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updated by Jeffrey Yasskin.

Other Language Changes

Some smaller changes made to the core Python language are:

Directories and zip archives containing a

__main__.py

file can now be executed

directly by passing their name to the interpreter. The directory or zip archive is

automatically inserted as the first entry in sys.path. (Suggestion and initial patch by

Andy Chu, subsequently revised by Phillip J. Eby and Nick Coghlan; issue 1739468.)

The

hasattr()

function was catching and ignoring all errors, under the assumption

that they meant a

__getattr__()

method was failing somehow and the return value

o f

hasattr()

would therefore be

False

. This logic shouldn’t be applied to

KeyboardInterrupt

and

SystemExit

, however; Python 2.6 will no longer discard such

exceptions when

hasattr()

encounters them. (Fixed by Benjamin Peterson; issue

2196.)

When calling a function using the

syntax to provide keyword arguments, you are

no longer required to use a Python dictionary; any mapping will now work:

>>> def f(**kw):

... print sorted(kw)

...

>>> ud=UserDict.UserDict()

>>> ud['a'] = 1

>>> ud['b'] = 'string'

>>> f(**ud)

['a', 'b']

(Contributed by Alexander Belopolsky; issue 1686487.)

It’s also become legal to provide keyword arguments after a

*args

argument to a

function call.

>>> def f(*args, **kw):

... print args, kw

...

>>> f(1,2,3, *(4,5,6), keyword=13)

(1, 2, 3, 4, 5, 6) {'keyword': 13}

Previously this would have been a syntax error. (Contributed by Amaury Forgeot

d’Arc; issue 3473.)

A new builtin,

next(iterator, [default])

returns the next item from the specified

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iterator. If the default argument is supplied, it will be returned if iterator has been

exhausted; otherwise, the

StopIteration

exception will be raised. (Backported in

issue 2719.)

Tuples now have

index()

and

count()

methods matching the list type’s

index()

and

count()

methods:

>>> t = (0,1,2,3,4,0,1,2)

>>> t.index(3)

>>> t.count(0)

(Contributed by Raymond Hettinger)

The built-in types now have improved support for extended slicing syntax, accepting

various combinations of

(start, stop, step)

. Previously, the support was partial

and certain corner cases wouldn’t work. (Implemented by Thomas Wouters.)

Properties now have three attributes,

getter

setter

and

deleter

, that are

decorators providing useful shortcuts for adding a getter, setter or deleter function to

an existing property. You would use them like this:

class C(object):

@property

def x(self):

return self._x

@x.setter

def x(self, value):

self._x = value

@x.deleter

def x(self):

del self._x

class D(C):

@C.x.getter

def x(self):

return self._x * 2

@x.setter

def x(self, value):

self._x = value / 2

Several methods of the built-in set types now accept multiple iterables:

intersection()

intersection_update()

union()

update()

difference()

and

difference_update()

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>>> s=set('1234567890')

>>> s.intersection('abc123', 'cdf246') # Intersection between all inputs

set(['2'])

>>> s.difference('246', '789')

set(['1', '0', '3', '5'])

(Contributed by Raymond Hettinger.)

Many floating-point features were added. The

float()

function will now turn the

string

nan

into an IEEE 754 Not A Number value, and

+inf

and

-inf

into positive or

negative infinity. This works on any platform with IEEE 754 semantics. (Contributed

by Christian Heimes; issue 1635.)

Other functions in the

math

module,

isinf()

and

isnan()

, return true if their floating-

point argument is infinite or Not A Number. (issue 1640)

Conversion functions were added to convert floating-point numbers into hexadecimal

strings (issue 3008) . These functions convert floats to and from a string

representation without introducing rounding errors from the conversion between

decimal and binary. Floats have a

hex()

method that returns a string representation,

and the

float.fromhex()

method converts a string back into a number:

>>> a = 3.75

>>> a.hex()

'0x1.e000000000000p+1'

>>> float.fromhex('0x1.e000000000000p+1')

3.75

>>> b=1./3

>>> b.hex()

'0x1.5555555555555p-2'

A numerical nicety: when creating a complex number from two floats on systems that

support signed zeros (-0 and +0), the

complex()

constructor will now preserve the

sign of the zero. (Fixed by Mark T. Dickinson; issue 1507.)

Classes that inherit a

__hash__()

method from a parent class can set

__hash__ =

None

to indicate that the class isn’t hashable. This will make

hash(obj)

raise a

TypeError

and the class will not be indicated as implementing the

Hashable

ABC.

