Encourage More Use of `enumerate()`

For example, the following code:

```python
for i in range(len(tag)):
    _register_device(target, tag[i], _controllers[parent[i]], args[i], kwargs[i])
```

should be rewritten as:

```python
for i, t in enumerate(tag):
    _register_device(target, t, _controllers[parent[i]], args[i], kwargs[i])
```
