how to format string in python3 code example

Example 1: python string format

string_a = "Hello"
string_b = "Cena"

# Index based:
print("{0}, John {1}"
      .format(string_a, string_b))
# Object based:
print("{greeting}, John {last_name}"
      .format(greeting=string_a, last_name=string_b))

Example 2: python string format

print("My name is {0} and I am {1} years old".format(name, age))

Example 3: python format strings

name = "Rick"
age = 42
print(f"My name is {name} and I am {age} years old")