You should do this when you’ve defined a

__cmp__()

__eq__()

method that

compares objects by their value rather than by identity. All objects have a default

hash method that uses

id(obj)

as the hash value. There’s no tidy way to remove

the

__hash__()

method inherited from a parent class, so assigning

None

was

implemented as an override. At the C level, extensions can set

tp_hash

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PyObject_HashNotImplemented()

. (Fixed by Nick Coghlan and Amaury Forgeot d’Arc;

issue 2235.)

The

GeneratorExit

exception now subclasses

BaseException

instead of

Exception

This means that an exception handler that does

except Exception:

will not

inadvertently catch

GeneratorExit

. (Contributed by Chad Austin; issue 1537.)

Generator objects now have a

gi_code

attribute that refers to the original code

object backing the generator. (Contributed by Collin Winter; issue 1473257.)

The

compile()

built-in function now accepts keyword arguments as well as positional

parameters. (Contributed by Thomas Wouters; issue 1444529.)

The

complex()

constructor now accepts strings containing parenthesized complex

numbers, meaning that

complex(repr(cplx))

will now round-trip values. For

example,

complex('(3+4j)')

now returns the value (3+4j). (issue 1491866)

The string

translate()

method now accepts

None

as the translation table

parameter, which is treated as the identity transformation. This makes it easier to

carry out operations that only delete characters. (Contributed by Bengt Richter and

implemented by Raymond Hettinger; issue 1193128.)

The built-in

dir()

function now checks for a

__dir__()

method on the objects it

receives. This method must return a list of strings containing the names of valid

attributes for the object, and lets the object control the value that

dir()

produces.

Objects that have

__getattr__()

__getattribute__()

methods can use this to

advertise pseudo-attributes they will honor. (issue 1591665)

Instance method objects have new attributes for the object and function comprising

the method; the new synonym for

im_self

__self__

, and

im_func

is also available

__func__

. The old names are still supported in Python 2.6, but are gone in 3.0.

An obscure change: when you use the

locals()

function inside a

class

statement,

the resulting dictionary no longer returns free variables. (Free variables, in this case,

are variables referenced in the

class

statement that aren’t attributes of the class.)

Optimizations

The

warnings

module has been rewritten in C. This makes it possible to invoke

warnings from the parser, and may also make the interpreter’s startup faster.

(Contributed by Neal Norwitz and Brett Cannon; issue 1631171.)

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Type objects now have a cache of methods that can reduce the work required to find

the correct method implementation for a particular class; once cached, the

interpreter doesn’t need to traverse base classes to figure out the right method to

call. The cache is cleared if a base class or the class itself is modified, so the cache

should remain correct even in the face of Python’s dynamic nature. (Original

optimization implemented by Armin Rigo, updated for Python 2.6 by Kevin Jacobs;

issue 1700288.)

By default, this change is only applied to types that are included with the Python

core. Extension modules may not necessarily be compatible with this cache, so they

must explicitly add

Py_TPFLAGS_HAVE_VERSION_TAG

to the module’s

tp_flags

field to

enable the method cache. (To be compatible with the method cache, the extension

module’s code must not directly access and modify the

tp_dict

member of any of

the types it implements. Most modules don’t do this, but it’s impossible for the

Python interpreter to determine that. See issue 1878 for some discussion.)

Function calls that use keyword arguments are significantly faster by doing a quick

pointer comparison, usually saving the time of a full string comparison. (Contributed

by Raymond Hettinger, after an initial implementation by Antoine Pitrou; issue 1819.)

All of the functions in the

struct

module have been rewritten in C, thanks to work at

the Need For Speed sprint. (Contributed by Raymond Hettinger.)

Some of the standard built-in types now set a bit in their type objects. This speeds up

checking whether an object is a subclass of one of these types. (Contributed by Neal

Norwitz.)

Unicode strings now use faster code for detecting whitespace and line breaks; this

speeds up the

split()

method by about 25% and

splitlines()

by 35%.

(Contributed by Antoine Pitrou.) Memory usage is reduced by using pymalloc for the

Unicode string’s data.

The

with

statement now stores the

__exit__()

method on the stack, producing a

small speedup. (Implemented by Jeffrey Yasskin.)

To reduce memory usage, the garbage collector will now clear internal free lists when

garbage-collecting the highest generation of objects. This may return memory to the

operating system sooner.

Interpreter Changes

Two command-line options have been reserved for use by other Python implementations.

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The -J switch has been reserved for use by Jython for Jython-specific options, such as

switches that are passed to the underlying JVM. -X has been reserved for options

specific to a particular implementation of Python such as CPython, Jython, or IronPython.

If either option is used with Python 2.6, the interpreter will report that the option isn’t

currently used.

Python can now be prevented from writing

.pyc

.pyo

files by supplying the -B switch to

the Python interpreter, or by setting the

PYTHONDONTWRITEBYTECODE

environment variable

before running the interpreter. This setting is available to Python programs as the

sys.dont_write_bytecode

variable, and Python code can change the value to modify the

interpreter’s behaviour. (Contributed by Neal Norwitz and Georg Brandl.)

The encoding used for standard input, output, and standard error can be specified by

setting the

PYTHONIOENCODING

environment variable before running the interpreter. The

value should be a string in the form

. The

encoding part specifies the encoding’s name, e.g.

utf-8

latin-1

; the optional

errorhandler part specifies what to do with characters that can’t be handled by the

encoding, and should be one of “error”, “ignore”, or “replace”. (Contributed by Martin von

Loewis.)

New and Improved Modules

As in every release, Python’s standard library received a number of enhancements and

bug fixes. Here’s a partial list of the most notable changes, sorted alphabetically by

module name. Consult the

Misc/NEWS

file in the source tree for a more complete list of

changes, or look through the Subversion logs for all the details.

The

asyncore

and

asynchat

modules are being actively maintained again, and a

number of patches and bugfixes were applied. (Maintained by Josiah Carlson; see

issue 1736190 for one patch.)

The

bsddb

module also has a new maintainer, Jesús Cea Avion, and the package is

now available as a standalone package. The web page for the package is

www.jcea.es/programacion/pybsddb.htm. The plan is to remove the package from

the standard library in Python 3.0, because its pace of releases is much more

frequent than Python’s.

The

bsddb.dbshelve

module now uses the highest pickling protocol available, instead

of restricting itself to protocol 1. (Contributed by W. Barnes.)

The

cgi

module will now read variables from the query string of an HTTP POST

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request. This makes it possible to use form actions with URLs that include query

strings such as “/cgi-bin/add.py?category=1”. (Contributed by Alexandre Fiori and

Nubis; issue 1817.)

The

parse_qs()

and

parse_qsl()

functions have been relocated from the

cgi

module to the

urlparse

module. The versions still available in the

cgi

module will

trigger

PendingDeprecationWarning

messages in 2.6 (issue 600362).

The

cmath

module underwent extensive revision, contributed by Mark Dickinson and

Christian Heimes. Five new functions were added:

polar()

converts a complex number to polar form, returning the modulus and

argument of the complex number.

rect()

does the opposite, turning a modulus, argument pair back into the

corresponding complex number.

phase()

returns the argument (also called the angle) of a complex number.

isnan()

returns True if either the real or imaginary part of its argument is a

NaN.

isinf()

returns True if either the real or imaginary part of its argument is

infinite.

The revisions also improved the numerical soundness of the

cmath

module. For all

functions, the real and imaginary parts of the results are accurate to within a few

units of least precision (ulps) whenever possible. See issue 1381 for the details. The

branch cuts for

asinh()

atanh()

: and

atan()

have also been corrected.

The tests for the module have been greatly expanded; nearly 2000 new test cases

exercise the algebraic functions.

On IEEE 754 platforms, the

cmath

module now handles IEEE 754 special values and

floating-point exceptions in a manner consistent with Annex ‘G’ of the C99 standard.

A new data type in the

collections

module:

namedtuple(typename, fieldnames)

a factory function that creates subclasses of the standard tuple whose fields are

accessible by name as well as index. For example:

>>> var_type = collections.namedtuple('variable',

... 'id name type size')

>>> # Names are separated by spaces or commas.

>>> # 'id, name, type, size' would also work.

>>> var_type._fields

('id', 'name', 'type', 'size')

>>> var = var_type(1, 'frequency', 'int', 4)

>>> print var[0], var.id # Equivalent

1 1

>>> print var[2], var.type # Equivalent

int int

>>> var._asdict()

{'size': 4, 'type': 'int', 'id': 1, 'name': 'frequency'}

>>> v2 = var._replace(name='amplitude')

>>> v2

variable(id=1, name='amplitude', type='int', size=4)

Several places in the standard library that returned tuples have been modified to

return

namedtuple

instances. For example, the

Decimal.as_tuple()

method now

returns a named tuple with

sign

digits

, and

exponent

fields.

(Contributed by Raymond Hettinger.)

Another change to the

collections

module is that the

deque

type now supports an

optional maxlen parameter; if supplied, the deque’s size will be restricted to no more

than maxlen items. Adding more items to a full deque causes old items to be

discarded.

