6.py

 # string interpolation => formatting strings



userName = "sara"


userFamily = "moradi"

number_1 = 3
number_2 = 5

result = "user name is " + userName + " and user family is " + userFamily 

print(result)

#result2 = f"user name is {userName} and user family is {userFamily}"
#result3 = "user name is {userName} and user family is {userFamily}"
# print(result3)

print(f"sum is : {number_1 + number_2}")


# string indexes



print(userName[3])