Python string functions

string_name.upper() // to change all letter to upper case

string_name.lowe()  // to change all letters to lower

string_name.len()    // returns the length of string.

string_name.find("string to be founded") // if not present than return -1 else returns the index position     (0-based)

in function is a boolean variables that returns True or false.

Ex. course="python for programmers";

       print("python" in course);

output : True.           

//Note : The boolean variables are case sensitive, i.e, True is correct but true is useless, same False is correct but false is useless.

string_name.replace("string to be replaced","new string") // replaces only when string to be replaced is found.

Formatted strings -    f ' --{}---{}---'

These can be used to print stings with values of variables like;

Ex-

first= 'Ram' ;

last = 'mango' ;

msg= f ' Hello {first}, is this {last} your favourite fruit ' ;

print(msg);

output : 

Hello Ram, is this mango your favourite fruit

These { } are the place holders for variables or holes in string to store value of variables