...Python packages without
system-administrator access, and automated testing of Python software
across multiple Python versions, among other uses.
Existing virtual environment tools suffer from lack of support from
the behavior of Python itself. Tools such as rvirtualenv, which do
not copy the Python binary into the virtual environment, cannot
provide reliable isolation from system site directories. Virtualenv,
which does copy the Python binary, is forced to duplicate much of
Python's site modul...
...Python's interpreted nature was also a benefit: Code ideas can easily be
tested in the Python interactive shell, and lack of a compilation phase makes
for a shorter edit/test cycle.
All of these factors combine to make Python a terrific alternative to C++ and
Java as a general purpose programming language. ForecastWatch.com was made
possible because of the ease of programming complex tasks in Python, and the
rapid development that Python allows.
About the Author
Eric Floehr specializes in larg...
PEP 215: String Interpolation
PEP 292: Simpler String Substitutions
PEP 3101: Advanced String Formatting
PEP 498: Literal string formatting
...Python executable and any script will behave.
/> python foo/myscript.py
sys.path == 'foo'
sys.path == 'foo/__pypackages__/3.8/lib'
#! /usr/bin/env python3
foo> python /usr/bin/ansible
foo> python myscript.py
sys.path == '.'
sys.path == './__pypackages__/3.8/lib'
foo> python -m bottle
We have a project directory called foo an...
...Python. It allows Python to talk to SDL, a cross-platform, multimedia library.
Because it needs to be compiled for each platform and each Python version,
there can be a lag when a new Python version comes along.
is the newcomer, based on OpenGL. Because
it is a pure Python package, it can be used as is
even when a new Python version is released (except for the Python 2 to Python
Python for secretaries:
A resource site aimed at showing business users how t...
$ cd python
$ git branch v1 origin/v1
The first command clones remote repository into local directory
python, creates a new local branch master, sets
remotes/origin/master as its upstream remote-tracking branch and
checks it out into the working directory.
The last command creates a new local branch v1 and sets
remotes/origin/v1 as its upstream remote-tracking branch.
The same result can be achieved with commands:
$ git clone -b v1 https://git.python.org/python.git
$ cd p...
Cut/Copy/Paste items in IDLE right click context menu
Getting Started with Python
IDLE breakpoint facility undocumented, Deily, Ned
IDLE: calltips mishandle raw strings and other examples,
...Python lends itself to inline documentation. With its built-in
docstring syntax, a limited form of Literate Programming is easy to
do in Python. However, there are no satisfactory standard tools for
extracting and processing Python docstrings. The lack of a standard
toolset is a significant gap in Python's infrastructure; this PEP aims
to fill the gap.
The issues surrounding docstring processing have been contentious and
difficult to resolve. This PEP proposes a generic Docstring
Python was not our first choice as the main programming language it was
a coincidence. When we started our project we was very proficient in
Perl and completely unaware of Python: so we chose Perl.
We discovered Python when we decided that we had to substitute the
PerlTK user interface with a Web-based one. We found Zope, and after
some attempts to integrate Perl with Zope, we switched to Python. To
make a log story short, at the end we dropped Zope but kept using
Python (and rewrote the...
...Python 2.4 source tree.
String Formatting Operations
Identifiers and Keywords
Guido's python-dev posting from 21-Jul-2002
...python.exe on Windows and
pythonX.Y on other platforms) allows execution from the command
line, from standard input, and does not have any hooks enabled by
Our recommendation is that production machines should use a modified
entry point instead of the default. Once outside of the development
environment, there is rarely a need for the flexibility offered by the
default entry point.
In this section, we describe a hypothetical spython entry point
(spython.exe on Windows; spythonX.Y on oth...
...Python logo (with some
permitted perspective added, as if logo was stamped on side of a crate).
The kind Jonathan Hosmer <jon at pythonforios.com> with whom we worked out the
name "Python for iOS" for his Python distribution (modified from the confusing
iPython, which is similar to the older IPython shell) decided to offer to PSF
members complimentary licenses to his distribution which I distributed to some
PSF members (including Guido). FWIW, Jonathan offered more free copies t...
...Python 2.1.1 (final) ?
The following bugs were fixed:
[ #441664 ] Python crash on del of a slice of a mmap
[ #438050 ] configure doesn't look for poll.h in sys
[ #437487 ] 2.1 build on Solaris fails if CC is set
[ #441527 ] unixccompiler preprocessor broken
What's New in Python 2.1.1c1 ?
Python 2.1.1 comes with the new, GPL-compatible PSF licence.
Several insecurities in dict comparison as well as a scoping bug,
that could lead to the Python interpreter crashing were fixed.
Python should ...
The site-packages directory can be used for packages that are
likely to depend on the Python version (e.g. package containing shared
libraries or using new features). The site-python directory is used
for backward compatibility with Python 1.4 and for pure Python
packages or modules that are not sensitive to the Python version
Recommended use of these directories is to place each package in a
subdirectory of its own in either ...
...Python identifier, not a string.
The East Asian word for ten looks like a plus sign,
so 十= 10 is a complete Python statement. (The “十” is a word: “ten”
rather than “10”.)
The converse also applies – some symbols look like letters – but since
Python does not allow arbitrary symbols in identifiers, this is not an
Numeric literals in Python only use the ASCII digits 0-9 (and non-digits such
as . or e).
However, when numbers are converted from strings, such as in ...
argparse in IPython
argparse in Debian
(1, 2) 2007-01-03 request for argparse in the standard library
2009-06-09 request for argparse in the standard library
BDFL-Delegate:Guido van Rossum <guido at python.org>
Post-History:01-Mar-2019, 16-Oct-2019, 02-Dec-2019, 04-Feb-2020,
showing people comparison operators etc. in the interactive shell,
I think this is a bit ugly:
>>> a = 13
>>> b = 12
>>> a > b
If this was:
>>> a > b
it would require a millisecond less thinking each time a 0 or 1
There's also the issue (which I've seen baffling even experienced
Pythonistas who had been away from the language for a while) that
if you see:
>>> cmp(a, b)
Tracker issue for PEP 565 implementation
First python-dev discussion thread
Second python-dev discussion thread
IPython's DeprecationWarning auto-configuration
Python Success Stories
First published in Linux Journal, May 2000.
Copyright 2000 Specialized Systems Consultants, Inc. All rights reserved.
My first look at Python was an accident, and I didn't much like what I
saw at the time. It was early 1997, and Mark Lutz's book Programming
Python from O'Reilly & Associates had recently come out. O'Reilly books
occasionally land on my doorstep, selected from among the new releases
by some mysterious benefactor inside the organization u...