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String

Creating

Creating

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a = 'Rudra1'
print(a)

b = "Rudra2"
print(b)

c = '''Rudra3'''
print(c)
Output
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Rudra1
Rudra2
Rudra3

Accessing Substrings

Accessing

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# Positive Indexing
# in python counting start from the 0

a = 'Hello World' 
print(a[0])
Output
1
H 


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# Negative Indexing
a = 'Hello World'
print(a[-1])
Output
1
d


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#Slicing

a = 'Hello World'
print(a[0:6])
Output
1
Hello


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# if you are use -ve indexing then the first number is > second number
    # 6 > 0

a = 'Hello World'
print(a[6:0:-2])
Output
1
Wol


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# Reverse the Line

print(a[::-1])
Output
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dlroW olleH

Editing & Deleting

Editing

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# python strings are immutable

a = 'Hello World'
a[0] = 'k'
Output
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1 # python strings are immutable
      3 a = 'Hello World'
----> 4 a[0] = 'k'

TypeError: 'str' object does not support item assignment

Deleting

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# deleting
s = 'Hello world'
del s
s
Output
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2 s = 'Hello world'
      3 del s
----> 4 print(s)
      5 s

NameError: name 's' is not defined


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g = 'Hello'
del g[1:3]
Output
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1 g = 'Hello'
----> 2 del g[1:3]

TypeError: 'str' object does not support item deletion

Operations

Operations

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print('Hello'+' '+'world')
Output
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Hello World


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print('Love_you_' * 5) # five times string
Output
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Love_you_Love_you_Love_you_Love_you_Love_you_


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# we compare the word in lexicographically 

'Delhi' != 'Odisha' # False
'Delhi' > 'Odisha' # False
'Delhi' and 'Odisha' # 'Odisha'
'Delhi' or 'Odisha' # 'Delhi'
'' and 'Odisha' # false and true -> false
'' or 'Odisha' # Odisha
not '' # empty is false --> True
not 'Rudra' # value is True --> False
Output
1

Functions

len 

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len('Rudra Prasad Bhuyan')
Output
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19

min 

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min('Rudra Prasad Bhuyan')
Output
1
' '

max 

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max('Rudra Prasad Bhuyan')
Output
1
y

sorted 

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sorted('Rudra Prasad Bhuyan', reverse=True)
Output
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['y',
'u',
'u',
's',
'r',
'r',
'n',
'h',
'd',
'd',
'a',
'a',
'a',
'a',
'R',
'P',
'B',
' ',
' ']

capitalize 

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a = 'Rudra prsad bhuyan'
a.capitalize()
Output
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'Rudra prsad bhuyan'

title 

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a.title() # only first letter of the word is capital letter
Output
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'Rudra Prsad Bhuyan'

upper 

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a.upper()
Output
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'RUDRA PRSAD BHUYAN'

swapcase 

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'Rudra Prasad Bhuyan'.swapcase()
Output
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'rUDRA pRASAD bHUYAN'

lower 

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'Rudra Prasad Bhuyan'.lower()
Output
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'rudra prasad bhuyan'

count 

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'My name is Rudra Prasad Bhuyan'.count('a')
Output
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5

index 

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'My name is Rudra Prasad Bhuyan'.index('Rudra') 
'My name is Rudra Prasad Bhuyan'.index('z')  # ValueError: substring not found

# showing error if hte string iss not present
Output
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11

endswith 

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'My name is Rudra Prasad Bhuyan'.endswith('z')
Output
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False

startswith 

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'My name is Rudra Prasad Bhuyan'.startswith('My')
Output
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True

format 

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name = 'Rudra'
age = 20
'My name is {} and my age is {}'.format(name, age)
Output
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'My name is Rudra and my age is 20'

isalnum 

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'Rudra_1234'.isalnum()
Output
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False

isalnum 

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'Rudra_1234$%'.isalnum()
Output
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False

title 

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'RUDRA'.isalpha()
Output
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True

isdigit 

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'1234'.isdigit()
Output
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True

isidentifier 

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'Rudra'.isidentifier()
Output
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True

split 

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'My name is Rudra Prasad Bhuyan'.split(sep=None)
Output
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['My', 'name', 'is', 'Rudra', 'Prasad', 'Bhuyan']


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'My name is Rudra Prasad Bhuyan'.split('a')
Output
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['My n', 'me is Rudr', ' Pr', 's', 'd Bhuy', 'n']

join 

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' '.join(['My', 'name', 'is', 'Rudra', 'Prasad', 'Bhuyan'])
Output
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'My name is Rudra Prasad Bhuyan'


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' ---'.join(['My', 'name', 'is', 'Rudra', 'Prasad', 'Bhuyan'])
Output
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'My ---name ---is ---Rudra ---Prasad ---Bhuyan'


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'My name is Rudra Bhuyan'.replace('Rudra', 'Nitesh')
Output
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'My name is Nitesh Bhuyan'