Python nonlocal variables can't be used

Hi,
Is there any reason why nonlocal variables don't seem to work in the online submissions for Python. I tried using nonlocal statement and it gave error. The exact same code works fine in my own python environment.
image

# PYTHON
class Solution(object):
    def strongPasswordChecker(self, s):
        """
        :type s: str
        :rtype: int
        """
		
        count = 0
		
        def do_count():
            nonlocal count
            count += 1
        do_count()
        return count
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