String Data Types In Details

String Data Types In Details

In Python, a string is a sequence of characters that can be manipulated using various functions and methods.

Some of the main ways to manipulate strings are

  • Slicing: Extracting a substring from a larger string by specifying a range of indices. Basic syntax is : str[start:end:step]

      string = "Hello"
      string[1:4]  # "ell"
      #starting from position 1 to 
      string[:4]   # "Hell"
      string[2:]   # "llo" 
      string[:]    # "Hello"
      '''You can use negative indices to slice from the end, and specify 
      a step to slice with a stride'''
      string = "Hello"
      string[-4:-1] # "ell"
      string[::-1]  # "olleH"
      string[::2]   # "Hlo"
  • String methods: Useful functions to manipulate strings(lower(),upper(), split(), join(), replace(), find() )

      string = 'Learn Python'
      string.lower()  # returns 'learn python'
      string.upper()  # returns 'LEARN PYTHON'
      #string to list
      string = 'Learn Python Programming'
      print(string.split(' ')) # output =  ['Learn', 'Python', 'Programming']
      #list to string
      parts = ['Learn', 'Python', 'Programming']
      string.join(parts) # output = 'Learn Python Programming'
      string = 'Learn Python Programming'
      string.replace('Python', 'Java') # output = 'Learn Java Programming'
      string = 'Bitsnotion'.find('s')
      print(abc)# output = 3
  • String formatting: Integrate variables into strings.

    Python offers various methods for string formatting:

    • The f-strings (available in Python 3.6+)

    • The str.format() method

    • The % operator (deprecated in Python 3)

    name = "Nirmal"
    age = 23

    print(f"Hello, my name is {name} and I'm {age} years old.")
    print("Hello, my name is {} and I'm {} years old.".format(name, age))

    # BOth output =  "Hello, my name is Nirmal and I'm 23 years old."
  • String concatenation: Combine multiple strings using the + operator or .join() method.

      string1 = "Hello"  
      string2 = "World!"
      #method -1
      print(string1 + string2) ## output = Hello World!
      string1 += string2
      print(string1)  # output = Hello World!
      print("".join([string1, string2])) # HelloWorld!