afternoon Oct 21
x = (4,5,6)
print x
(4, 5, 6)

type(x)
Out[4]: tuple

y = 9, 1, 8
print y
(9, 1, 8)

print x[1]
5

print y[1]
1

y[0] = 2
Traceback (most recent call last):
  File "C:\Users\Susan\AppData\Local\Enthought\Canopy\User\lib\site-packages\IPython\core\interactiveshell.py", line 2883, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-9-0829a2afab31>", line 1, in <module>
    y[0] = 2
TypeError: 'tuple' object does not support item assignment
z =([5,6],[7,8])
type(z)
Out[11]: tuple

z[0][1] = 12
print z
([5, 12], [7, 8])

print z[0]
[5, 12]
print z[0][1]
12

z[0].append(4)
print z
([5, 12, 4], [7, 8])

z[0].remove(5)
z[0].remove(12)
z[0].remove(4)
print z
([], [7, 8])
z.append(2)
Traceback (most recent call last):
  File "C:\Users\Susan\AppData\Local\Enthought\Canopy\User\lib\site-packages\IPython\core\interactiveshell.py", line 2883, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-24-d588cb91674a>", line 1, in <module>
    z.append(2)
AttributeError: 'tuple' object has no attribute 'append'