I have this list of numbers: {199, 200, 208, 210, 200, 207, 240}.

1. I want to determine how the numbers are increasing or decreasing in the list. For instance, after 199 I have 200, that is a difference of 1. But after 200, I have 208 which is a difference of 8. How do I determine this measure of increase/decrease for the entire list in Python?

2. Secondly, I want to count how many times the numbers are increasing. As the list consist of increasing and decreasing numbers both, I just want to count how many times it is increasing.

Thank you.

CodePudding user response：

You can use zip() to pair up elements with their successors and process them in list comprehensions:

numbers = [199, 200, 208, 210, 200, 207, 240]

increments = [b-a for a,b in zip(numbers,numbers[1:]) if b>a]
decrements = [b-a for a,b in zip(numbers,numbers[1:]) if a>b]

print(increments)      # [1, 8, 2, 7, 33]
print(decrements)      # [-10]
print(len(increments)) # 5

CodePudding user response：

diff = [l[i 1] - l[i] for i in range(len(l) - 1)]
num_inc = sum([l[i 1] > l[i] for i in range(len(l) - 1)])