What is the right way to treat argparse Namespace as a dictionary

Question

If I want to use the results of argparse ArgumentParser    which is a Namespace object  with a method that expects a dictionary or mapping-like object  see collections Mapping   what is the right way to do it   C   gt python Python 2 7 3  default  Apr 10 2012  23 31 26   MSC v 1500 32 bit  Intel   on win 32 Type  help    copyright    credits  or  license  for more information   gt  gt  gt  import argparse  gt  gt  gt  args   argparse Namespace    gt  gt  gt  args foo   1  gt  gt  gt  args bar    1 2 3   gt  gt  gt  args baz    yippee   gt  gt  gt  args  baz   Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  TypeError   Namespace  object has no attribute    getitem     gt  gt  gt  dir args      class        contains        delattr        dict        doc        eq         format        getattribute        hash        init        module        ne        new        reduce        reduce ex        repr        setattr        sizeof         str        subclasshook        weakref       get args     get kwargs    ba r    baz    foo     Is it proper to  reach into  an object and use its   dict   property   I would think the answer is no    dict   smells like a convention for implementation  but not for an interface  the way   getattribute   or   setattr   or   contains   seem to be

User · Answer

Is it proper to  reach into  an object and use its dict property    In general  I would say  no   However Namespace has struck me as over-engineered  possibly from when classes couldn t inherit from built-in types    On the other hand  Namespace does present a task-oriented approach to argparse  and I can t think of a situation that would call for grabbing the   dict    but the limits of my imagination are not the same as yours

User · Answer

You can access the namespace s dictionary with vars      gt  gt  gt  import argparse  gt  gt  gt  args   argparse Namespace    gt  gt  gt  args foo   1  gt  gt  gt  args bar    1 2 3   gt  gt  gt  d   vars args   gt  gt  gt  d   foo   1   bar    1  2  3     You can modify the dictionary directly if you wish    gt  gt  gt  d  baz      store me   gt  gt  gt  args baz  store me    Yes  it is okay to access the   dict   attribute   It is a well-defined  tested  and guaranteed behavior

User · Answer

Straight from the horse s mouth   If you prefer to have dict-like view of the attributes  you can use the standard Python idiom  vars     gt  gt  gt  parser   argparse ArgumentParser    gt  gt  gt  parser add argument  --foo    gt  gt  gt  args   parser parse args   --foo    BAR     gt  gt  gt  vars args    foo    BAR        The Python Standard Library  16 4 4 6  The Namespace object

[python] What is the right way to treat argparse.Namespace() as a dictionary?

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