3rd Edition, Chapter 4 Nested Scope section

[gitgithan]

def f(x):
    def g():
      x = 'abc'
      print('x =', x)
    def h():
      z = x
      print('z =', z)
    x = x + 1
    print('x =', x)
    h()
    g()
    print('x =', x)
    return g

Book says If the name is found (which it is in this case), the value to which it is bound (4) is used. If it is not found there, an error message is produced.

I'm not sure if above is correct. My understanding of LEGB is python will look in the closest enclosing scope, then global. x does not have to be defined in the immediately enclosing scope of f, but any enclosing scope, searching outwards through all enclosing functions until it finds one. Failing which, it goes to global scope to find x, which will happen in this example if x is not found in scope of def f, and print the global x=3, so no error message is produced.