Is every value in the array an array?

This should only test the second array dimension of the array. The values of the nested arrays don't have to be arrays. 

Examples:

```python
[[1],[2]] => true
['1','2'] => false
[{1:1},{2:2}] => false
```

Source: codewars | Difficulty: EASY
Tags: Fundamentals

Data structures

Starter code: def arr_check(arr):
	

Solutions:
def arr_check(arr):
	return all((isinstance(el, list) for el in arr))


def arr_check(arr):
	return all((isinstance(a, list) for a in arr))


def arr_check(arr):
	return all((type(ele) is list for ele in arr))


def arr_check(arr):
	return all((type(i) == list for i in arr))


def arr_check(arr):
	return all((type(e) == list for e in arr))


def arr_check(arr):
	for i in arr:
		try:
			i.append('')
		except:
			return False
	return True


def arr_check(arr):
	return sum([isinstance(x, list) for x in arr]) == len(arr)


def arr_check(arr):
	return len([el for el in arr if type(el) == list]) == len(arr)