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
```

Difficulty: introductory

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(i) is 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)