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  • Comparing Python to Other Languages

    ...variable, it seems a waste of time to consider them much for this comparison. Java Python programs are generally expected to run slower than Java programs, but they also take much less time to develop. Python programs are typically 3-5 times shorter than equivalent Java programs. This difference can be attributed to Python's built-in high-level data types and its dynamic typing. For example, a Python programmer wastes no time declaring the types of arguments or variables, and Python...

  • Unifying types and classes in Python 2.2

    ...variable defined by __slots__; the __slots__ declaration creates a class attribute for each variable containing a descriptor, and setting a class attribute to a default value would overwrite this descriptor. There's no check that prevents you to override an instance variable already defined by a base class using a __slots__ declaration. If you do that, the instance variable defined by the base class is inaccessible (except by retrieving its descriptor directly from the base class; thi...

  • Python Software Foundation Board Meeting Minutes 2006-02-25

    Python Software Foundation Board Meeting Minutes 2006-02-25 The Python Software Foundation Minutes of a Special Meeting of the Board of Directors February 25, 2006 A special meeting of the Python Software Foundation ("PSF") Board of Directors was held at PyCon in Dallas at 12:15 CST (18:15 UTC), 25 February 2006. Stephan Deibel presided at the meeting. 1   Attendance The following members of the Board of Directors were present at the meeting: Stephan Deibel, Mart...

  • Unifying types and classes in Python 2.2

    ...variable doubles the memory used by a defaultdict instance compared to using a regular dictionary! There's a way to avoid this: class defaultdict2(dict): __slots__ = ['default'] def __init__(self, default=None): ...(like before)... The __slots__ declaration takes a list of instance variables, and reserves space in the instance for exactly these in the instance. When __slots__ is used, other instance variables cannot be assigned to: >>> a...

  • Unifying types and classes in Python 2.2

    ...variable doubles the memory used by a defaultdict instance compared to using a regular dictionary! There's a way to avoid this: class defaultdict2(dict): __slots__ = ['default'] def __init__(self, default=None): ...(like before)... The __slots__ declaration takes a list of instance variables, and reserves space in the instance for exactly these in the instance. When __slots__ is used, other instance variables cannot be assigned to: >>> a...

  • Unifying types and classes in Python 2.2

    ...variable doubles the memory used by a defaultdict instance compared to using a regular dictionary! There's a way to avoid this: class defaultdict2(dict): __slots__ = ['default'] def __init__(self, default=None): ...(like before)... The __slots__ declaration takes a list of instance variables, and reserves space in the instance for exactly these in the instance. When __slots__ is used, other instance variables cannot be assigned to: >>> a = defaultdict2(defa...

  • Built-in Package Support in Python 1.5

    ...variable (which gives the full name of the module or package). The __path__ Variable The one distinction between packages and modules lies in the presence or absence of the variable __path__. This is only present for packages. It is initialized to a list of one item, containing the directory name of the package (a subdirectory of a directory on sys.path). Changing __path__ changes the list of directories that are searched for submodules of the package. For example, the Sound.Eff...

  • Towards a Standard Parser Generator

    ...VARIABLE TYPE="PyObject*" NAME="right"></VARIABLE> <VARIABLE TYPE="PyObject*" NAME="left"></VARIABLE> <VARIABLE TYPE="PyObject*" NAME="expr"></VARIABLE> <CODE_SNIPPET> right = stack_pop(); left = stack_pop(); expr = PyObject_CallMethod(ParsedExpr, "ParsedUnionExpr", "OO", left, right); decref(right); decref(left); stack_push(expr); </CODE_SNIPPET> ...

  • Notes

    ...variables in the outer scope, which makes it impossible to determine the bindings for free variables in the inner scope. To avoid the warning about import *, change it into an import of explicitly name object, or move the import* statement to the global scope; to avoid the warning about bare exec, use exec...in... (a good idea anyway -- there's a possibility that bare exec will be deprecated in the future). Use of a global variable in a nested scope with the same name as a local variable in a s...

  • Python Success Stories

    ...variables or types, create iterators and other support objects, break code into particular files, or write other supporting code required in languages like C++ or Java. As a result, Python is almost executable pseudo-code. Python speeds the development cycle. Since Python code is compiled to byte code on the fly by the interpreter, the development cycle is just "edit-and-execute" instead of "edit-compile-execute". In practice, this can save substantial amounts of time. Pytho...

  • What's new in Python 2.3

    ...variable wrappers now also pass objects directly to Tcl, instead of converting them to strings. trace - a tool for tracing program execution and reporting code coverage textwrap - simple but effective text paragraph wrapping, by Greg Ward. zipimport - import modules from zipfiles, implemented in C by Just van Rossum based upon earlier code by James Ahlstrom. (New in 2.3a2: several serious bugs discovered in 2.3a1 fixed.) General PYTHONINSPECT - A program can now set the environment vari...

  • Notes

    ...variable, has_ipv6, which is True iff the current Python has IPv6 support. See SF patch #658327. Tkinter wrappers around Tcl variables now pass objects directly to Tcl, instead of first converting them to strings. The .*? pattern in the re module is now special-cased to avoid the recursion limit. (SF patch #720991 -- many thanks to Gary Herron and Greg Chapman.) New function sys.call_tracing() allows pdb to debug code recursively. New function gc.get_referents(obj) returns a list of objects di...

  • Computer Programming for Everybody

    ...variable expansion. (The fact that such features have been added as extensions to HTML proves the point.) Procedural languages, on the other hand, usually aren't as good in any particular domain (e.g. it takes a lot more work to write a program in a procedural language to format a paragraph of text than it does in HTML). However, they make up for this through their Turing-completeness, which makes it possible to solve any problem that might come up (assuming availability of sufficient...

  • Python 2.4.1 - Release Notes

    ...variable, has_ipv6, which is True iff the current Python has IPv6 support. See SF patch #658327. Tkinter wrappers around Tcl variables now pass objects directly to Tcl, instead of first converting them to strings. The .*? pattern in the re module is now special-cased to avoid the recursion limit. (SF patch #720991 -- many thanks to Gary Herron and Greg Chapman.) New function sys.call_tracing() allows pdb to debug code recursively. New function gc.get_referents(obj) returns a list of objects di...

  • Notes

    ...variable LDSHARED, if it is set. Added Peter Astrand's subprocess.py module. See PEP 324 for details. time.strptime() now properly escapes timezones and all other locale-specific strings for regex-specific symbols. Was breaking under Japanese Windows when the timezone was specified as "Tokyo (standard time)". Closes bug #1039270. Updates for the email package: email.Utils.formatdate() grew a 'usegmt' argument for HTTP support. All deprecated APIs that in email 2.x issued warnings hav...

  • What's New In Python 3.0

    ...variables would grow without limit. Issue #3643: Added a few more checks to _testcapi to prevent segfaults by exploitation of poor argument checking. bsddb code updated to version 4.7.3pre2. This code is the same than Python 2.6 one, since the intention is to keep an unified 2.x/3.x codebase. The Python code is automatically translated using "2to3". Please, do not update this code in Python 3.0 by hand. Update the 2.6 one and then do "2to3". The _bytesio and _stringio modules...

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