Title: Back to the __future__
Author: Tim Peters <firstname.lastname@example.org>
Type: Standards Track
From time to time, Python makes an incompatible change to the
advertised semantics of core language constructs, or changes their
accidental (implementation-dependent) behavior in some way. While this
is never done capriciously, and is always done with the aim of
improving the language over the long term, over the short term it's
contentious and disrupting.
PEP 5, Guidelines for Language Evolution suggests ways to ease
the pain, and this PEP introduces some machinery in support of that.
PEP 227, Statically Nested Scopes is the first application, and
will be used as an example here.
[Note: This is policy, and so should eventually move into PEP 5 ]
When an incompatible change to core language syntax or semantics is
1. The release C that introduces the change does not change the
syntax or semantics by default.
2. A future release R is identified in which the new syntax or semantics
will be enforced.
3. The mechanisms described in PEP 3, Warning Framework are
used to generate warnings, whenever possible, about constructs
or operations whose meaning may change in release R.
4. The new future_statement (see below) can be explicitly included in a
module M to request that the code in module M use the new syntax or
semantics in the current release C.
So old code continues to work by default, for at least one release,
although it may start to generate new warning messages. Migration to
the new syntax or semantics can proceed during that time, using the
future_statement to make modules containing it act as if the new syntax
or semantics were already being enforced.
Note that there is no need to involve the future_statement machinery
in new features unless they can break existing code; fully backward-
compatible additions can-- and should --be introduced without a
A future_statement is simply a from/import statement using the reserved
module name __future__:
future_statement: "from" "__future__" "import" feature ["as" name]
("," feature ["as" name])*
In addition, all future_statments must appear near the top of the
module. The only lines that can appear before a future_statement are:
+ The module docstring (if any).
+ Blank lines.
+ Other future_statements.
"""This is a module docstring."""
# This is a comment, preceded by a blank line and followed by
# a future_statement.
from __future__ import nested_scopes
from math import sin
from __future__ import alabaster_weenoblobs # compile-time error!
# That was an error because preceded by a non-future_statement.
A future_statement is recognized and treated specially at compile time:
changes to the semantics of core constructs are often implemented by
generating different code. It may even be the case that a new feature
introduces new incompatible syntax (such as a new reserved word), in
which case the compiler may need to parse the module differently. Such
decisions cannot be pushed off until runtime.
For any given release, the compiler knows which feature names have been
defined, and raises a compile-time error if a future_statement contains
a feature not known to it.
The direct runtime semantics are the same as for any import statement:
there is a standard module __future__.py, described later, and it will
be imported in the usual way at the time the future_statement is
The *interesting* runtime semantics depend on the specific feature(s)
"imported" by the future_statement(s) appearing in the module.
Note that there is nothing special about the statement:
import __future__ [as name]
That is not a future_statement; it's an ordinary import statement, with
no special semantics or syntax restrictions.
Consider this code, in file scope.py:
x = 42
x = 666
print "x is", x
Under 2.0, it prints:
x is 42
Nested scopes are being introduced in 2.1. But under 2.1, it still
x is 42
and also generates a warning.
In 2.2, and also in 2.1 *if* "from __future__ import nested_scopes" is
included at the top of scope.py, it prints
x is 666
Standard Module __future__.py
Lib/__future__.py is a real module, and serves three purposes:
1. To avoid confusing existing tools that analyze import statements and
expect to find the modules they're importing.
2. To ensure that future_statements run under releases prior to 2.1
at least yield runtime exceptions (the import of __future__ will
fail, because there was no module of that name prior to 2.1).
3. To document when incompatible changes were introduced, and when they
will be-- or were --made mandatory. This is a form of executable
documentation, and can be inspected programatically via importing
__future__ and examining its contents.
Each statement in __future__.py is of the form:
FeatureName = "_Feature(" OptionalRelease "," MandatoryRelease ")"
where, normally, OptionalRelease < MandatoryRelease, and both are
5-tuples of the same form as sys.version_info:
(PY_MAJOR_VERSION, # the 2 in 2.1.0a3; an int
PY_MINOR_VERSION, # the 1; an int
PY_MICRO_VERSION, # the 0; an int
PY_RELEASE_LEVEL, # "alpha", "beta", "candidate" or "final"; string
PY_RELEASE_SERIAL # the 3; an int
OptionalRelease records the first release in which
from __future__ import FeatureName
In the case of MandatoryReleases that have not yet occurred,
MandatoryRelease predicts the release in which the feature will become
part of the language.
Else MandatoryRelease records when the feature became part of the
language; in releases at or after that, modules no longer need
from __future__ import FeatureName
to use the feature in question, but may continue to use such imports.
MandatoryRelease may also be None, meaning that a planned feature got
Instances of class _Feature have two corresponding methods,
.getOptionalRelease() and .getMandatoryRelease().
