Python : Interesting String & List

Here i would like to share some interesting behavior of String & List when you use python interpreter.


String:-


We all know that the fundamental thing about Python Strings is that they are "Immutable" ,once you created a string you couldn't change it. See some examples....


>>> s = 'fun with string'
>>> s
'fun with string'
>>> 

you can just add another string by using  '+'  as shown below...

>>> s + '!!!!'

'fun with string!!!!'

>>> 

Another important feature is String Slices. Just see how "slice" syntax behaves in python.

>>> s = 'fun with string'

>>> s[0]                                                 

'f'

>>> s[1:4]

'un '

>>> s[1:]

'un with string'

>>> s[:]

'fun with string'

>>> s[-1]

'g'

>>> s[-4]

'r'

>>> s[:-3]

'fun with str'

>>> s[-3:]

'ing'

>>> 

So now we have a string 's' and we can apply all the methods (i.e functions) that are related to string to 's' as shown below...

>>> s.upper()

'FUN WITH STRING'

>>> s.lower()

'fun with string'

>>> s.startswith('fun')

True

>>> s.endswith('string')

True

>>> s.replace('string','python')

'fun with python'

>>> 

But my favorite is the method called ' s.split() '. Just see what happens if i assigned s.split() function in to a variable 's' itself. If we print it you can see a list of elements.It just transformed into a list.

>>> s = s.split()

>>> s

['fun', 'with', 'string']

>>> 

List:-

So now the variable 's' will behave like  a list.Now you can apply all the methods related to list here with 's'.

>>> s.append('& list')

>>> s

['fun', 'with', 'string', '& list'] 

>>> s.insert(0,'some')

>>> s

['some', 'fun', 'with', 'string', '& list']

>>> s.index('some')

0

>>> s.index('string')

3

>>> s.sort()

>>> s

['& list', 'fun', 'some', 'string', 'with']

>>> s.pop(0)

'& list'

>>> 

See what happens if i call the function " join() ",and assigned it to same variable 's' .When you print 's' you could see the first string.Is it interesting?


>>> s = ['fun', 'with', 'string', '& list']
>>> s = ' '.join(s)
>>> s

'fun with string & list'

>>> 

Thank You....