>>> a = [1,2,3,4]
>>> a[0]
1
>>> a[1]
2
>>> a[0] = 10
>>> a
[10, 2, 3, 4]

def type_list(x):

        x[0] = 10

        print x

if __name__ == '__main__':

        a = [1,2,3,4]

        type_list(a)

        print a

[10,2,3,4]

[10,2,3,4]

tuple:

>>> a = (1,2,3,4)

>>> a[0]

1

>>> a[1]

2

>>> a[0] = 10

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

TypeError: 'tuple' object does not support item assignment

def type_tuple(x):

        x[0] = 10

        print x

if __name__ == '__main__':

        a = (1,2,3,4)

        type_tuple(a)

        print a

Traceback (most recent call last):

  File "type_tuple.py", line 7, in <module>

    type_tuple(a)

  File "type_tuple.py", line 2, in type_tuple

    x[0] = 10

TypeError: 'tuple' object does not support item assignment

>>> a = {'tom':97, 'lisa':85}

>>> a['tom']

97

>>> a['tom'] = 75

>>> a

{'lisa': 85, 'tom': 75}

def type_list(x):

        x['tom'] = 75

        print x

if __name__ == '__main__':

        a = {'tom':98, 'lisa':85}

        type_list(a)

        print a

{'lisa': 85, 'tom': 75}

{'lisa': 85, 'tom': 75}

>>> a = 'abcd'

>>> a[0]

'a'

>>> a[1]

'b'

>>> a[2]

'c'

>>> a[0] = 'b'

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

TypeError: 'str' object does not support item assignment

def type_str(x):

        x = 'bbbb'

        print x

if __name__ == '__main__':

        a = 'abcd'

        type_str(a)

        print a

bbbb
abcd

def type_number(x):

        x = 100

        print x

if __name__ == '__main__':

        a = 1

        type_number(a)

        print a

100

1