Notice: While JavaScript is not essential for this website, your interaction with the content will be limited. Please turn JavaScript on for the full experience.
...eval hack: @eval("buttons[1].clicked.connect") def eggs(): ... Rationale Allowing Any Expression The decision to allow any valid expression (and not just relaxing the current restrictions to allow, for example, subscripting) has been considered as the next logical step in the evolution of decorator grammar for quite some time. As Guido noted, during yet another mailing list thread: I don't think it's reasonable to constrain it less than it currently is but more than a general expressi...
...eval, but only to eval a literal. As described here (a string prefix rather than an operator), it introduces no new security issues since the expressions to be evaluated must be literally present in the code. Implementation The Itpl module at [1] provides a prototype of this feature. It uses the tokenize module to find the end of an expression to be interpolated, then calls eval() on the expression each time a value is needed. In the prototype, the expression is parsed and compiled again ea...
...evaluated at module-level scope. Annotations under PEP 563 can no longer refer to * class variables, * local variables in the current function, or * local variables in enclosing functions. It requires a code change every time existing code uses an annotation, to handle converting the stringized annotation back into a useful value. eval() is slow. eval() isn't always available; it's sometimes removed from Python for space reasons. In order to evaluate the annotations on a class, it requires obta...
...Eval_GetLocals() C API and by directly accessing the internal storage of a frame object. Fast locals proxy objects and the internal frame value cache returned by PyEval_GetLocals() offer the following behavioural guarantees: changes made via a fast locals proxy will be immediately visible to the frame itself, to other fast locals proxy objects for the same frame, and in the internal value cache stored on the frame (it is this last point that provides PyEval_GetLocals() interoperability) changes...
...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...
...eval() and exec? What about code compiled by the codeop module? Will there be conversion tools or aids? Why is my question not answered here? Implementation Copyright Abstract The current division (/) operator has an ambiguous meaning for numerical arguments: it returns the floor of the mathematical result of division if the arguments are ints or longs, but it returns a reasonable approximation of the division result if the arguments are floats or complex. This makes expressions expecting ...
...eval and free variables: It might be useful if there was a way to pass bindings for free variables to eval when a code object with free variables is passed. https://bugs.python.org/issue443866 Standard Library The urllib module should support proxies which require authentication. See SourceForge bug #210619 for information: https://bugs.python.org/issue210619 os.rename() should be modified to handle EXDEV errors on platforms that don't allow rename() to operate across filesystem boundarie...
...eval() or exec. In a Python with universal newline support open() the mode parameter can also be "U", meaning "open for input as a text file with universal newline interpretation". Mode "rU" is also allowed, for symmetry with "rb". Mode "U" cannot be combined with other mode flags such as "+". Any line ending in the input file will be seen as a '\n' in Python, so little other code has to change to handle universal newlines. Conversion of newlines happens in all calls that read data: read(), rea...
...evaluates expressions back from its string form. Note that all valid code currently using __annotations__ should already be doing that since a type annotation can be expressed as a string literal. For code which uses annotations for other purposes, a regular eval(ann, globals, locals) call is enough to resolve the annotation. In both cases it's important to consider how globals and locals affect the postponed evaluation. An annotation is no longer evaluated at the time of definition and, more ...
...eval('010') == 8 should no longer be true, because that is confusing to new users. It was also proposed that: eval('0010') == 10 should become true, but that is much more contentious, because it is so inconsistent with usage in other computer languages that mistakes are likely to be made. Almost all currently popular computer languages, including C/C++, Java, Perl, and JavaScript, treat a sequence of digits with a leading zero as an octal number. Proponents of treating these numbers as decim...
...Evaluation of Annotations) is enough to accept this proposition, if we accept to not be compatible with the dynamic evaluation of annotations (eval()). >>> from __future__ import annotations >>> def foo() -> int | str: pass ... >>> eval(foo.__annotations__['return']) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<string>", line 1, in <module> TypeError: unsupported operand type(s) for |: 'type' and 'type' ...
...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...
...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...
...eval(input()) and raw_input() with input(). Naming Discussion With input() effectively removed from the language, the name raw_input() makes much less sense and alternatives should be considered. The various possibilities mentioned in various forums include: ask() ask_user() get_string() input() # initially rejected by BDFL, later accepted prompt() read() user_input() get_response() While it was initially rejected by the BDFL, it has been suggested that the most direct solution would be to...
...eval() function. The input() function. Since a module M containing a future_statement naming feature F explicitly requests that the current release act like a future release with respect to F, any code compiled dynamically from text passed to one of these from within M should probably also use the new syntax or semantics associated with F. The 2.1 release does behave this way. This isn't always desired, though. For example, doctest.testmod(M) compiles examples taken from strings in M, and tho...
...eval: def except_(expression, exception_list, default): try: return eval(expression, globals_of_caller(), locals_of_caller()) except exception_list as exc: l = locals_of_caller().copy() l['exc'] = exc return eval(default, globals_of_caller(), l) def globals_of_caller(): return sys._getframe(2).f_globals def locals_of_caller(): return sys._getframe(2).f_locals value = except_("""1/x""",ZeroDivisionError,""" "Can't divide by zero" """) which is ...
...eval, PyAst_CompileString, PyAST_obj2mod compile (code, filename_or_none) Detect dynamic code compilation, where code could be a string or AST. Note that this will be called for regular imports of source code, including those that were opened with open_code. exec, eval, run_mod exec (code_object,) Detect dynamic execution of code objects. This only occurs for explicit calls, and is not raised for normal function invocation. import import (module, filename, sys.path, sys.meta_path, sys.path_hoo...
...eval(repr(float('inf'))) roundtrip is still not supported unless you define inf and nan yourself: >>> inf = float('inf') >>> inf, 1E400 (inf, inf) >>> neginf = float('-inf') >>> neginf, -1E400 (-inf, -inf) >>> nan = float('nan') >>> nan, inf * 0. (nan, nan) The math and the sys module also have gained additional features, sys.float_info, math.isinf, math.isnan, math.copysign. Abstract This PEP proposes an API and a provides a reference mo...
...Eval_EvalFrameEx() currently is (called _PyEval_EvalFrameDefault(), discussed later in this PEP). Third-party code may then set their own frame evaluation function instead to control the execution of Python code. A pointer comparison can be used to detect if the field is set to _PyEval_EvalFrameDefault() and thus has not been mutated yet. Changes to Python/ceval.c PyEval_EvalFrameEx() [5] as it currently stands will be renamed to _PyEval_EvalFrameDefault(). The new PyEval_EvalFrameEx() will th...