#
#   list shallow copy
#
list_a = [10, 20, 'a', 9]

print("""
list_b = list_a[:]
#   Will also work: list_b = list(list_a) 
#   list_b = list_a.copy() 
""")

list_b = list_a[:]

print(f"list_a: {list_a}")
print(f"list_b: {list_b}")
print(f"list_a[0]: {list_a[0]}")
print(f"list_a[3]: {list_a[3]}")

print("""
list_a[0] = 44
list_a[3] = 88
""")
list_a[0] = 44
list_a[3] = 88

print(f"list_a: {list_a}")
print(f"list_b: {list_b}")
print(f"list_a[0]: {list_a[0]}")
print(f"list_a[3]: {list_a[3]}")
print(f"list_b[0]: {list_b[0]}")
print(f"list_b[3]: {list_b[3]}")

print("list_b[1] = 66")
list_b[1] = 66
print(f"list_a: {list_a}")
print(f"list_b: {list_b}")
print(f"list_a[1]: {list_a[1]}")
print(f"list_b[1]: {list_b[1]}")

#   shallow copy.
#   If an item is a list itself, it copies a reference.

print("""
list_a = [10, [20,30], 'a', ['k',9]]
list_b = list_a[:]
""")
list_a = [10, [20,30], 'a', ['k',9]]
list_b = list_a[:]

print(f"list_a: {list_a}")
print(f"list_b: {list_b}")
print(f"list_a[0]: {list_a[0]}")
print(f"list_a[1][1]: {list_a[1][1]}")
print(f"list_a[3][0]: {list_a[3][0]}")

print("""
list_a[0] = 22
list_a[1][1] = 77
""")
list_a[0] = 22
list_a[1][1] = 77

print(f"list_a: {list_a}")
print(f"list_b: {list_b}")
print(f"list_a[0]: {list_a[0]}")
print(f"list_a[1][1]: {list_a[1][1]}")
print(f"list_b[0]: {list_b[0]}")
print(f"list_b[1][1]: {list_b[1][1]}")

print("list_b[3][0] = 'hello'")
list_b[3][0] = 'hello'
print(f"list_a: {list_a}")
print(f"list_b: {list_b}")
print(f"list_b[3][0]: {list_b[3][0]}")
print(f"list_a[3][0]: {list_a[3][0]}")