I'm using Python 3.2.2, and the following program gives me an error
that I don't understand:
class Foo:
pass
foo = Foo()
foo.name = "Steve"
def add_goodbye_function(obj):
def goodbye():
print("goodbye " + obj.name)
obj.goodbye = goodbye
add_goodbye_function(foo)
foo.goodbye() # outputs goodbye Steve
foo.__exit__ = foo.goodbye
foo.__exit__() # outputs goodbye Steve
with foo: # fails with AttributeError: __exit__
print("doing stuff")
I am dynamically adding an attribute __exit__ to the variable foo,
which works fine when I call it directly, but it fails when I try to
use foo as the expression in the with statement. Here is the full
output:
> python3 with.coffee
goodbye Steve
goodbye Steve
Traceback (most recent call last):
File "with.coffee", line 17, in <module>
with foo: # fails with AttributeError:
AttributeError: __exit__
What am I doing wrong?
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