# hasattr(), getattr(), delattr()

## Check if a python Object has an Attribute

## hasattr():

### Syntax:

```python
hasattr(object, string)
```

* Object (=instance) you want to check for the attribute
* String that is the name of the attribute
* Boolean (True, False)
* The above example will lead to an error as the `brand` variable is not assigned so this has to be passed in as a string
  * `NameError: name 'brand' is not defined`
* You need to pass the brand variable to the `porsche` instance
* The above example is correct
* After that it will return `True`

### Checking methods:

* This will still return `True` as python uses methods simillar to attributes (Object)
* There is no implicit difference between a method and an attribute (Object) as:
  * A method if basically a function which is an Object

## getattr():

### Syntax:

```python
getattr(object, name[,default])
```

 Output:

```
300
```

If you print the `model` attribute then it will print the string `Wragler`

If the attribute does not exist you can return a default mode:

```python
print(getattr(Jeep, 'modelllll', '4x4'))
```

Output: `4x4`

One super helpful paramteter for this is the keyword `None`:

```python
print(getattr(Jeep, 'modelllll', None))
```

### To print out functions

* Key difference is that it has `()` at the end of the getattr function 

## delattr():

* Does not work to delete the key from a dictionary
* Basically does not work on dictionaries at all
* Used to delete the attributes
* `delattr()` is the equivalant to `del`

### Syntax:

```python
delattr(object, 'string')
```

Output will print a messy output of `__dict__` but the `hp` attribute will not be found

#### There is an additional parameter `attr.startswith("string")`

* This allows you to check if an attribute starts with something
* Useful if you want to get rid of the dunder methods within the `__dict__` print statement: 

### Which is better del or delattr()?

* `del` is faster
* `delattr()` is slower but not a huge difference