CodeSignal Solution hasPathWithGivenSum

hasPathWithGivenSum.py

#
# Binary trees are already defined with this interface:
# class Tree(object):
#   def __init__(self, x):
#     self.value = x
#     self.left = None
#     self.right = None
def hasPathWithGivenSum(t, s):    
    if t is None:
        if s==0:
            return True
        else:
            return False
    else:
        if t.left is not None and t.right is not None:
            return any([hasPathWithGivenSum(t.left, s-t.value), hasPathWithGivenSum(t.right, s-t.value)])
        elif t.left is not None:
            return hasPathWithGivenSum(t.left, s-t.value)
        elif t.right is not None:
            return hasPathWithGivenSum(t.right, s-t.value)
        else:
            if t.value==s:
                return True
            else:
                return False