New submission from Dwight Guth:
Consider the following program:
import io
class A(io.IOBase):
def __init__(self):
self.x = 5
def read(self, limit=-1):
self.x -= 1
if self.x > 0:
return b"5"
return b""
def seek(self, offset, whence=0):
return 0
def write(self, b):
pass
a = A()
a.close()
assert a.__next__() == b"5555"
assert a.readline() == b""
assert a.tell() == 0
These three operations succeed, even though the file is closed. However, these
two operations fail:
a.readlines()
a.writelines([])
Why do some of the mixin methods on IOBase call _checkClosed and others don't?
----------
components: IO
messages: 190224
nosy: dwight.guth
priority: normal
severity: normal
status: open
title: Inconsistent behavior of IOBase methods on closed files
type: behavior
versions: Python 3.3
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Python tracker <[email protected]>
<http://bugs.python.org/issue18082>
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