Python-сообщество

            n = len(types_array)-1
			j = 0
			while j < n:
				i = 0
				while i < n-j:
					if len(types_array[i].get('key','N/A')) < len(types_array[i+1].get('key','N/A')):
						(types_array[i],types_array[i+1]) = (types_array[i+1],types_array[i])
					print '%s - %s'%(len(types_array[i].get('key','N/A')),len(types_array[i+1].get('key','N/A')))
					i+=1
				j+=1

In [9]: sorted(types_array, key=lambda x: x.get('value', None))
Out[9]: 
[{'key': 'abcde', 'value': '1'},
 {'key': 'ab', 'value': '2'},
 {'key': 'abc', 'value': '3'},
 {'key': 'abcd', 'value': '4'},
 {'key': 'a', 'value': '5'}]

In [10]: sorted(types_array, key=lambda x: x.get('key', None))
Out[10]: 
[{'key': 'a', 'value': '5'},
 {'key': 'ab', 'value': '2'},
 {'key': 'abc', 'value': '3'},
 {'key': 'abcd', 'value': '4'},
 {'key': 'abcde', 'value': '1'}]

sorted(types_array, key=lambda x: len(x.get('key', None)))

sorted(types_array, key=lambda x: len(x.get('key', ())))