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• Standard Exception Classes in Python 1.5

  ...ing in its error handling. Non-fatal Breakage An examples of the first kind of breakage is code that attempts to print the exception name, e.g. try: 1/0 except: print "Sorry:", sys.exc_type, ":", sys.exc_value With string-based exceptions, this would print something like Sorry: ZeroDivisionError : integer division or modulo With class-based exceptions, it will print Sorry: exceptions.ZeroDivisionError : integer division or modulo The f...

• Debugging Reference Count Problems

  ...in the manual, reading its source usually gives a clue.) So says I (beginning to talk to self), why not print the environment in which the functions are being run to see what's going on... no sooner said than done. And the error disappeared! Take the printing line out -- error reappears (iterate three or four times in disbelief). This is a typical example of Heisenberg's law applied to programs: you can't observe something without influencing it. I'm using: printf(" ...

• What is Python? Executive Summary

  ...incredibly fast. Debugging Python programs is easy: a bug or bad input will never cause a segmentation fault. Instead, when the interpreter discovers an error, it raises an exception. When the program doesn't catch the exception, the interpreter prints a stack trace. A source level debugger allows inspection of local and global variables, evaluation of arbitrary expressions, setting breakpoints, stepping through the code a line at a time, and so on. The debugger is written in Python its...

• Unifying types and classes in Python 2.2

  ...instance, subclasses should override 'init' instead of __init__ - the __init__ method is called each time the constructor is called. For example: >>> class MySingleton(Singleton): ... def init(self): ... print "calling init" ... def __init__(self): ... print "calling __init__" ... >>> x = MySingleton() calling init calling __init__ >>> assert x.__class__ is MySingleton >>> y = MySingleton() calling __init...

• Unifying types and classes in Python 2.2

  ...instance, subclasses should override 'init' instead of __init__ - the __init__ method is called each time the constructor is called. For example: >>> class MySingleton(Singleton): ... def init(self): ... print "calling init" ... def __init__(self): ... print "calling __init__" ... >>> x = MySingleton() calling init calling __init__ >>> assert x.__class__ is MySingleton >>> y = MySingleton() calling __init...

• Unifying types and classes in Python 2.2

  ...instance, subclasses should override 'init' instead of __init__ - the __init__ method is called each time the constructor is called. For example: >>> class MySingleton(Singleton): ... def init(self): ... print "calling init" ... def __init__(self): ... print "calling __init__" ... >>> x = MySingleton() calling init calling __init__ >>> assert x.__class__ is MySingleton >>> y = MySingleton() calling __init...

• Unifying types and classes in Python 2.2

  ...initialize the subclass instance, subclasses should override 'init' instead of __init__ - the __init__ method is called each time the constructor is called. For example: >>> class MySingleton(Singleton): ... def init(self): ... print "calling init" ... def __init__(self): ... print "calling __init__" ... >>> x = MySingleton() calling init calling __init__ >>> assert x.__class__ is MySingleton >>> y = MySingleton() calling __init__ >>> assert x is y >...

• PSF Contributor Agreement

  ...in the eSign box below. Next, electronically sign it by clicking the button in the signature box and following the instructions. Finally, click the "eSign" button to have the form sent to the PSF Secretary. Then check your email for an automated verification email that you will need to respond to before your Agreement can be processed. If you'd rather print and fill out the form, please use the PDF version. Please print a copy of the PDF, fill out your name, address, and initi...

• Foreword for "Programming Python" (2nd ed.)

  ...in a backwards compatible way. The current plan, however, is that the necessary changes will be introduced gradually into the current Python 2.x line of development, with a clear transition path that includes a period of backwards compatibility support. Take for example integer division. In line with C, Python currently defines x/y with two integer arguments to have an integer result. In other words, 1/2 yields 0! While most died-in-the-wool programmers expect this, it's a continuin...

• Appointment of Proxy for February 24, 2006 member meeting in Dallas, TX

  ...ing organizations have been nominated as sponsor members of the PSF. NomineeVote yes to accept as new member CCP Games yes no abstain [ circle one ] Election of Nominated Members The following people have been nominated as nominated members of the PSF. NomineeVote yes to accept as new member Georg Brandl yes no abstain Paul Everitt yes no abstain Jim Hugunin yes no abstain Travis Oliphant yes no abstain Anna Martelli Ra...

