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  • Python Success Stories

    ...eval" statement to parse and evaluate the user-defined expressions. Because our Property manager acts like a Python dictionary, it could (at least in theory) be provided directly to the eval statement as the locals dictionary used for variable lookup during expression evaluation. As it turned out, for performance reasons, the eval() implementation in Python accepts only built-in dictionary types and not an emulated mapping type, so we had to engage in some extra trickery to make our on-dema...

  • Highlights: Python 2.4

    ...eval() now accepts any form of object that acts as a mapping as its argument for locals, rather than only accepting a dictionary. There's all sorts of new and shiny evil possible thanks to this little change. New or upgraded modules and packages a new subprocess module for spawning processes in a platform-independent way (see PEP 324) decimal - a new numeric type that allows for the accurate representation of floating point numbers (avoiding the problems of binary floating point) (PEP 327) o...

  • Donation Drive

    ...eval('jsondata' + cpid); var crmCurrency = jsonvar.currencySymbol; document.getElementById('crm_cpid_'+cpid+'_title').innerHTML = jsonvar.title; if ( jsonvar.money_target > 0 ) { document.getElementById('crm_cpid_'+cpid+'_amt_hi').innerHTML = jsonvar.money_target_display; document.getElementById('crm_cpid_'+cpid+'_amt_low').innerHTML = crmCurrency+jsonvar.money_low; } document.getElementById('crm_cpid_'+cpid+'_amt_raised').innerHTML = jsonva...

  • Donation Drive

    ...eval('jsondata' + cpid); var crmCurrency = jsonvar.currencySymbol; document.getElementById('crm_cpid_'+cpid+'_title').innerHTML = jsonvar.title; if ( jsonvar.money_target > 0 ) { document.getElementById('crm_cpid_'+cpid+'_amt_hi').innerHTML = jsonvar.money_target_display; document.getElementById('crm_cpid_'+cpid+'_amt_low').innerHTML = crmCurrency+jsonvar.money_low; } document.getElementById('crm_cpid_'+cpid+'_amt_raised').innerHTML = jsonva...

  • Building the PSF: the Q2 2019 Fundraiser

    Building the PSF: the Q2 2019 Fundraiser Help us raise $60,000 USD by June 30th! #countdown-wrap { width: 70%; padding: 10px; font-family: arial; max-width: 650px; margin: 10px auto 50px; } #goal { font-size: 36px; text-align: center; color: #888; @media only screen and (max-width : 640px) { text-align: center; } } #glass { width: 100%; height: 20px; background: #c7c7c7; border-radius: 10px; float: left; overflow: hidden; } #progress { float: left;...

  • What's new in Python 2.3

    ...eval(), exec - fully support Unicode, and no longer issue a SyntaxError when their input doesn't end with a newline. (New in 2.3a2.) range() - as of 2.3b1 supports long arguments with a magnitude larger than sys.maxint. E.g., range(2**100, 2**101, 2**100) is the following list: [1267650600228229401496703205376L]. dict() - two new features for dict construction: keyword arguments to the dict() constructor are now a shorthand for creating a dictionary from the key/value pairs, and dict.fromkey...

  • Python 2.0

    ...evaluated only once (relevant when A is something like dict[index].attr). However, if A is a mutable object, A may be modified in place. Thus, if A is a number or a string, A += B has the same effect as A = A+B (except A is only evaluated once); but if a is a list, A += B has the same effect as A.extend(B)! Classes and built-in object types can override the new operators in order to implement the in-place behavior; the not-in-place behavior is used automatically as a fallback when a...

  • Python Success Stories

    ...evaluated first. This provides us with the basic spreadsheet model that has proven so valuable for ad-hoc investigation of numerical models. Figure 2. The basic steps Resolver One uses to evaluate cell formulae. Zoom in However, using this method, it is difficult for users to create spreadsheets of any complexity without using cell expressions that are enormous and unwieldy, mixing data, business logic and presentation information. These expressions get duplicated (and almost-duplicated) many...

  • Computer Programming for Everybody

    ...Evaluate the feedback and recommend guidelines for follow-up research or development. As soon as an initial version of the development environment and training material is released to the Python community, the feedback channels will be opened, and the initial feedback will mostly go into improvements of the environment and materials. Later, when more feedback has come in, we will evaluate the use of Python for this project. Maybe Python is perfect; quite possibly changes are nec...

