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Home/ Questions/Q 9050417
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Editorial Team
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Editorial Team
Asked: June 16, 20262026-06-16T12:38:28+00:00 2026-06-16T12:38:28+00:00

Is is possible to subclass python’s built-in open? I am intermittently getting the following

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Is is possible to subclass python’s built-in open? I am intermittently getting the following error:

class Open(open):
    pass

x = mymodule.Open()

TypeError: Error when calling the metaclass bases
cannot create ‘builtin_function_or_method’ instances

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  1. Editorial Team
    Editorial Team
    2026-06-16T12:38:29+00:00Added an answer on June 16, 2026 at 12:38 pm

    The open is not a class, it is a function. However, the file object is a type that you can subclass.

    type(open)
    # OUT: <type 'builtin_function_or_method'>
    type(file)
    # OUT: <type 'type'>
    
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