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Misc/FAQ
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......@@ -3,20 +3,20 @@ Newsgroups: comp.lang.python,comp.answers,news.answers
Followup-to: comp.lang.python
From: guido@cnri.reston.va.us (Guido van Rossum)
Reply-to: guido@cnri.reston.va.us (Guido van Rossum)
Expires: Fri, 1 Nov 1996 00:00:00 GMT
Supersedes: <DFMAv8.3Hp@cwi.nl>
Expires: Sun, 1 Dec 1996 00:00:00 GMT
Supersedes: <DxJ3t1.CJv@cwi.nl>
Approved: news-answers-request@MIT.Edu
Archive-name: python-faq/part1
Submitted-by: Guido van Rossum <guido@cnri.reston.va.us>
Version: 1.34
Last-modified: 9 September 1996
Version: $Revision$
Last-modified: 11 September 1996
This article contains answers to Frequently Asked Questions about
Python (an object-oriented interpreted programming language -- see
the answer to question 1.1 for a short overview).
Copyright 1993-1995 Guido van Rossum. Unchanged electronic
Copyright 1993-1996 Guido van Rossum. Unchanged electronic
redistribution of this FAQ is allowed. Printed redistribution only
with permission of the author. No warranties.
......@@ -214,19 +214,16 @@ Here's an overview of the questions per chapter:
7. Using Python on non-UNIX platforms
7.1. Q. Is there a Mac version of Python?
7.2. Q. Is there a DOS version of Python?
7.3. Q. Is there a Windows 3.1(1) version of Python?
7.4. Q. Is there a Windows NT version of Python?
7.5. Q. Is there a Windows 95 version of Python?
7.6. Q. Is there an OS/2 version of Python?
7.7. Q. Is there a VMS version of Python?
7.8. Q. What about IBM mainframes, or other non-UNIX platforms?
7.9. Q. Where are the source or Makefiles for the non-UNIX versions?
7.10. Q. What is the status and support for the non-UNIX versions?
7.11. Q. I have a PC version but it appears to be only a binary.
Where's the library?
7.12. Q. Where's the documentation for the Mac or PC version?
7.13. Q. The Mac (PC) version doesn't seem to have any facilities for
7.2. Q. Are there DOS and Windows versions of Python?
7.3. Q. Is there an OS/2 version of Python?
7.4. Q. Is there a VMS version of Python?
7.5. Q. What about IBM mainframes, or other non-UNIX platforms?
7.6. Q. Where are the source or Makefiles for the non-UNIX versions?
7.7. Q. What is the status and support for the non-UNIX versions?
7.8. Q. I have a PC version but it appears to be only a binary.
Where's the library?
7.9. Q. Where's the documentation for the Mac or PC version?
7.10. Q. The Mac (PC) version doesn't seem to have any facilities for
creating or editing programs apart from entering it interactively, and
there seems to be no way to save code that was entered interactively.
How do I create a Python program on the Mac (PC)?
......@@ -1101,72 +1098,74 @@ STDWIN-related lines so it's easy to miss it.
A. Depending on what platform(s) you are aiming at, there are several.
Currently supported solutions:
- There's a neat object-oriented interface to the Tcl/Tk widget set,
called Tkinter. As of python 1.1, it is part of the standard Python
distribution -- all you need to do is enable it in Modules/Setup
(provided you have already installed Tk and Tcl). This is probably
the easiest to install and use, and the most complete widget set. It
is also very likely that in the future the standard Python GUI API
will be based on or at least look very much like the Tkinter
interface. For more info about Tk, including pointers to the source,
see the Tcl/Tk home page <URL:http://www.sunlabs.com/research/tcl/>.
- The standard Python distribution comes with an interface to STDWIN,
a platform-independent low-level windowing interface. You have to ftp
the source for STDWIN separately,
e.g. <URL:ftp://ftp.cwi.nl/pub/stdwin/> or gatekeeper.dec.com in
pub/misc/stdwin <URL:ftp://gatekeeper.dec.com/pub/misc/stdwin/>.
STDWIN runs under X11 or the Mac; a Windows port has been attempted
but I can't seem to get it working. Note that STDWIN is really not
powerful enough to implement a modern GUI (no widgets, etc.) and that
I don't have the time to maintain or extend it, so you may be better
off using Tkinter or the Motif interface, unless you require
portability to the Mac (which is also offered by SUIT, by the way --
see below).