  • Notes

    ...eval.c. This bug could cause python to crash. It was related to using a 'continue' inside a 'try' block. SF bug #422004: Py_Initialise fix that allows reload(exceptions) to work - this is apparently very important for embedded python working with multiple interpreters. SF patch #500401: webbrowser: tightened up the command passed to os.system() so that arbitrary shell code can't be executed because a bogus URL was passed in. The Python compiler package was updated to correctly calculate stack de...

  • Unifying types and classes in Python 2.2

    ...eval(): >>> print a.keys() [1, 2] >>> exec "x = 3; print x" in a 3 >>> print a.keys() ['__builtins__', 1, 2, 'x'] >>> print a['x'] 3 >>> However, our __getitem__() method is not used for variable access by the interpreter: >>> exec "print foo" in a Traceback (most recent call last): File "<stdin>", line 1, in ? File "<string>", line 1, in ? NameError: name 'foo' is not defined >>> Why doesn'...

  • Unifying types and classes in Python 2.2

    ...eval(): >>> print a.keys() [1, 2] >>> exec "x = 3; print x" in a 3 >>> print a.keys() ['__builtins__', 1, 2, 'x'] >>> print a['x'] 3 >>> However, our __getitem__() method is not used for variable access by the interpreter: >>> exec "print foo" in a Traceback (most recent call last): File "<stdin>", line 1, in ? File "<string>", line 1, in ? NameError: name 'foo' is not defined >>> Why doesn'...

  • Unifying types and classes in Python 2.2

    ...eval(): >>> print a.keys() [1, 2] >>> exec "x = 3; print x" in a 3 >>> print a.keys() ['__builtins__', 1, 2, 'x'] >>> print a['x'] 3 >>> However, our __getitem__() method is not used for variable access by the interpreter: >>> exec "print foo" in a Traceback (most recent call last): File "<stdin>", line 1, in ? File "<string>", line 1, in ? NameError: name 'foo' is not defined >>> Why doesn'...

  • Unifying types and classes in Python 2.2

    ...eval(): >>> print a.keys() [1, 2] >>> exec "x = 3; print x" in a 3 >>> print a.keys() ['__builtins__', 1, 2, 'x'] >>> print a['x'] 3 >>> However, our __getitem__() method is not used for variable access by the interpreter: >>> exec "print foo" in a Traceback (most recent call last): File "<stdin>", line 1, in ? File "<string>", line 1, in ? NameError: name 'foo' is not defined >>> Why doesn't this print 0.0? The interpreter uses an internal functio...

  • Notes

    ...Eval_EvalFrame() "periodic" code when things_to_do is not cleared by Py_MakePendingCalls(). What's New in Python 2.4 (release candidate 1) Release date: 18-NOV-2004 Core and builtins Bug 1061968: Fixes in 2.4a3 to address thread bug 1010677 reintroduced the years-old thread shutdown race bug 225673. Numeric history lesson aside, all bugs in all three reports are fixed now. Library Bug 1052242: If exceptions are raised by an atexit handler function an attempt is made to exec...

  • Computer Programming for Everybody

    ...evaluate Python and propose improvements or alternatives. Rationale CNRI proposes to undertake a research effort called Computer Programming for Everybody (CP4E). This effort intends to improve the state of the art of computer use, not by introducing new hardware, nor even (primarily) through new software, but simply by empowering all users to be computer programmers. Recent developments in computer and communication hardware have given many people access to powerful computers, in the fo...

  • Python 2.4.1 - Release Notes

    ...evaluation order of dictionary literals to conform to the general left to right evaluation order rule. Now {f1(): f2()} will evaluate f1 first. Fixed bug #521782: when a file was in non-blocking mode, file.read() could silently lose data or wrongly throw an unknown error. The sq_repeat, sq_inplace_repeat, sq_concat and sq_inplace_concat slots are now always tried after trying the corresponding nb_* slots. This fixes a number of minor bugs (see bug #624807). Fix problem with dynamic loading on...

  • Notes

    ...evaluation order of dictionary literals to conform to the general left to right evaluation order rule. Now {f1(): f2()} will evaluate f1 first. Fixed bug #521782: when a file was in non-blocking mode, file.read() could silently lose data or wrongly throw an unknown error. The sq_repeat, sq_inplace_repeat, sq_concat and sq_inplace_concat slots are now always tried after trying the corresponding nb_* slots. This fixes a number of minor bugs (see bug #624807). Fix problem with dynamic loading on...

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