> For the complete documentation index, see [llms.txt](https://ga0-2.gitbook.io/seifxr10anz-content/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ga0-2.gitbook.io/seifxr10anz-content/python-cheatsheet/functions.md).

# Functions

To define a function in Python, you use the `def` keyword.

```python
def func_name():
    print('Tis but a scratch')
    print("A scratch? Your arm's off!")
    
func_name()
```

**Parameters/Arguments**

```python
def do_fart(where):
    print('I fart in your ' + where)
do_fart('general direction') # -> I fart in your general direction
```

```python
def intro(name, title, quest):
    print(f'It is {name} - {title}. My quest is {quest}.')
intro('Sir Arthur', 'King of the Britons', 'to seek the Holy Grail')
# -> It is Sir Arthur - King of the Britons. My quest is to seek the Holy Grail.
```

**Keyword Arguments**

```python
def divide(dividend, divisor):
    print(dividend / divisor)
divide(dividend=42, divisor=2) # -> 21.0
```

* Arguments are named according to their corresponding parameters.
* Order doesn't matter - Python will check the names and match them!
* Values are assigned because the keyword argument and the parameter name match.

**Fun fact**: You can provide some arguments in positional order and some with keywords.

* Positional arguments are assigned in sequential order
* Keywords have to come last

```python
def divide(dividend, divisor):
    print(dividend / divisor)
divide(42, divisor=2) # -> 21.0
```

**`return`**

```python
def lbs_to_kg(weight_lbs):
    weight_kg = weight_lbs * 0.45359237
    return weight_kg
    
print(lbs_to_kg(42)) # -> 19.05087954
```