a = int(input("Enter first number: "))
b = int(input("Enter second number: "))
op = input("Enter +, -, *, /: ")

if op == '+':
    print(a + b)
elif op == '-':
    print(a - b)
elif op == '*':
    print(a * b)
elif op == '/':
    print(a / b)

Enter first number:  6
Enter second number:  4
Enter +, -, *, /:  +


10

c = float(input("Celsius: "))
f = (c * 9/5) + 32
print("Fahrenheit:", f)

Celsius:  8


Fahrenheit: 46.4

nums = [4, 2, 9, 1]
nums.sort()
print(nums)

[1, 2, 4, 9]