- For SGI IRIX only, there's an interface to the complete GL (Graphics
Library -- low level but very good 3D capabilities) as well as to
FORMS (a buttons-and-sliders-etc package built on top of GL by Mark
Overmars -- ftp'able from <URL:ftp://ftp.cs.ruu.nl/pub/SGI/FORMS/>).
called Tkinter. It is part of the standard Python distribution and
well-supported -- all you need to do is build and install Tcl/Tk and
enable the _tkinter module and the TKPATH definition in Modules/Setup
when building Python. This is probably the easiest to install and
use, and the most complete widget set. It is also very likely that in
the future the standard Python GUI API will be based on or at least
look very much like the Tkinter interface. For more info about Tk,
including pointers to the source, see the Tcl/Tk home page
<URL:http://www.sunlabs.com/research/tcl/>. Tcl/Tk is now fully
portable to the Mac and Windows platforms (NT and 95 only); you need
Python 1.4beta3 or later and Tk 4.1patch1 or later.
- There's an interface to X11, including the Athena and Motif widget
sets (and a few individual widgets, like Mosaic's HTML widget and
SGI's GL widget) in the Extensions set, which is separately ftp'able
<URL:ftp://ftp.python.org/pub/python/src/extensions.tar.gz>.
- There's an interface to SUIT, the U of Virginia's Simple User
Interface Toolkit; it can be ftp'ed from
<URL:ftp://uvacs.cs.virginia.edu/pub/suit/python/SUIT_python.tar.Z>.
A PC binary of Python 1.0.2 compiled with DJGPP and with SUIT support
built-in has been made available by Antonio Costa
<URL:ftp://asterix.inescn.pt/pub/PC/python/pyt102su.exe> (a
self-extracting archive). Note that the UVa people themselves have
expressed doubts about SUIT, and are planning to build a Python GUI
API based upon Tk (though not necessarily on Tkinter); see
<URL:http://server.cs.virginia.edu/~tnb2d/IT/IT.html>.
- There's an interface to WAFE, a Tcl interface to the X11 Motif and
Athena widget sets. Last I heard about it it was included in the WAFE
1.0 prerelease
<URL:ftp://ftp.wu-wien.ac.at/pub/src/X11/wafe/wafe-1.0.tar.gz-prerelease>.
- The NT port by Mark Hammond (see question 7.4) includes an interface
to the Microsoft Foundation Classes and a Python programming
environment using it that's written mostly in Python. See
<URL:ftp://ftp.python.org/pub/python/nt/>.
SGI's GL widget) available from
<URL:ftp://ftp.python.org/pub/python/src/X-extension.tar.gz>.
Support by Sjoerd Mullender <sjoerd@cwi.nl>.
- The Mac port has a rich and ever-growing set of modules that support
the native Mac toolbox calls. See the documentation that comes with
the Mac port. See <URL:ftp://ftp.python.org/pub/python/mac>. Support
by Jack Jansen <jack@cwi.nl>.
- The NT port supported by Mark Hammond <MHammond@skippinet.com.au>
(see question 7.2) includes an interface to the Microsoft Foundation
Classes and a Python programming environment using it that's written
mostly in Python. See
<URL:ftp://ftp.python.org/pub/python/pythonwin/>.
- There's an object-oriented GUI based on the Microsoft Foundation
Classes model called WPY, supported by Jim Ahlstrom <jim@interet.com>.
Programs written in WPY run unchanged and with native look and feel on
Windows NT/95, Windows 3.1 (using win32s), and on Unix (using Tk).
Source and binaries for Windows and Linux are available in
<URL:ftp://ftp.python.org/pub/python/wpy/>.
Obsolete or minority solutions:
- There's an interface to wxWindows. wxWindows is a portable GUI
class library written in C++. It supports XView, Motif, MS-Windows as
targets. There is some support for Macs and CURSES as well. wxWindows
preserves the look and feel of the underlying graphics toolkit. See
the wxPython WWW page at
targets. There is some support for Macs and CURSES as well.
wxWindows preserves the look and feel of the underlying graphics
toolkit. See the wxPython WWW page at
<URL:http://www.aiai.ed.ac.uk/~jacs/wx/wxpython/wxpython.html>.
- There's an object-oriented GUI based on the Microsoft Foundation
Classes model called WPY. Programs written in WPY run unchanged and
with native look and feel on NT, Windows 3.1 (using win32s) and on
Unix (using Tk). Source and binaries for NT and Linux are available
in <URL:ftp://ftp.python.org/pub/python/wpy>.
Support for wxPython (by Harri Pasanen <pa@tekla.fi>) appears
to have a low priority.
- For SGI IRIX only, there are unsupported interfaces to the complete
GL (Graphics Library -- low level but very good 3D capabilities) as
well as to FORMS (a buttons-and-sliders-etc package built on top of GL
by Mark Overmars -- ftp'able from
<URL:ftp://ftp.cs.ruu.nl/pub/SGI/FORMS/>). This is probably also
becoming obsolete, as OpenGL takes over.
