String data type in Python

 

Here's a comprehensive explanation of the string data type in Python:

What are strings?

• Sequences of characters used to represent textual data.

• Enclosed within single quotes (''), double quotes (""), or triple quotes (''' or """).

• Used for names, messages, descriptions, code comments, etc.

Key characteristics:

• Immutable: Cannot be modified in place. You create new strings with changes.

• Ordered: Characters have a specific order, accessible by index (starting from 0).

• Iterable: Can be looped through using for loops.

z = 20

print (z + "Rupees")

z = 10 print (str(z) + " rupees")

'vlr Training'

"vlr Training"

name = "vlr Training"

name

print(name)

Common operations:

• Concatenation: Joining strings:
  Python
  first_name = "Alice"
  last_name = "Smith"
  full_name = first_name + " " + last_name  # Output: Alice Smith
  
  

• Slicing: Extracting substrings:
  Python
  greeting = "Hello, world!"
  first_five = greeting[0:5]  # Output: Hello
  
  

• Indexing: Accessing individual characters:
  Python
  message = "Python is awesome!"
  first_letter = message[0]  # Output: P
  
  

• Formatting: Inserting variables into strings:
  Python
  name = "Bard"
  age = 30
  introduction = f"Hello, my name is {name} and I'm {age} years old."
  
  

• Finding: Searching for substrings:
  Python
  text = "This is a sample text."
  is_found = "sample" in text  # True
  
  

• Replacing: Substituting parts of a string:
  Python
  sentence = "I love coding in Python."
  new_sentence = sentence.replace("Python", "Java")  # I love coding in Java.
  
  

• Splitting: Dividing a string into a list of substrings:
  Python
  words = "apple, banana, cherry".split(",")  # Output: ["apple", "banana", "cherry"]
  
  

• Upper/lower: Converting case:
  Python
  title = "the lord of the rings".title()  # Output: The Lord Of The Rings
  
  

• Checking: Determining string properties:
  Python
  is_empty = "".isspace()  # True
  starts_with_python = "Python is cool".startswith("Python")  # True
  
  

Additional notes:

• Python has extensive string methods for various manipulations and transformations.

• Use string formatting techniques (f-strings, format() method, etc.) for flexible output.

• Consider using string libraries like string for advanced operations.

In [1]:

a=20
b=30
c=a+b

In [2]:

c

Out[2]:

50

In [3]:

print(c)

50

In [4]:

name='venkat'

In [5]:

name

Out[5]:

'venkat'

In [6]:

name="venkat"

In [7]:

name

Out[7]:

'venkat'

In [8]:

print(name)

venkat

In [9]:

cost =30

In [10]:

print( cost + 'in Rupees')

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[10], line 1
----> 1 print( cost + 'in Rupees')

TypeError: unsupported operand type(s) for +: 'int' and 'str'

In [11]:

cost=30
value="in RS"
print(cost + value)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[11], line 3
      1 cost=30
      2 value="in RS"
----> 3 print(cost + value)

TypeError: unsupported operand type(s) for +: 'int' and 'str'

In [14]:

print(str(cost)+' '+value)

30 in RS

In [15]:

name= 'ram's'

  Cell In[15], line 1
    name= 'ram's'
                ^
SyntaxError: unterminated string literal (detected at line 1)

In [16]:

name= "ram's"

In [17]:

name

Out[17]:

"ram's"

In [18]:

print(name)

ram's

In [19]:

name= 'Vlr training'
print(name[0])

V

In [20]:

print(name[3])

In [21]:

print(name[13])

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
Cell In[21], line 1
----> 1 print(name[13])

IndexError: string index out of range

In [24]:

sonname='venkat'
FathName='Seshu'
print(sonname + FathName)

venkatSeshu

In [25]:

print(sonname +"  "+FathName)

venkat  Seshu

In [26]:

print(sonname +" Father Name is "+FathName)

venkat Father Name is Seshu

In [28]:

print("ram\"s")

ram"s

In [29]:

print('ram\'s')

ram's

In [ ]: