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HAPTER

-1. W

HAT

’

“D

IVE

NTO

YTHON

3”

❝

Isn’t this wherewecamein?

❞

—PinkFloyd,TheWall

-1.1.

.“

THE MINUSLEVEL

”

oureadthe original “

Dive Into Python” andmaybe evenboughtitonpaper.(Thanks!)Youalready

know Python2prettywell. You’re readyto take the plunge into Python3.…If allofthat is true,readon.

(Ifnone ofthatistrue, you’dbe betteroff

starting at the beginning.)

Python3comeswitha scriptcalled

2to3

.Learnit. Love it. Use it.

Porting Code toPython3with

2to3

isa

referenceofallthe thingsthat the

2to3

tool canfixautomatically.Since a lotofthosethingsare syntax

changes, it’s agoodstartingpointtolearnabout a lotofthesyntaxchangesinPython3. (

isnow a

function,

`x`

doesn’twork,

c.)

Case Study:Porting

chardet

to Python3documentsmy(ultimately successful)effort to porta non-trivial

library fromPython2 to Python3. Itmayhelpyou; itmaynot. There’sa fairlysteeplearning curve, since

youneedto kindofunderstand the libraryfirst, so youcanunderstandwhyitbrokeandhow Ifixedit. A

lot ofthe breakagecenters aroundstrings. Speaking ofwhich…

Strings. Whew.Where to start. Python2had“strings” and“Unicodestrings.” Python3 has “bytes” and

“strings.” Thatis, allstringsare nowUnicode strings, and ifyouwant to dealwitha bag ofbytes, you use

the new

bytes

type. Python3will never implicitlyconvertbetweenstringsandbytes, so ifyou’re notsure

whichone youhave atanygivenmoment,yourcode willalmostcertainlybreak. Read

the Stringschapter

formoredetails.

Bytesvs. stringscomesupagainandagainthroughoutthe book.

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• In

Files, you’lllearnthe difference betweenreading filesin“binary” and“text” mode.Reading (andwriting!)

filesintext mode requires an

encoding

parameter. Some text filemethodscountcharacters, butother

methods count bytes.Ifyour codeassumes thatone character==onebyte, itwillbreakonmulti-byte

characters.

• In

HTTP

WebServices,the

httplib2

module fetches headersanddata over

HTTP

headersare

returned as strings,but the

HTTP

bodyisreturnedasbytes.

• In

Serializing PythonObjects, you’ll learnwhythe

pickle

moduleinPython3defines a new data format that

isbackwardly incompatible with Python2.(Hint: it’sbecause ofbytes and strings.) Also

JSON

,whichdoesn’t

support the

bytes

typeat all.I’ll showyouhowto hack aroundthat.

• In

Case study:porting

chardet

to Python3, it’sjusta bloodymessofbytesandstringseverywhere.

Evenifyoudon’tcare aboutUnicode(oh butyouwill), you’ll want to readabout

string formattinginPython

3, whichiscompletelydifferentfromPython2.

Iteratorsare everywhere inPython 3,andIunderstandthema lot betterthanIdidfiveyears ago whenI

wrote “Dive Into Python”. Youneedto understand themtoo, because lotsoffunctionsthatusedto return

lists inPython2will nowreturniteratorsinPython3. At a minimum,youshouldread

the second halfof

the Iteratorschapterand

the secondhalfoftheAdvancedIterators chapter.

Bypopular request,I’ve added anappendixon

SpecialMethodNames, whichis kindoflike

thePythondocs

“Data Model” chapter butwithmore snark.

WhenIwaswriting “Dive Into Python”, all ofthe available XML librariessucked.ThenFredrik Lundhwrote

ElementTree,whichdoesn’tsuck atall. The Pythongodswisely

incorporated ElementTreeinto thestandard

library,andnowitformsthe basisfor

mynew XML chapter. Theoldwaysofparsing XML are still around,

butyoushouldavoidthem,because theysuck!

Also newinPython—notinthe language butinthecommunity—istheemergence of coderepositories

The PythonPackage Index(PyPI).Pythoncomes withutilities to package your code instandardformats

anddistribute those packagesonPyPI. Read

Packaging PythonLibrariesfor details.

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HAPTER

0. I

NSTALLING

YTHON

❝

Tempora mutanturnos et mutamurin illis.(Timeschange,and wechangewith them.)

❞

—ancient Romanproverb

0.1. D

IVING

elcometo Python3. Let's dive in.Inthischapter, you'll install the versionofPython3 that'sright

foryou.

0.2.W

HICH

YTHON

IGHT

Thefirst thingyouneedto do withPythonis installit. Ordoyou?

Ifyou're usinganaccountona hostedserver, your

ISP

mayhavealreadyinstalled Python3.Ifyou’re running

Linuxat home, youmayalreadyhave Python3, too.Mostpopular GNU/Linuxdistributionscome with

Python2inthe default installation; asmall butgrowing numberofdistributionsalso includePython3.Mac

OS Xincludesa command-line versionofPython2, butasofthiswriting it does not include Python3.

Microsoft WindowsdoesnotcomewithanyversionofPython. Butdon’tdespair!Youcanpoint-and-click

yourwaythroughinstalling Python, regardless ofwhatoperating systemyouhave.

Theeasiest wayto check forPython3onyourLinuxorMacOSXsystemisto get to a commandline. On

Linux, look inyour

Applications

menufor a programcalled

Terminal

.(It maybe ina submenulike

Accessories

System

.) OnMacOS X, there isanapplicationcalled

Terminal.app

inyour

/Application/

Utilities/

folder.

