Thinking about it, my guess is that properly scoping the variable does not really prevent the user from leaking the value anyway: with context() as foo:

Thinking about it, my guess is that properly scoping the variable does not really prevent the user from leaking the value anyway: with context() as foo: leak = foo This is unlike list comprehensions, where it is syntactically impossible to bind the comprehension variable to a new name accessible outside the comprehension. So maybe the reason is that it is not really worth the trouble.