python_topics = ["variables", "control flow", "loops", "modules", "classes"]

#Your code below: 
length = len(python_topics)
index = 0
 
while index < length:
  print("I am learning about "+ python_topics[index])
  index += 1

# output 

I am learning about variables
I am learning about control flow
I am learning about loops
I am learning about modules
I am learning about classes