Fix method delegation in _flushfile #1
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Required when the faked stream is already faked and the original fake also uses method delegation.
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The change is required when the stream to be wrapped is already a wrapper over the original std-stream and the wrapper also uses method delegation via
__getattr__.I discovered this issue when investigating thonny/thonny#2924
Thonny IDE fakes the standard streams before running the code using cs05, which tries to add another wrapper over these faked streams. The problem is that cs50's
object.__getattribute__(self.f, name)only sees the methods defined directly in Thonny's FakeStream and does not consider the methods available via__getattr__.The built-in
getattrproposed in this PR is able to look deeper.For extra confidence you could investigate this SO answer, which also uses
getattr: https://stackoverflow.com/a/107717/261181