- There's an interface to STDWIN, a platform-independent low-level
windowing interface for Mac and X11. This is totally unsupported and
rapidly becoming obsolete. The STDWIN sources are at
<URL:ftp://ftp.cwi.nl/pub/stdwin/>. (For info about STDWIN 2.0,
please refer to Steven Pemberton <steven@cwi.nl> -- I believe it is
also dead.)
- There once was an interface to WAFE, a Tcl interface to the X11
Motif and Athena widget sets. WAFE is at
<URL:ftp://ftp.wu-wien.ac.at/pub/src/X11/wafe/>. It's not clear what
the status of the Python support is.
- (The Fresco port that was mentioned in earlier versions of this FAQ
no longer seems to exist. Inquire with Mark Linton.)
......@@ -1213,7 +1212,7 @@ can prove by looking at the code that this can't happen (e.g. because
b is a constant or has a type that can never be false), but in general
this can be a problem.
Steve Majewski (or was it Tim Peters?) suggested the following
Tim Peters (who wishes it was Steve Majewski) suggested the following
solution: (a and [b] or [c])[0]. Because [b] is a singleton list it
is never false, so the wrong path is never taken; then applying [0] to
the whole thing gets the b or c that you really wanted. Ugly, but it
......@@ -1343,11 +1342,11 @@ alias. Incidentally, this trick is also handy if you want to decide
dynamically (e.g. depending on availability of resources) which base
class to use. Example:
BaseAlias = <real base class>
class Derived(BaseAlias):
def meth(self):
BaseAlias.meth(self)
...
BaseAlias = <real base class>
class Derived(BaseAlias):
def meth(self):
BaseAlias.meth(self)
...
4.26. Q. How can I find the methods or attributes of an object?
......@@ -1525,19 +1524,19 @@ XtAddInput() call, which allows you to register a callback function
which will be called from the Tk mainloop when I/O is possible on a
file descriptor. Here's what you need:
from Tkinter import tkinter
tkinter.createfilehandler(file, mask, callback)
from Tkinter import tkinter
tkinter.createfilehandler(file, mask, callback)
The file may be a Python file or socket object (actually, anything
with a fileno() method), or an integer file descriptor. The mask is
one of the constants tkinter.READABLE or tkinter.WRITABLE. The
callback is called as follows:
callback(file, mask)
callback(file, mask)
You must unregister the callback when you're done, using
tkinter.deletefilehandler(file)
tkinter.deletefilehandler(file)
Note: since you don't know *how many bytes* are available for reading,
you can't use the Python file object's read or readline methods, since
......@@ -1656,10 +1655,10 @@ created by the expression l[:].
- For dictionaries, the following function returns a clone:
def dictclone(o):
n = {}
for k in o.keys(): n[k] = o[k]
return n
def dictclone(o):
n = {}
for k in o.keys(): n[k] = o[k]
return n
- Finally, for generic objects, the "copy" module defines two
functions for copying objects. copy.copy(x) returns a copy as shown
......@@ -1999,8 +1998,8 @@ that a lambda form yields) is assigned!
6.10. Q. Why don't lambdas have access to variables defined in the
containing scope?
A. Because they are implemented as ordinary functions. See question
4.5 above.
A. Because they are implemented as ordinary functions.
See question 4.5 above.
6.11. Q. Why can't recursive functions be defined inside other functions?
......@@ -2123,58 +2122,43 @@ off-the-shelf technology.
A. Yes, see the "mac" subdirectory of the distribution sites,
e.g. <URL:ftp://ftp.python.org/pub/python/mac/>.
7.2. Q. Is there a DOS version of Python?
A. Yes, see the "pc" subdirectory of the distribution sites,
e.g. <URL:ftp://ftp.python.org/pub/python/pc/>.
7.2. Q. Are there DOS and Windows versions of Python?
7.3. Q. Is there a Windows 3.1(1) version of Python?
A. Yes. There is a plethora of not-always-compatible versions. See
the "pythonwin", "wpy", "nt" and "pc" subdirectories of the
distribution sites. A quick comparison:
A. Yes, also see the "pc" subdirectory of the distribution sites,
e.g. <URL:ftp://ftp.python.org/pub/python/pc/>. You may also be able
to run either of the Windows NT versions (see next question) if you
have Microsoft's "win32s".
PythonWin: Extensive support for the 32-bit native Windows API and GUI
building using MFC. Windows NT and Windows 95 only (and Windows
3.1(1) using win32s, until Microsoft stops supporting it :-( ).
