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//To determine the length of a string//

len('hello world')



In [2]:

    
s= 'hello world'



In [3]:

    
Print s









    



  File "<ipython-input-3-6c3fd701e94a>", line 1
    Print s
          ^
SyntaxError: invalid syntax



In [4]:

    
print s









    



  File "<ipython-input-4-ff1a9e6c21c5>", line 1
    print s
          ^
SyntaxError: Missing parentheses in call to 'print'



In [5]:

    
print (s)









    



hello world



In [6]:

    
s









    Out[6]:





'hello world'



In [7]:

    
//Indexing //

s[2]









    Out[7]:





'l'

Slicing



In [8]:

    
S[2:]









    



---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-8-b83bb2c35ff1> in <module>()
----> 1 S[2:]

NameError: name 'S' is not defined



In [9]:

    
s[2:]









    Out[9]:





'llo world'

Grab everything upto the third index



In [10]:

    
s[:3]









    Out[10]:





'hel'

Grab everything



In [11]:

    
s[:]









    Out[11]:





'hello world'

Reverse a string



In [12]:

    
s[::-1]









    Out[12]:





'dlrow olleh'

String properties

Immutability-Once a string is created ,the elements within it cannot be changed or replaced.



In [13]:

    
print s









    



  File "<ipython-input-13-ff1a9e6c21c5>", line 1
    print s
          ^
SyntaxError: Missing parentheses in call to 'print'



In [14]:

    
print (s)









    



hello world



In [15]:

    
s[0] = 'x'









    



---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-15-d69c2f6344ea> in <module>()
----> 1 s[0] = 'x'

TypeError: 'str' object does not support item assignment

Concatenate strings



In [16]:

    
s + 'This is me'









    Out[16]:





'hello worldThis is me'



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s









    Out[17]:





'hello world'



In [18]:

    
s + ' This is me!'









    Out[18]:





'hello world This is me!'



In [19]:

    
print (s)









    



hello world



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s= s + ' This is me!'



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print(s)









    



hello world This is me!

Methods on strings



In [22]:

    
s= 'Hello'



In [23]:

    
s.upper









    Out[23]:





<function str.upper>



In [24]:

    
s.upper()









    Out[24]:





'HELLO'



In [25]:

    
s.lower()









    Out[25]:





'hello'



In [26]:

    
s.capitalize()









    Out[26]:





'Hello'



In [27]:

    
s.casefold()









    Out[27]:





'hello'



In [28]:

    
s.center()









    



---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-28-c7faacfc3b77> in <module>()
----> 1 s.center()

TypeError: center() takes at least 1 argument (0 given)



In [29]:

    
s.center(1)









    Out[29]:





'Hello'



In [30]:

    
s









    Out[30]:





'Hello'



In [31]:

    
print '%s' %(s)









    



  File "<ipython-input-31-3b3f9a439858>", line 1
    print '%s' %(s)
             ^
SyntaxError: invalid syntax



In [34]:

    
x= 'Hello'









    



  File "<ipython-input-34-cef81a1e2987>", line 3
    print 'Place : %s' %(x)
                     ^
SyntaxError: invalid syntax



In [35]:

    
print 'Place my varaible here : %s' %(x)









    



  File "<ipython-input-35-505e5b67b792>", line 1
    print 'Place : %s' %(x)
                     ^
SyntaxError: invalid syntax



In [37]:

    
print ('Place my varaible here : %s' %(x))









    



---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-37-f10f006486e7> in <module>()
----> 1 print ('Place my varaible here : %s' %(x))

NameError: name 'x' is not defined



In [38]:

    
x='Hello'
print ('Place my varaible here : %s' %(x))









    



Place my varaible here : Hello



In [39]:

    
x='hello'
print ('%s' %(x))









    



hello



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