List mutability¶

Which is the value of list a after each of these assignment statements ?

a = [['a', 1], 3, [4, 5, 'b'], [1, [2, 'c'], 9]]
a[0] = 5.7
a[-1] = 'hello'
a[1] = ['X', 1, 2.5]
a[0:2] = [0, 1]
a[2:4] = []
a[0:1] = [2, 3, 4, 5]
a[1:1] = ['x', 'y']
a[-2:] = ['a', 'b', 'c']
a[:-5] = [0, 1, 2]
a[15:20] = [5, 6]

List a has been defined as follows:

a = ['a', 'b', 'c', 'd', 'e', 'f']

write assignment statements to match the following expressions:

a == ['a', 'b', 1, 'd', 'e', 'f']
a == ['a', 'b', 'c', 'd', 2, 3]
a == ['a', 'e', 'f']
a == ['a', 'b', 'c', 'd', 4, 5, 'e', 'f']
a == [6, 'c', 'd', 'e', 'f']
a == ['a', 'b', 'c', 7]
a == ['a', 8, 9, 'f']
a == ['a', 'b', 'c', 'd', 'e', 'f', 10, 11, 12]

Which is the value of list b after the execution of each of the following assignment statements ?:

b = ['garlic', 'onion', 'parsley']
del b[0]
b[0] = 'thyme'
b[0] = ['garlic', 'onion', 'rosemary']
b[0:1] =['garlic', 'onion']
b =  b + b

We have written the two following Python functions
```
def list_test1(w):
    w = [1,1,1,1]
    w[1] = 5

def list_test2(w):
    w[1] = 5
    w = [1,1,1,1]
```
What will the value of variables k1 and k2 be after executing the following instructions ?
```
>>> k1 = [0,0,0]
>>> k2 = [0,0,0]
>>> list_test1(k1)
>>> list_test2(k2)
```
Give a reasoned answer. You can check the result using the following test file: mutab.txt
After executing these assignment statements:
```
a = ['a', 5, [], 3.2, [4, 'bc']]
b = ['a', 5, [], 3.2, [4, 'bc']]
```
have a and b the same value? Are they the same object ? You can check it by using the operators == and is, respectively.
After executing these assignment statements:
```
a = ['a', 5, [], 3.2, [4, 'bc']]
b = a
```
have a and b the same value? Are they the same object ? You can check it by using the operators == and is, respectively.
After executing these assignment statements:
```
a = ['a', 5, [], 3.2, [4, 'bc']]
b = a[:]
```
have a and b the same value? Are they the same object ? You can check it by using the operators == and is, respectively.
After executing these assignment statements:
```
a = ['a', 5, [], 3.2, [4, 'bc']]
b = a[-1]
```
have a[-1] and b the same value? Are they the same object ? You can check it by using the operators == and is, respectively.
After executing these assignment statements:
```
a = ['a', 5, [], 3.2, [4, 'bc']]
b = [4, 'bc']
```
have a[-1] and b the same value? Are they the same object ? You can check it by using the operators == and is, respectively.

Given the following list:

a = ['a', 5, [], 3.2, [4, 'bc']]

which is the result of the following print expressions ?. You can check it by using the operators == and is, respectively.

>>> b = a
>>> print(a, b)
>>> b[3] = 'x'
>>> print(a, b)
>>> a[0] = 10
>>> print(a, b)
>>> b = a[-1]
>>> b[0] = 'y'
>>> print(a, b, a[-1])

which is the result of the following print expressions ?. You can check it by using the operators == and is, respectively.
```
>>> b = [0, 1]
>>> a = ['a', b, 'c']
>>> print(a)
>>> b[0] = 2
>>> print(b)
>>> print(a)
```