No feature line will ever be deleted from __future__.py.
nested_scopes = _Feature((2, 1, 0, "beta", 1), (2, 2, 0, "final", 0))
This means that
from __future__ import nested_scopes
will work in all releases at or after 2.1b1, and that nested_scopes are
intended to be enforced starting in release 2.2.
Resolved Problem: Runtime Compilation
Several Python features can compile code during a module's runtime:
1. The exec statement.
2. The execfile() function.
3. The compile() function.
4. The eval() function.
5. The input() function.
Since a module M containing a future_statement naming feature F
explicitly requests that the current release act like a future release
with respect to F, any code compiled dynamically from text passed to
one of these from within M should probably also use the new syntax or
semantics associated with F. The 2.1 release does behave this way.
This isn't always desired, though. For example, doctest.testmod(M)
compiles examples taken from strings in M, and those examples should
use M's choices, not necessarily the doctest module's choices. In the
2.1 release, this isn't possible, and no scheme has yet been suggested
for working around this. NOTE: PEP 264 later addressed this in a
flexible way, by adding optional arguments to compile().
In any case, a future_statement appearing "near the top" (see Syntax
above) of text compiled dynamically by an exec, execfile() or compile()
applies to the code block generated, but has no further effect on the
module that executes such an exec, execfile() or compile(). This
can't be used to affect eval() or input(), however, because they only
allow expression input, and a future_statement is not an expression.
Resolved Problem: Native Interactive Shells
There are two ways to get an interactive shell:
1. By invoking Python from a command line without a script argument.
2. By invoking Python from a command line with the -i switch and with a
An interactive shell can be seen as an extreme case of runtime
compilation (see above): in effect, each statement typed at an
interactive shell prompt runs a new instance of exec, compile() or
execfile(). A future_statement typed at an interactive shell applies to
the rest of the shell session's life, as if the future_statement had
appeared at the top of a module.
Resolved Problem: Simulated Interactive Shells
Interactive shells "built by hand" (by tools such as IDLE and the Emacs
Python-mode) should behave like native interactive shells (see above).
However, the machinery used internally by native interactive shells has
not been exposed, and there isn't a clear way for tools building their
own interactive shells to achieve the desired behavior.
NOTE: PEP 264 later addressed this, by adding intelligence to the
standard codeop.py. Simulated shells that don't use the standard
library shell helpers can get a similar effect by exploiting the
new optional arguments to compile() added by PEP 264.
Questions and Answers
Q: What about a "from __past__" version, to get back *old* behavior?
A: Outside the scope of this PEP. Seems unlikely to the author,
though. Write a PEP if you want to pursue it.
Q: What about incompatibilities due to changes in the Python virtual
A: Outside the scope of this PEP, although PEP 5  suggests a grace
period there too, and the future_statement may also have a role to
Q: What about incompatibilities due to changes in Python's C API?
A: Outside the scope of this PEP.
Q: I want to wrap future_statements in try/except blocks, so I can
use different code depending on which version of Python I'm running.
Why can't I?
A: Sorry! try/except is a runtime feature; future_statements are
primarily compile-time gimmicks, and your try/except happens long
after the compiler is done. That is, by the time you do
try/except, the semantics in effect for the module are already a
done deal. Since the try/except wouldn't accomplish what it
*looks* like it should accomplish, it's simply not allowed. We
also want to keep these special statements very easy to find and to
Note that you *can* import __future__ directly, and use the
information in it, along with sys.version_info, to figure out where
the release you're running under stands in relation to a given
Q: Going back to the nested_scopes example, what if release 2.2 comes
along and I still haven't changed my code? How can I keep the 2.1
A: By continuing to use 2.1, and not moving to 2.2 until you do change
your code. The purpose of future_statement is to make life easier
for people who keep current with the latest release in a timely
fashion. We don't hate you if you don't, but your problems are
much harder to solve, and somebody with those problems will need to
write a PEP addressing them. future_statement is aimed at a
Q: Overloading "import" sucks. Why not introduce a new statement for
A: Like maybe "lambda lambda nested_scopes"? That is, unless we
introduce a new keyword, we can't introduce an entirely new
statement. But if we introduce a new keyword, that in itself
would break old code. That would be too ironic to bear. Yes,
overloading "import" does suck, but not as energetically as the
alternatives -- as is, future_statements are 100% backward
This document has been placed in the public domain.
References and Footnotes
 PEP 5, Guidelines for Language Evolution, Prescod
 PEP 227, Statically Nested Scopes, Hylton
 PEP 230, Warning Framework, Van Rossum
 Note that this is "may" and not "will": better safe than sorry. Of
course spurious warnings won't be generated when avoidable with
 This ensures that a future_statement run under a release prior to
the first one in which a given feature is known (but >= 2.1) will
raise a compile-time error rather than silently do a wrong thing.
If transported to a release prior to 2.1, a runtime error will be
raised because of the failure to import __future__ (no such module
existed in the standard distribution before the 2.1 release, and
the double underscores make it a reserved name).