3-17 Function - namespace

Namespaces

Also known name space, by definition is a place to store name, store name? Illustration, if the variable x = 1,1 stored in memory, that name x Where is it stored? It is a place to store the namespace binding relationship with x.

A total of three kinds of name space, are as follows:

• locals: name space within the function, including local variables and parameter
• globals: global variables, function module was defined namespace
• builtins: namespace built-in module

Scope of different variables is different from the namespace where the decision of this variable.

Scope That range:

• Global scope: global survival, globally effective
• Local scope: Temporary survival, local effective

View Scope Methods: globals () locals ()

>>> x = 1
>>> globals()
{'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <cl
ass '_frozen_importlib.BuiltinImporter'>, '__spec__': None, '__annotations__': {
}, '__builtins__': <module 'builtins' (built-in)>, 'x': 1}

>>> locals() #现在所在的位置命名空间中的内容
{'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <cl
ass '_frozen_importlib.BuiltinImporter'>, '__spec__': None, '__annotations__': {
}, '__builtins__': <module 'builtins' (built-in)>, 'x': 1}
>>> __builtins__
<module 'builtins' (built-in)>
>>> dir(__builtins__)
['ArithmeticError', 'AssertionError', 'AttributeError', 'BaseException', 'Blocki
ngIOError', 'BrokenPipeError', 'BufferError', 'BytesWarning', 'ChildProcessError
', 'ConnectionAbortedError', 'ConnectionError', 'ConnectionRefusedError', 'Conne
ctionResetError', 'DeprecationWarning', 'EOFError', 'Ellipsis', 'EnvironmentErro
r', 'Exception', 'False', 'FileExistsError', 'FileNotFoundError', 'FloatingPoint
Error', 'FutureWarning', 'GeneratorExit', 'IOError', 'ImportError', 'ImportWarni