Remembering previous and Range

prev.py

# given a list, remove successive duplicate elements

def remove_succ_lst(lst):
    result = [lst[0]]
    prev = lst[0]
    for curr in lst:
        if ( prev != curr ):
           result = result + [curr]
           prev = curr
        
    return result

print(remove_succ_lst([1, 1])) # [1]
print(remove_succ_lst([1, 1, 1, 2, 2, 3, 4, 5])) # [1, 2, 3, 4, 5]
# print(remove_succ_str("helloooooo")) # "helo"
# print(remove_succ_str("heolloooooo")) # "heolo"

def show_prev(str):
    prev = str[0]
    for curr in str:
        print("prev: " + prev + "/ curr: " + curr)
        prev = curr


show_prev("this is a sample string")


# sum of all numbers from 0 to 9

def sum_range():
    result = 0
    for el in range(3, (3 * 5) + 1, 3):
        result = result + el
    return result


print(sum_range())