The counter function counts down from start to stop when start is bigger than stop, and counts up from start to stop otherwise. Fill in the blanks to make this work correctly.

AllLoops5.py

def counter(start, stop):
	x = start
	if start > stop:
		return_string = "Counting down: "
		while x >= stop:
			return_string += str(x) 
			if x > stop:
				return_string += ","
			x -= 1
	else:
		return_string = "Counting up: "
		while x <= stop:
			return_string += str(x) 
			if x < stop:
				return_string += ","
			x += 1
	return return_string

print(counter(1, 10)) # Should be "Counting up: 1,2,3,4,5,6,7,8,9,10"
print(counter(2, 1)) # Should be "Counting down: 2,1"
print(counter(5, 5)) # Should be "Counting up: 5"

def counter(start, stop):
x = start
if start > stop:
return_string = "Counting down: "
while x >= stop:
return_string += str(x)
if start != stop:
return_string += ","
x -= 1
else:
return_string = "Counting up: "
while x <= stop:
return_string += str(x)
if x != stop:
return_string += ","
x += 1
return return_string

print(counter(1, 10)) # Should be "Counting up: 1,2,3,4,5,6,7,8,9,10"
print(counter(2, 1)) # Should be "Counting down: 2,1"
print(counter(5, 5)) # Should be "Counting up: 5"

def counter(start, stop):
output = ""
if start > stop:
output += "Counting down: "
for i in range(start, stop-1, -1):
output += str(i) + ", "
else:
output += "Counting up: "
for i in range(start, stop+1):
output += str(i) + ", "
return output.rstrip(", ") # remove any trailing comma and space

print(counter(1, 10)) # Output: Counting up: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
print(counter(2, 1)) # Output: Counting down: 2, 1
print(counter(5, 5)) # Output: Counting up: 5