In this program, you will learn to add two numbers and display it using print() function.

To understand this example, you should have the knowledge of the following Python programming topics:

In the program below, we've used the arithmetic addition operator `+`

to add two numbers.

```
# This program adds two numbers
num1 = 1.5
num2 = 6.3
# Add two numbers
sum = float(num1) + float(num2)
# Display the sum
print('The sum of {0} and {1} is {2}'.format(num1, num2, sum))
```

**Output**

The sum of 1.5 and 6.3 is 7.8

Changing this operator, we can subtract **(-)**, multiply **(*)**, divide **(/)**, floor divide **(//)** or find the remainder (%) of two numbers.

```
# Store input numbers
num1 = input('Enter first number: ')
num2 = input('Enter second number: ')
# Add two numbers
sum = float(num1) + float(num2)
# Display the sum
print('The sum of {0} and {1} is {2}'.format(num1, num2, sum))
```

**Output**

Enter first number: 1.5 Enter second number: 6.3 The sum of 1.5 and 6.3 is 7.8

In this program, we asked the user to enter two numbers and this program displays the sum of two numbers entered by user.

We use the built-in function `input()`

to take the input. `input()`

returns a string, so we convert it into number using the `float()`

function.

Alternative to this, we can perform this addition in a single statement without using any variables as follows.

```
print('The sum is %.1f' %(float(input('Enter first number: ')) + float(input('Enter second number: '))))
```

Although this program uses no variable (memory efficient), it is not quite readable. Some people will have difficulty understanding it. It is better to write clear codes. So, there is always a compromise between clarity and efficiency. We need to strike a balance.