from bk import break_and_show
debug = False    # set debug to False if you do not want to see breakpoints.

#  Version 1: loop five times from 0 to 4.
for i in range(5):      # range(stop): start assumes to be 0.
    if debug: break_and_show()
    print(f"square({i}): {i * i}")

#  Version 2: loop five times from 1 to 5.
for i in range(1, 6):  # range(start, stop)
    if debug: break_and_show()
    print(f"square({i}): {i * i}")

#  Version 3: loop three times: 1, 3, 5.
for i in range(1, 6, 2):  # range(start, stop, step)
    if debug: break_and_show()
    print(f"square({i}): {i * i}")

# summing a list:
list_1 = [3,4,1,7,8,3,6]
print(f"list_1: {list_1}")
print(f"len(list_1): {len(list_1)}")

list_sum = 0
for i in range(len(list_1)):
    if debug: break_and_show()
    list_sum += list_1[i]
print(f"sum of list_1: {list_sum}")
print(f"sum(list_1): {sum(list_1)}")