The following code will print a message only once:
class PrintOnce:
printOnce = True
def __init__(self):
if PrintOnce.printOnce:
print 'Printing once.'
PrintOnce.printOnce = False
first = PrintOnce()
second = PrintOnce()
The following code will do the same thing for a nested class:
class Outer:
class Inner:
printOnce = True
def __init__(self):
if Outer.Inner.printOnce:
print 'Printing once.'
Outer.Inner.printOnce = False
def __init__(self):
first = Outer.Inner()
second = Outer.Inner()
outer = Outer()
However the following code, which has a private nested class, does not
work:
class Public:
class __Private:
printOnce = True
def __init__(self):
print 'Creating a __Private instance'
if Public.__Private.printOnce:
print 'Printing once.'
Public.__Private.printOnce = False
def __init__(self):
print 'Creating a Public instance'
first = Public.__Private()
second = Public.__Private()
public = Public()
Attempting to run the code will produce this error:
AttributeError: class Public has no attribute '_Private__Private'
What can be done so that this private nested class can have the same
functionality as the public nested class?
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