'''lecture_18_copying_sublists.py
Explore issues involved in copying sublists
Oliver W. Layton
CS 151: Computational Thinking: Visual Media
Fall 2020
'''


# 1) Explore copying middle row then changing an item in the copy
digits = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
# middleRow = digits[1]
# print(middleRow)
# middleRow[0] = -999
# print(middleRow)
# print(digits)

# 2) Explore copying 1st two rows then modifying the copy
digits = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
# firstTwo = digits[:2]
# print(firstTwo)
# firstTwo[0][0] = -999
# firstTwo[1][1] = 999
# print(firstTwo)
# print(digits)

# 3) Access single int, then change it
# digits = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
# theFour = digits[1][0]
# print(theFour)
# theFour = -999
# print(theFour)
# print(digits)

# How to assign/update values of an item in a list of lists
# digits = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
# digits[1][0] = -9999
# print(digits)

# 4) Access a list of basic types, but not one of the original sublists
# e.g. the 1st two ints in the first sublist
digits = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
slice = digits[1][:]
print(slice)
slice[0] = -999
print(slice)
print(digits)

# side note
# listA = [1, 2, 3]
# listB = listA[:]
# listB[0] = -999
# print(listA)
# print(listB)

# 5) Access a list with a sublist of 3 turtle objects and another with 1 turtle object.
# Slice the 1st two ints in the first sublist
import turtle
turtles = [[turtle.Turtle(), turtle.Turtle(), turtle.Turtle()], [turtle.Turtle()]]
turtSlice = turtles[0][:2]
print(turtles)
print(turtSlice)