new python string formatting

# Newer f-string format
name = "Foo"
age = 12
print(f"Hello, My name is {name} and I'm {age} years old.")
# output :
# Hello, my name is Foo and I'm 12 years old.

    txt1 = "My 
    name is {fname}, I'am {age}".format(fname = "John", age = 36)
txt2 = "My 
    name is {0}, I'am {1}".format("John",36)
txt3 = "My 
    name is {}, I'am {}".format("John",36) 

>>> f'Hello, {name}!'
'Hello, Bob!'

print("Sammy ate {0:f} percent of a {1}!".format(75, "pizza"))