 # Basic Operators

This section explains how to use basic operators in Python.
number = 1 + 2 * 3 / 4.0 print(number)

2.5

remainder = 11 % 3 print(remainder)

Using two multiplication symbols makes a power relationship.

squared = 7 ** 2
cubed = 2 ** 3
print
(squared)
print(cubed)
49
8

# Python if Statement

## The simple Python if statement

You use the `if `statement to execute a block of code based on a specified condition.

The syntax of the `if `statement is as follows:

`if condition: if-block`

The `if` statement checks the condition first.

If the condition evaluates to `True`, it executes the statements in the if-block. Otherwise, it ignores the statements.

Note that the colon (`:`) that follows the `condition` is very important. If you forget it, you’ll get a syntax error.

The following flowchart illustrates the if staetement:

` `

For example:

`age = input('Enter your age:') if int(age) >= 18: print("You're eligible to vote.")`
Code language: Python (python)

This example prompts you to input your age. If you enter a number that is greater than or equal to `18`, it’ll show a message `"You're eligible to vote"` on the screen. Otherwise, it does nothing.

The condition `int(age) >= 18` converts the input string to an integer and compares it with 18.

```Enter your age:18 You're eligible to vote.```

The following shows the syntax of the `if...else` statement:

```if condition: if-block; else: else-block;```
Code language: Python (python)

In this syntax, the `if...else` will execute the `if-block` if the condition evaluates to `True`. Otherwise, it’ll execute the `else-block`.

The following flowchart illustrates the `if..else`

The following example illustrates you how to use the  `if...else` statement:

```age = input('Enter your age:') if int(age) >= 18: print("You're eligible to vote.")  else: print("You're not eligible to vote.")``` Back Next