Python's "private name mangling" uncoolness

This:

def __h0la():
    print("H0la")

class Foo:
    def blah(self):
        __h0la()

f = Foo()
f.blah()

throws:

joe@lark:~/sandbox/python$ python pvt.py 
Traceback (most recent call last):
  File "pvt.py", line 10, in 
    f.blah()
  File "pvt.py", line 7, in blah
    __h0la()
NameError: global name '_Foo__h0la' is not defined

And this explains the behaviour:

Private name mangling: When an identifier that textually occurs in a class definition begins with two or more underscore characters and does not end in two or more underscores, it is considered a private name of that class. Private names are..

The word "TEXTUALLY", is important here. Basically if there is an "__X" occurring within a class definition, immaterial of it referring to something else out side the class, it is 'name mangled'.

I dont know about you, but my stomach does not feel THAT good. :-/