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• Metaclasses in Python 1.5

  ...namespace is a dictionary containing the local variables collected during execution of the class statement. Note that the contents of the namespace dictionary is simply whatever names were defined in the class statement. A little-known fact is that when Python executes a class statement, it enters a new local namespace, and all assignments and function definitions take place in this namespace. Thus, after executing the following class statement: class C: a = 1 def f(s):...

• Comparing Python to Other Languages

  ...definitions. However, for JavaScript, that's all there is. Python, on the other hand, supports writing much larger programs and better code reuse through a true object-oriented programming style, where classes and inheritance play an important role. Perl Python and Perl come from a similar background (Unix scripting, which both have long outgrown), and sport many similar features, but have a different philosophy. Perl emphasizes support for common application-oriented tasks, e.g. by...

• Notes

  ...definition in the nearest enclosing function scope will be used. One consequence of this change is that lambda statements could reference variables in the namespaces where the lambda is defined. In some unusual cases, this change will break code. In all previous version of Python, names were resolved in exactly three namespaces -- the local namespace, the global namespace, and the builtin namespace. According to this old definition, if a function A is defined within a function B, the names bo...

• Parade of the PEPs

  ...Namespaces - Hylton PEP 280 - Optimizing access to globals - van Rossum These three should be considered together; at most one of them can be implemented (or maybe a hybrid). I would like one of them to be implemented eventually, because I think it may have a big performance benefit: not only avoiding dict lookups for globals and builtins, but also recognizing certain builtins in the parser and generating code that knows what the built-in does, like an opcode for len(x) and special co...

• Python Humor

  ...Namespaces are one honking great idea -- let's do more of those! —Tim Peters (This classic is also available in the Python interactive interpreter, just import this!) Fundamental... Subject: Re: Book review review From: "Chyden.Net" <@chyden.net> Date: Fri, 17 Apr 1998 12:53:48 +0100 Newsgroups: comp.lang.python Mark Lutz wrote: > Naturally, not everyone has the same sense of humor. Dear, gentle, Mr. Lutz: Not everyone has *ANY* sense of humor. I -- an econo...

Python language documentation

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