<qiyuangong>404_Sum_of_Left_Leaves_1.py
def sumOfLeftLeaves( root):
    stack = [root]
    res = 0
    while len(stack) > 0:
        curr = stack.pop(0)
        if curr is not None:
            if curr.left is not None:
                if curr.left.left is None and curr.left.right is None:
                    res += curr.left.val
            stack.insert(0, curr.right)
            stack.insert(0, curr.left)
    return res
def sample_funcname ( var_0 ) :
    var_1 = [ var_0 ]
    var_3 = 0
    while len ( var_1 ) > 0 :
        var_6 = var_1.pop ( 0 )
        if var_6 is not None :
            if var_6.left is not None :
                if var_6.left.left is None and var_6.left.right is None :
                    var_3 += var_6.left.val
            var_1.insert ( 0 , var_6.right )
            var_1.insert ( 0 , var_6.left )
    return var_3
