These are properties defined by the specific browser and are not defined by ECMAScript. Therefore, name collision needs to be avoided. If they called the property defineGetter, then there would be no guarantee that the website’s code didn’t already define a property by that same name — and that would cause many problems. However, appending … Read more
In C, symbols starting with an underscore followed by either an upper-case letter or another underscore are reserved for the implementation. You as a user of C should not create any symbols that start with the reserved sequences. In C++, the restriction is more stringent; you the user may not create a symbol containing a … Read more
Please note that there is no such thing as “private method” in Python. Double underscore is just name mangling: >>> class A(object): … def __foo(self): … pass … >>> a = A() >>> A.__dict__.keys() [‘__dict__’, ‘_A__foo’, ‘__module__’, ‘__weakref__’, ‘__doc__’] >>> a._A__foo() So therefore __ prefix is useful when you need the mangling to occur, for … Read more
From the Python PEP 8 — Style Guide for Python Code: Descriptive: Naming Styles The following special forms using leading or trailing underscores are recognized (these can generally be combined with any case convention): _single_leading_underscore: weak “internal use” indicator. E.g. from M import * does not import objects whose name starts with an underscore. single_trailing_underscore_: … Read more