# Bài 4.5
# -------
# Given an integer list from -10 to 10 except 0, write a function:
# - calculate its sum without using function ``sum``.
# - calculate its product
# Return a tuple (sum, product).
# Input::
# li = range(-10, 11)
# li = list(li)
# li.remove(0)
# Compare output with this::
# from functools import reduce
# assert sum_and_product(li) == (sum(li), reduce(lambda x,y: x*y, li))
lst = list(range(-10, 11))
lst.remove(0)
sum_lst = 0
for num in lst:
sum_lst = sum_lst + int(num)
assert sum(lst) == sum_lst, 'You sum this list incorrect'
print(sum_lst)