Once you’reata commandline prompt, justtype

python3

(all lowercase, nospaces)andsee what happens.

OnmyhomeLinuxsystem, Python3isalready installed, andthiscommandgetsmeinto the Python

interactiveshell.

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mark@atlantis:~$ python3

Python 3.0.1+ (r301:69556, Apr 15 2009, 17:25:52)

[GCC 4.3.3] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>>

(Type

exit()

and press

ENTER

to exitthePythoninteractive shell.)

webhostingprovideralso runsLinuxand providescommand-line access,but myserverdoesnothave

Python3installed. (Boo!)

mark@manganese:~$ python3

bash: python3: command not found

So back to the question thatstartedthissection, “WhichPythonisrightforyou?” Whicheverone runson

the computer youalreadyhave.

[Read onfor Windows instructions,or skipto

Installing onMacOS X,

Installing onUbuntuLinux, or

Installing onOtherPlatforms.]

⁂

0.3.I

NSTALLINGON

ICROSOFT

INDOWS

Windowscomesintwo architecturesthesedays: 32-bitand64-bit. Ofcourse,therearelotsofdifferent

versions ofWindows—XP, Vista, Windows 7—butPythonrunsonall ofthem.The more important

distinctionis32-bitv. 64-bit.Ifyouhave no idea what architecture you’re running,it’sprobably32-bit.

Visit

python.org/download/

anddownload the appropriatePython3Windowsinstaller for yourarchitecture.

Your choiceswilllook something like this:

• Python3.1 Windows installer(Windowsbinary—does not include source)

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• Python3.1 Windows AMD64 installer(WindowsAMD64 binary—doesnotinclude source)

Idon’twant to include direct download linkshere, because minorupdatesofPython happenall the time and

Idon’twant to be responsiblefor youmissing important updates.Youshouldalwaysinstallthemostrecent

version ofPython3.xunlessyouhavesomeesotericreasonnotto.

Once yourdownloadis complete, double-

click the

.msi

file.Windowswillpopupa

securityalert,since you’re aboutto be

running executablecode. The officialPython

installer is digitallysignedbythe

Python

Software Foundation,thenon-profit

corporationthatoverseesPython

development. Don’tacceptimitations!

Click the

Run

buttonto launchthePython3

installer.

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Thefirst questiontheinstaller

willask youiswhetheryou

want to install Python3forall

usersor just for you.The

default choice is“install forall

users,” whichisthe best

choice unless youhave a good

reasonto choose otherwise.

(One possible reasonwhyyou

wouldwant to “install just for

me” is thatyouare installing

Pythononyourcompany’s

computer and youdon’thave

administrative rightsonyour

Windowsaccount.But then,

whyareyouinstalling Python

without permissionfrom your

company’s Windows administrator?Don’tgetme introublehere!)

Click the

buttonto acceptyourchoiceofinstallation type.

Next, the installerwill prompt

youto choose adestination

directory. The default for all

versions ofPython3.1.xis

C:\Python31\

,whichshould

workwell for most users

unless youhave a specific

reasonto changeit. Ifyou

maintaina separate drive letter

forinstallingapplications,you

canbrowseto it using the

embeddedcontrols,or simply

type the pathname inthe box

below. Youarenot limited to

installing Python onthe

drive;youcaninstall itonany

drive,inanyfolder.

Click the

buttonto acceptyourchoiceofdestination directory.

Thenextpage looks

complicated, butit’s not really.

Like manyinstallers,youhave

the optionnot to install every

single component ofPython3.

Ifdisk spaceisespeciallytight,

youcanexclude certain

components.

◦ RegisterExtensions allows

youto double-click Python

scripts (

.py

files)andrun

them. Recommendedbut not

required.(Thisoptiondoesn’t

require anydisk space,so

there islittle pointin

excluding it.)

◦ Tcl/Tk isthegraphicslibraryusedbythe PythonShell, whichyouwill use throughoutthisbook.Istrongly

recommendkeeping thisoption.

◦ Documentation installsa helpfile thatcontainsmuchoftheinformationon

docs.python.org

Recommended ifyouare ondialuporhave limited Internetaccess.

◦ UtilityScripts includesthe

2to3.py

scriptwhichyou’ll learnabout

later inthisbook.Requiredifyouwant

to learnabout migrating existing Python 2codeto Python3.Ifyouhave no existing Python2code,youcan

skipthisoption.

◦ Test Suite isa collectionofscripts used to testthePythoninterpreteritself. We willnotuseitinthis

book, norhave Ieveruseditinthe course ofprogramming inPython.Completelyoptional.

Ifyou’reunsure how much

disk space youhave,click the

Disk Usage

button.The

installer will list your drive

letters, compute howmuch

space isavailable oneach

drive,andcalculate howmuch

wouldbe leftafter installation.

Click the

buttonto return

to the“Customizing Python”

page.

Ifyoudecide to excludean

option, selectthedrop-down

button before the optionand

select“Entire feature will be

unavailable.” For example,

excluding the testsuite will

save youawhopping 7908

ofdiskspace.

Click the

buttonto

accept yourchoice ofoptions.

Theinstallerwillcopyallthe

necessaryfilesto yourchosen

destinationdirectory. (This

happens so quickly, Ihadto

tryit three times to evenget

ascreenshotofit!)

Click the

Finish

buttonto

exit the installer.

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