• Python 2.0

  ...indows, the interpreter wrote .pyc files in text mode, rendering them useless. They are now written in binary mode again. Standard library Keyword arguments are now accepted for most pattern and match object methods in SRE, the standard regular expression engine. In SRE, fixed error with negative lookahead and lookbehind that manifested itself as a runtime error in patterns like "(?<!abc)(def)". Several bugs in the Unicode handling and error handling in _tkinter ...

• Metaclasses in Python 1.5

  ...instance variables. The __call__ method is invoked when a Tracing instance is called, e.g. the creation of aninstance later in the example. It returns an instance of the class Instance, which is defined next. The class Instance is the class used for all instances of classes built using the Tracing metaclass, e.g. aninstance. It has two methods: The __init__ method is invoked from the Tracing.__call__ method above to initialize a new instance. It saves the class refer...

• 2013-03-29 PSF Board Meeting Minutes

  ...ing Management Worked on getting contracts for additional rooms so we can accommodate all people who were waiting for housing. PyCon Internet Finalized the internet needs for 2013. Working with SmartCity on this. PyCon Printing Assisted with program printing towards the end. Gathered printing for tutorial handouts and coordinated with JP Graphics. Gathering printing for open space cards. Worked on all meter boards and schedules including editing. Had all signage organized for prin...

• What's new in Python 1.5 and beyond

  ...In most situations, the interpreter can be installed at an arbitrary location without having to recompile. The build process now builds a single library (libpython1.5.a) which contains everything except for the main() entry point. This makes life much easier for applications that embed Python. There is much better support for embedding, including threads, multiple interpreters(!), uninitialization, and access to the global interpreter lock. There is a -O option that removes SET_LINENO instructi...

• Parade of the PEPs

  ...in a previous comment. Here are my current comments: New builtin: indexed() I like the idea of having some way to iterate over a sequence and its index set in parallel. It's fine for this to be a builtin. I don't like the name "indexed"; adjectives do not make good function names. Maybe iterindexed()? I don't like the start and stop arguments. If I saw code like for i, j in iterindexed("abcdefghij", 5, 10): print i, j I would expect it to print...

• Release – Python 3.8.16

  Version: None

  Released: Dec. 6, 2022

  This is a security release of Python 3.8 Note: The release you're looking at is Python 3.8.16, a security bugfix release for the legacy 3.8 series. Python 3.11 is now the latest feature release series of Python 3. Get the latest release of 3.11.x here. Security content in this …

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• Release – Python 3.7.16

  Version: None

  Released: Dec. 6, 2022

  This is a security release of Python 3.7 Note: The release you are looking at is a security bugfix release for the legacy 3.7 series which has now reached end-of-life and is no longer supported. See the downloads page for currently supported versions of Python. The final security bugfix release …

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• Slideshow Collections for Instructional Use

  ...Instructional Use We are collecting and making available slideshows for reading at your own pace and reuse in your presentations. The preferred format is reStructuredText/S5 since it can be easily edited without special software and converted into various delivery formats. Where possible, speaker notes are included to give the slides meaning without an audio overlay. Preparing for Screencasting Advice on how to get started giving screencasts, why you might want to do it and how to establis...

• Appointment of Proxy for July 24, 2002 member meeting in San Diego, CA

  ...intment of Proxy for July 24, 2002 member meeting in San Diego, CA <h3>Appointment of Proxy for July 24, 2002 member meeting in San Diego, CA</h3> <p><b>Proxy</b> <p>As a member of the Python Software Foundation (PSF), I hereby appoint: <br>______________________________________________________________ <br>[Print the name of the person you are appointing as your proxy.] <br>as my proxy with full power to vote in accordance with the directio...

• Python Patterns - An Optimization Anecdote

  ...ing concatenation functions in the string module that are implemented in C. In particular, string.joinfields(list_of_strings, delimiter) concatenates a list of strings, placing a delimiter of choice between each two strings. Nothing stops us from concatenating a list of characters (which are just strings of length one in Python), using the empty string as delimiter. Lo and behold: import string def f6(list): return string.joinfields(map(chr, list), "") Th...

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