Python Training and Exercises : String Methods

Strings

					
>>> a = "python training and exercises"

>>> len(a)
29

>>> max(a)
'y'

>>> min(a)
' '

>>>print( a[0:6] + ' tutorial')
'python tutorial'

>>> a = 'python '

>>> b = 'tutorial'

>>> print (a + b)
python tutorial

>>> print (a * 3)
python python python 

>>> print (a * 3 + b)
python python python tutorial

>>> 't' in a
True

>>> 's' in a
False

>>> 's' not in a
True

>>> 't' not in a
False

>>> a = "interface eth0 is up"
	
>>>if 'up' in a:
...		print ("interface is up")
...else:
...		print ("interface is down")
	 
----------Output----------

interface is up

String methods: Count , Find and Index


>>> a = "python training and exercises"

>>> a.count('n')
4

>>> a.count('n', 10, 20)
3

>>> a = "interface ethernet0 up, interface ethernet1 up, interface ethernet3 down"

>>> a.count('up')
2

>>> a = "python training and exercises"

>>> a.find('n')
5

>>> a.find('n', 10, 20)
11

>>> a.rfind('q')
-1

>>> a.rfind('n')
17

>>> a.find('training')
7

'''
a.index() is like a.find(), but raises “ValueError” if the string is not found
'''

>>> a.index('n')
5

>>> a.rindex('n')
17

>>> a.index('q')
ValueError: substring not found

Split ,Join and Splitlines

	
>>> a="192.168.1.1"

>>> a.split('.')
['192', '168', '1', '1']

>>> a = "python training"

>>> a.split('n')
['pytho', ' trai', 'i', 'g']

>>> a.split('n',maxsplit=1)
['pytho', ' training']

>>> a.split('n',maxsplit=2)
['pytho', ' trai', 'ing']


>>> a = ['192', '168', '1', '2']

>>> b = '.'

>>> b.join(a)
'192.168.1.2'

>>> a = '''eth0 is up
... eth2 is down
... eth2 is up
... eth3 is up'''
	
>>> print (a)
eth0 is up
eth2 is down
eth2 is up
eth3 is up

>>> a.splitlines()
['eth0 is up', 'eth2 is down', 'eth2 is up', 'eth3 is up']

Strip, lstrip and rstrip


>>> a = "--------------------python training---------------------"

>>> a.strip('-')
'python training'

>>> a.lstrip('-')

'python training---------------------'

>>> a.rstrip('-')
'--------------------python training'


>>> a = "             python training            "

>>> print(a)
	'             python training            '

>>> a.strip()
'python training'

String Replace

	

>>> a = "python training"

>>> a.replace('n', 'N')
'pythoN traiNiNg'

>>> a.replace('n', 'N', 1)
'pythoN training'


>>> a = "Interface Eth0 is up"

>>> a.replace('up','down')
'Interface Eth0 is down'

Case conversions


>>> a = "python training and exercises"

>>> a.capitalize()
'Python training and exercises'

>>> a.title()
'Python Training And Exercises'

>>> a.upper()
'PYTHON TRAINING AND EXERCISES'

>>> b = a.upper()

>>> print(b)
'PYTHON TRAINING AND EXERCISES'
	
>>> b.lower()
'python training and exercises'