#
#   list assignment
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]}")