<URL:ftp://ftp.python.org/pub/python/pythonwin/>.
7.4. Q. Is there a Windows NT version of Python?
WPY: Ports to DOS, Windows 3.1(1), Windows 95, Windows NT and OS/2.
Also contains a GUI package that offers portability between Windows
(not DOS) and Unix, and native look and feel on both.
<URL:ftp://ftp.python.org/pub/python/wpy/>.
A. There are two, both sporting DLL support for dynamic loading of
Python modules, and extensions to access the Win32 GUI API.
Mark Hammond <MHammond@cmutual.com.au> maintains an NT port which
includes an interface to the Microsoft Foundation Classes and a Python
programming environment using it that's written mostly in Python. See
NT: Basic ports built straight from the 1.4 distribution for Windows
95 and Windows NT. This will eventually provide core support for
both PythonWin and WPY on all 32-bit Microsoft platforms.
<URL:ftp://ftp.python.org/pub/python/nt/>.
Jim Ahlstrom's WPY portable GUI runs on Windows NT and is modeled
after the Microsoft Foundation Classes. Source and binaries are
available in <URL:ftp://ftp.python.org/pub/python/wpy>.
Sam Rushing <rushing@squirl.oau.org> once announced he knows how to
build Python for the Windows NT on the DEC Alpha AXP.
Note that currently there is no unified compilation environment for
all NT platforms -- hopefully Microsoft will fix this with the release
of Visual C++ 2.0.
7.5. Q. Is there a Windows 95 version of Python?
A. The Windows NT versions might work, otherwise the Windows 3.1(1)
version should work (isn't Windows 95 supposed to be backwards
compatible?).
PC: Old, unsupported ports to DOS, Windows 3.1(1) and OS/2.
<URL:ftp://ftp.python.org/pub/python/pc/>.
7.6. Q. Is there an OS/2 version of Python?
7.3. Q. Is there an OS/2 version of Python?
A. Yes, also see the "pc" subdirectory of the distribution sites,
e.g. <URL:ftp://ftp.python.org/pub/python/pc/>.
A. Yes, see the "pc" and "wpy" subdirectory of the distribution sites
(see above).
7.7. Q. Is there a VMS version of Python?
7.4. Q. Is there a VMS version of Python?
A. Donn Cave <donn@cac.washington.edu> did a partial port. The
results of his efforts are on public display in
<<URL:ftp://ftp.python.org/pub/python/contrib/vms.tar.gz/>. Someone
else is working on a more complete port, for details watch the list.
7.8. Q. What about IBM mainframes, or other non-UNIX platforms?
7.5. Q. What about IBM mainframes, or other non-UNIX platforms?
A. I haven't heard about these, except I remember hearing about an
OS/9 port and a port to Vxworks (both operating systems for embedded
......@@ -2183,12 +2167,12 @@ newsgroup and ask there, you may find exactly what you need. For
example, a port to MPE/iX 5.0 on HP3000 computers was just announced,
see <URL:http://www.allegro.com/software/>.
7.9. Q. Where are the source or Makefiles for the non-UNIX versions?
7.6. Q. Where are the source or Makefiles for the non-UNIX versions?
A. The standard sources can (almost) be used. Additional sources can
be found in the platform-specific subdirectories of the distribution.
7.10. Q. What is the status and support for the non-UNIX versions?
7.7. Q. What is the status and support for the non-UNIX versions?
A. I don't have access to most of these platforms, so in general I am
dependent on material submitted by volunteers(*). However I strive to
......@@ -2199,7 +2183,7 @@ version to the various non-UNIX platforms should be easy.
(*) For the Macintosh, that volunteer is me, with help from Jack
Jansen <jack@cwi.nl>.
7.11. Q. I have a PC version but it appears to be only a binary.
7.8. Q. I have a PC version but it appears to be only a binary.
Where's the library?
A. You still need to copy the files from the distribution directory
......@@ -2222,12 +2206,12 @@ as follows (talking to a DOS prompt):
C> SET PYTHONPATH=C:\misc\python\lib
7.12. Q. Where's the documentation for the Mac or PC version?
7.9. Q. Where's the documentation for the Mac or PC version?
A. The documentation for the Unix version also applies to the Mac and
PC versions. Where applicable, differences are indicated in the text.
7.13. Q. The Mac (PC) version doesn't seem to have any facilities for
7.10. Q. The Mac (PC) version doesn't seem to have any facilities for
creating or editing programs apart from entering it interactively, and
there seems to be no way to save code that was entered interactively.
How do I create a Python program on the Mac (PC)?
......
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