>>> from collections import deque

>>> dq=deque(maxlen=3)

>>> dq

deque([], maxlen=3)

>>> dq.append(1) ; dq.append(2) ; dq.append(3)

>>> dq

deque([1, 2, 3], maxlen=3)

>>> dq.append(4)

>>> dq

deque([2, 3, 4], maxlen=3)

(Contributed by Raymond Hettinger.)

The

module’s

Morsel

objects now support an

httponly

attribute. In some

browsers. cookies with this attribute set cannot be accessed or manipulated by

JavaScript code. (Contributed by Arvin Schnell; issue 1638033.)

A new window method in the

curses

module,

chgat()

, changes the display attributes

for a certain number of characters on a single line. (Contributed by Fabian Kreutz.)

# Boldface text starting at y=0,x=21

# and affecting the rest of the line.

stdscr.chgat(0, 21, curses.A_BOLD)

The

Textbox

class in the

curses.textpad

module now supports editing in insert

mode as well as overwrite mode. Insert mode is enabled by supplying a true value

for the insert_mode parameter when creating the

Textbox

instance.

The

datetime

module’s

strftime()

methods now support a

format code that

expands to the number of microseconds in the object, zero-padded on the left to six

places. (Contributed by Skip Montanaro; issue 1158.)

The

decimal

module was updated to version 1.66 of the General Decimal

Specification. New features include some methods for some basic mathematical

functions such as

exp()

and

log10()

>>> Decimal(1).exp()

Decimal("2.718281828459045235360287471")

>>> Decimal("2.7182818").ln()

Decimal("0.9999999895305022877376682436")

>>> Decimal(1000).log10()

Decimal("3")

The

as_tuple()

method of

Decimal

objects now returns a named tuple with

sign

digits

, and

exponent

fields.

(Implemented by Facundo Batista and Mark Dickinson. Named tuple support added

by Raymond Hettinger.)

The

difflib

module’s

SequenceMatcher

class now returns named tuples

representing matches, with

, and

size

attributes. (Contributed by Raymond

Hettinger.)

An optional

timeout

parameter, specifying a timeout measured in seconds, was

added to the

ftplib.FTP

class constructor as well as the

connect()

method. (Added

by Facundo Batista.) Also, the

FTP

class’s

storbinary()

and

storlines()

now take

an optional callback parameter that will be called with each block of data after the

data has been sent. (Contributed by Phil Schwartz; issue 1221598.)

The

reduce()

built-in function is also available in the

functools

module. In Python

3.0, the builtin has been dropped and

reduce()

is only available from

functools

;

currently there are no plans to drop the builtin in the 2.x series. (Patched by Christian

Heimes; issue 1739906.)

When possible, the

getpass

module will now use

/dev/tty

to print a prompt

message and read the password, falling back to standard error and standard input. If

the password may be echoed to the terminal, a warning is printed before the prompt

is displayed. (Contributed by Gregory P. Smith.)

The

glob.glob()

function can now return Unicode filenames if a Unicode path was

used and Unicode filenames are matched within the directory. (issue 1001604)

A new function in the

heapq

module,

merge(iter1, iter2, ...)

, takes any number

of iterables returning data in sorted order, and returns a new generator that returns

the contents of all the iterators, also in sorted order. For example:

>>> list(heapq.merge([1, 3, 5, 9], [2, 8, 16]))

[1, 2, 3, 5, 8, 9, 16]

Another new function,

heappushpop(heap, item)

, pushes item onto heap, then pops

off and returns the smallest item. This is more efficient than making a call to

heappush()

and then

heappop()

heapq

is now implemented to only use less-than comparison, instead of the less-

than-or-equal comparison it previously used. This makes

heapq

‘s usage of a type

match the

list.sort()

method. (Contributed by Raymond Hettinger.)

An optional

timeout

parameter, specifying a timeout measured in seconds, was

added to the

httplib.HTTPConnection

and

HTTPSConnection

class constructors.

(Added by Facundo Batista.)

Most of the

inspect

module’s functions, such as

getmoduleinfo()

and

getargs()

now return named tuples. In addition to behaving like tuples, the elements of the

return value can also be accessed as attributes. (Contributed by Raymond

Hettinger.)

Some new functions in the module include

isgenerator()

isgeneratorfunction()

and

isabstract()

The

itertools

module gained several new functions.

izip_longest(iter1, iter2, ...[, fillvalue])

makes tuples from each of the

elements; if some of the iterables are shorter than others, the missing values are set

to fillvalue. For example:

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