elif points >= 60:
        return "D"
    else:
        return "F"

print(letter_grade(87) + " Congrats for doing well")
answer = letter_grade(87)
print(answer)

B Congrats for doing well
B

# Collections: lists/tuples, sets, dictionaries
grocery_list = ["apples","meat","green beans"]
quantity = [10,2,5]
grocery_list[2]  # index a list
len(grocery_list)

3

nums = [10,20,30,40,50,60,70,80]
nums[3:7]   # slice
nums[:7]
nums[3:]
nums[:]
nums[3:7:2]
nums[::-1]

[80, 70, 60, 50, 40, 30, 20, 10]