> For the complete documentation index, see [llms.txt](https://www.pythonclassroom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.pythonclassroom.com/turtle-graphics/turtle-graphics-with-conditionals.md).

# Turtle Graphics with Conditionals

## Conditionals

An if conditional statement can be True or False.  When the if statement executes, the condition is tested and if it is true, the indented block of code is executed.  

|                              |   |
| ---------------------------- | - |
| if \<conditional statement>: |   |
| \<do something>              |   |
| else:                        |   |
| \<do something>              |   |

If you have a pattern where every other statement alternates, you can use use the values of the stepper variable to determine if the value of the variable is odd or even.

### Star

![](/files/-LbD9D7stelcB0UoK9om)

{% code title="star3.py" %}

```python
import turtle
turtle.showturtle()
turtle.shape("turtle")
turtle.pencolor('red')
for x in range(20):
        turtle.forward(100)
        if x % 2 == 0:
            turtle.left(175)
        else:
            turtle.left(225)
```

{% endcode %}

### ZigZag

![](/files/-LbD9q6l8Hl3KMdMUhoa)

{% code title="zigzag2.py" %}

```python
import turtle
turtle.showturtle()
turtle.shape("turtle")
turtle.pencolor('red')
for x in range(10):
    if x % 2 == 0:
        turtle.forward(25)
        turtle.right(45)
    else:
        turtle.forward(25)
        turtle.right(45)
```

{% endcode %}

###


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