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## Commands
Widgets in guizero can be given a `command` when created, which can be used to call a function when the widget is used.
By using commands you can make your GUI change and take actions when the user interacts with it, for example by clicking a button, selecting an option or typing a message.
### Example
This code will display `hello world` when the button is pressed:
```python
from guizero import App, Text, PushButton
def say_hello():
text.value = "hello world"
app = App()
text = Text(app)
button = PushButton(app, command=say_hello)
app.display()
```
Arguments can be passed to the command function using the `args` parameter.
```python
from guizero import App, Text, PushButton
def say_goodbye(first_name, last_name):
text.value = first_name + " " + last_name
app = App()
text = Text(app)
button = PushButton(app, command=say_goodbye, args=['John', 'Doe'])
app.display()
```
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