K-Dawg wrote:
I do no understand the underscore methods.
Names of the form __xyx__ are defined by the language definition and
recognized and used by the interpreter.
See PythonLanguage / LexicalAnalysis / Identifiers / Reserved
Most refer to methods, a few to other attributes. Modules may have
several non-method attributes, such as '__builtins__', '__doc__',
'__file__', '__name__', and '__package__'.
The top-level module created when the interpreter starts is given the
name '__main__'. If a module is imported, it __name__ is the import name.
>>> __name__
'__main__'
>>> import email
>>> email.__name__
'email'
>>> email.__file__
'C:\\Programs\\Python30\\lib\\email\\__init__.py'
If email were run directly, its name would be __main__ while the
__file__ would be the same.
Most syntax operations have a corresponding special that implements the
operation. This allows user-defined objects to fully participate in
syntax operations on an equal basis with built-in objects.
See PythonLanguage Manual / Data model / Special operations.
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