|Title:||Back to the __future__|
|Author:||Tim Peters <tim at zope.com>|
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 being made: 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 corresponding future_statement.
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])* feature: identifier name: identifier 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). + Comments. + Blank lines. + Other future_statements. Example: """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 executed. 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 def f(): x = 666 def g(): print "x is", x g() f() Under 2.0, it prints: x is 42 Nested scopes are being introduced in 2.1. But under 2.1, it still prints 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 was accepted. 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 dropped. Instances of class _Feature have two corresponding methods, .getOptionalRelease() and .getMandatoryRelease(). No feature line will ever be deleted from __future__.py. Example line: 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 script argument. 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 machine? 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 play there. 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 recognize. 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 feature's status. 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 behavior then? 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 different audience. Q: Overloading "import" sucks. Why not introduce a new statement for this? 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 compatible.
This document has been placed in the public domain.
References and Footnotes
 PEP 5, Guidelines for Language Evolution, Prescod http://www.python.org/dev/peps/pep-0005/  PEP 227, Statically Nested Scopes, Hylton http://www.python.org/dev/peps/pep-0227/  PEP 230, Warning Framework, Van Rossum http://www.python.org/dev/peps/pep-0230/  Note that this is "may" and not "will": better safe than sorry. Of course spurious warnings won't be generated when avoidable with reasonable cost.  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).