What does {0} mean in this Python string?

Question

In the following code, {0} is been used in a string and I'm not sure about it and how it works. I can't able to find it anywhere to explaining it

import random

number = random.randint(1, 1000)

guesses = 0

print("I'm thinking of a number between 1 and 1000.")

while True:

   guess = int(input("\nWhat do you think it is? "))

   guesses += 1

    if guess > number:

        print("{0} is too high.".format(guess))

    elif guess < number: 

        print("{0} is too low.".format(guess))

    else:

        break

print("\nCongratulations, you got it in {0} guesses!\n".format(guesses))

Answer 1

It acts as an indicator in the format method that if you want it to be replaced by the first parameter(index zero) of format.

Example : 

print(42+261={0}.format(303))

Here, {0} will be replaced by 303.  

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Answer 2

{0} serves as a placeholder for string formatting in Python. It indicates where the first argument will be inserted when using the format() method. You can use multiple placeholders like {1}, {2}, and so on for additional arguments.

Example: 

employee_name = “Satvik”

employee_salary = 20000

formated_string =  “Employee Name is {0} and salary is {1}”.format(employee_name,employee_salary)

print(formated_String)

Output: 

Employee Name is Satvik and salary is 20000

In the above example, name will replace {0} and age will replace {1}. Using this procedure, dynamic strings can be created.