Python String Methods

String is an immutable sequence data type.

It is the sequence of Unicode characters wrapped inside single, double, or triple quotes.

Functions

1. capitalize()

   • Converts the first character to upper case

     txt = "hello world!"
     x = txt.capitalize()
     print(x)
     

2. casefold()

   • Converts string into lower case

     txt = "Hello, World!"
     x = txt.casefold()
     print(x)
     

3. center()

   • Returns a centered string

     txt = "mercedes"
     x = txt.center(10)
     print(x)
     

4. count()

   • Returns the number of times a specified value occurs in a string

     txt = "I love buggatti, buggatti is my favourite company."
     x = txt.count("buggatti")
     print(x)
     

5. encode()

   • Returns an encoded version of the string

     txt = "I love buggatti, buggatti is my favourite company."
     x = txt.encode()
     print(x)
     

6. endswith()

   • Returns true if the string ends with specified value

     txt = "I love buggatti, buggatti is my favourite company."
     x = txt.endswith(".")
     print(x)
     

7. expandtabs()

   • Sets the tab size of the string

     txt = "I love buggatti, buggatti is my favourite company."
     x = txt.expandtabs(3)
     print(x)
     

8. find()

   • Searches the string for a specified value and returns the position of where it was found

     txt = "I love buggatti, buggatti is my favourite company."
     x = txt.find("buggatti")
     print(x)
     

9. format()

   • Formats specified values in a string

     txt = "For only {price:.2f} dollars!"
     print(txt.format(price = 49))
     

10. join()

    • Convers the elements of an iterable into a string

    company = ("Mercedes", "Buggatti", "Pagani")
    x = "vs".join(company)
    print(x)
    

11. lower()

    • Converts string into lower case

    txt = "HELLO, WORLD!"
    x = txt.lower()
    print(x)
    

12. maketrans()

    • Returns a translation table to be used in translations

    txt = "HELLO, WORLD!"
    x = txt.maketrans("WORLD", "PEOPLE"))
    print(x)
    

13. replace()

    • Returns a string where a specified value is replaced with a specified value

    txt = "HELLO, WORLD!"
    x = txt.replace("WORLD", "PEOPLE"))
    print(x)
    

14. split()

    • Splits the string at the specified separator, and returns a list

    txt = "Welcome to my world!"
    x = txt.split()
    print(x)
    

15. splitlines()

    • Splits the string at line breaks and returns a list

    txt = "Welcome to my world!"
    x = txt.splitlines()
    print(x)
    

16. startswith()

    • Returns True if the string starts with the specified value

    txt = "Welcome to my world!"
    x = txt.startswith("Welcome")
    print(x)
    

17. strip()

    • Returns a trimmed version of the string

    txt = "    People   "
    x = txt.strip()
    print("Welcome", x)
    

18. swapcase()

    • Swap cases, lower case becomes upper case and vice versa

    txt = "Welcome to my WORLD!"
    x = txt.swapcase()
    print(x)
    

19. title()

    • Converts the first character of each word to upper case

    txt = "welcome to my world!"
    x = txt.title()
    print(x)
    

20. upper()

    • Converts a string into upper case

    txt = "Welcome to my world!"
    x = txt.upper()
    print(x)
    

String Checker

1. isalnum()

   • Returns True if all characters in the string are alphanumeric

     txt = "AstonMartin007"
     x = txt.isalnum()
     print(x)
     

2. isalpha()

   • Returns True if all characters in the string are in the alphabet

     txt = "SpaceX"
     x = txt.isalpha()
     print(x)
     

3. isascii()

   • Returns True if all characters in the string are ascii characters

     txt = "AstonMartin007"
     x = txt.isascii()
     print(x)
     

4. isdecimal()

   • Returns True if all characters in the string are decimals

     txt = "\u0033" #unicode for 3
     x = txt.isdecimal()
     print(x)
     

5. isdigit()

   • Returns True if all characters in the string are digits/numbers

     txt = "2580"
     x = txt.isdigit()
     print(x)
     

6. isidentifier()

   • Returns True if the string is an identifier

     txt = "Demo"
     x = txt.isidentifier()
     print(x)
     

7. islower()

   • Returns True if all characters in the string are lower case

     txt = "song"
     x = txt.islower()
     print(x)
     

8. isprintable()

   • Returns True if all characters in the string are printable

     txt = "2580"
     x = txt.isprintable()
     print(x)
     

9. isspace()

   • Returns True if all characters in the string are whitespaces

     txt = "  "
     x = txt.isspace()
     print(x)
     

10. istitle()

    • Returns True if the string follows the rules of a title

    txt = "This is my code"
    x = txt.istitle()
    print(x)
    

11. isupper()

    • Returns True if all characters in the string are upper case

    txt = "CODE"
    x = txt.isupper()
    print(x)