[New-bugs-announce] [issue27999] Make "global after use" a SyntaxError

[Ivan Levkivskyi]

New submission from Ivan Levkivskyi:

The documentation at https://docs.python.org/3/reference/simple_stmts.html says that:

"Names listed in a global statement must not be used in the same code block textually preceding that global statement"

But then later:

"CPython implementation detail: The current implementation does not enforce the two restrictions,
but programs should not abuse this freedom, as future implementations may enforce them..."

Code like this

def f():
    x = 1
    global x

gives SyntaxWarning for several releases, maybe it is time to make it a SyntaxError?

----------
assignee: docs at python
components: Documentation, Interpreter Core
messages: 274813
nosy: docs at python, gvanrossum, levkivskyi
priority: normal
severity: normal
status: open
title: Make "global after use" a SyntaxError
type: behavior
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27999>
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