Add get_default method.

6 files changed, 59 insertions, 3 deletions

diff --git a/argparse.py b/argparse.py
index bd03f29..f29b6e0 100644
--- a/argparse.py
+++ b/argparse.py
@@ -1238,7 +1238,7 @@ class _ActionsContainer(object):
         return self._registries[registry_name].get(value, default)
 
     # ==================================
-    # Namespace default settings methods
+    # Namespace default accessor methods
     # ==================================
     def set_defaults(self, **kwargs):
         self._defaults.update(kwargs)
@@ -1249,6 +1249,12 @@ class _ActionsContainer(object):
             if action.dest in kwargs:
                 action.default = kwargs[action.dest]
 
+    def get_default(self, dest):
+        for action in self._actions:
+            if action.dest == dest and action.default is not None:
+                return action.default
+        return self._defaults.get(dest, None)
+
     # =======================
     # Adding argument actions
     # =======================
diff --git a/doc/genindex.html b/doc/genindex.html
index c6ceffd..238b203 100644
--- a/doc/genindex.html
+++ b/doc/genindex.html
@@ -40,7 +40,7 @@
 
    <h1 id="index">Index</h1>
 
-   <a href="#A"><strong>A</strong></a> | <a href="#F"><strong>F</strong></a> | <a href="#P"><strong>P</strong></a> | <a href="#S"><strong>S</strong></a> 
+   <a href="#A"><strong>A</strong></a> | <a href="#F"><strong>F</strong></a> | <a href="#G"><strong>G</strong></a> | <a href="#P"><strong>P</strong></a> | <a href="#S"><strong>S</strong></a> 
 
    <hr />
 
@@ -63,6 +63,13 @@
 <dt><a href="other-utilities.html#FileType">FileType (built-in class)</a></dt></dl></td><td width="33%" valign="top"><dl>
 </dl></td></tr></table>
 
+<h2 id="G">G</h2>
+<table width="100%" class="indextable"><tr><td width="33%" valign="top">
+<dl>
+
+<dt><a href="other-methods.html#get_default">get_default()</a></dt></dl></td><td width="33%" valign="top"><dl>
+</dl></td></tr></table>
+
 <h2 id="P">P</h2>
 <table width="100%" class="indextable"><tr><td width="33%" valign="top">
 <dl>
diff --git a/doc/other-methods.html b/doc/other-methods.html
index 69e870e..2b33b0d 100644
--- a/doc/other-methods.html
+++ b/doc/other-methods.html
@@ -117,6 +117,18 @@ Instead, it returns a two item tuple containing the populated namespace and the
 <p>Parser-level defaults can be particularly useful when you&#8217;re working with multiple parsers.  See the <a title="add_subparsers" class="reference internal" href="#add_subparsers"><tt class="xref docutils literal"><span class="pre">add_subparsers()</span></tt></a> method for an example of this type.</p>
 </dd></dl>
 
+<dl class="method">
+<dt id="get_default">
+<tt class="descname">get_default</tt><big>(</big><em>dest</em><big>)</big><a class="headerlink" href="#get_default" title="Permalink to this definition">¶</a></dt>
+<dd><p>Get the default value for a namespace attribute, as set by either <a title="add_argument" class="reference external" href="add_argument.html#add_argument"><tt class="xref docutils literal"><span class="pre">add_argument()</span></tt></a> or by <a title="set_defaults" class="reference internal" href="#set_defaults"><tt class="xref docutils literal"><span class="pre">set_defaults()</span></tt></a>:</p>
+<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
+<span class="gp">&gt;&gt;&gt; </span><span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&#39;--foo&#39;</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="s">&#39;badger&#39;</span><span class="p">)</span>
+<span class="gp">&gt;&gt;&gt; </span><span class="n">parser</span><span class="o">.</span><span class="n">get_default</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">)</span>
+<span class="go">&#39;badger&#39;</span>
+</pre></div>
+</div>
+</dd></dl>
+
 </div>
 <div class="section" id="sub-commands">
 <h2>Sub-commands<a class="headerlink" href="#sub-commands" title="Permalink to this headline">¶</a></h2>
diff --git a/doc/searchindex.js b/doc/searchindex.js
index cfa2181..bb98dfa 100644
--- a/doc/searchindex.js
+++ b/doc/searchindex.js
@@ -1 +1 @@
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\ No newline at end of file
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,2,3,5,6,7],parser_foo:2,figur:5,should:[0,2,3,5,6,7],store_const:[3,7,1,5],wood:1,dict:5,"__call__":[7,5],add_opt:7,variou:[5,6],get:[6,3,7,1,2],express:6,report:5,requir:[8,7,1,2,5],bar:[1,2,3,5,6,7],keyword:[1,2,3,5,6,7],baz:[7,5,2],dramat:7,patch:7,store_fals:[5,2],whether:[5,6],bad:[1,5],calcul:6,bac:1,contain:[1,2,5,6,7,8],where:[0,5,6],set:[6,3,7,5,2],"float":[7,5,2],see:[1,2,3,5,6,7],arg:[0,1,2,3,4,5,6,7],close:0,extend:[7,5],correctli:6,someth:3,written:0,subdir:6,between:6,"import":[0,7,5,6,3],awai:5,badger:[7,1,2],across:6,attribut:[1,2,3,5,6,7],altern:6,parent:[8,7,6,2],xrang:[3,7,1,5],disallow:[7,6],extens:7,outfil:5,come:7,addit:[6,7,5,2],both:[7,1],last:[1,6],howev:[6,7,5,2],against:7,etc:[7,1,2,5],eas:5,mani:[7,5],whole:6,simpli:[6,7,1,2,5],point:7,argumentpars:[0,1,2,3,4,5,6,7,8],dispatch:7,featur:7,suppli:[6,3,7,5,2],respect:5,assum:[0,5,2,3],duplic:7,quit:[7,5],coupl:[6,2],addition:5,three:6,empti:1,implicit:7,accumul:[3,1],secret:7,much:[3,7,1,2,5],valu:[1,2,5,6,7,8],basic:5,unambigu:1,print_usag:2,popul:[1,2],strategi:6,epilog:[8,6],suppress:[7,5,6],xxx:[7,5,6],great:5,ani:[6,7,5,2],understand:4,togeth:[1,5],func:2,child:6,repetit:5,those:[7,1],"case":[3,1,2,5],therefor:5,look:[3,7,1],format_help:2,formatt:6,defin:[6,5,2],"while":[7,1,6,5],behavior:[3,5,6],error:[6,7,1,2,5],argpars:[0,1,2,3,4,5,6,7],advantag:[0,7],stdout:[0,4,5],almost:[5,6],kwarg:[7,2],"__init__":7,clearli:1,perform:[5,2],make:[6,3,7,5,2],format:[6,7,5,2],sqrt:5,check:[7,1,2,5],handl:[7,5,2],complex:[7,5],help_:[],split:[1,2,3,5,6,7],document:[8,0,1,6],infer:5,dest_:[],complet:2,dedent:6,foo_bar_baz_pars:7,effect:2,rais:[5,6],user:[6,7,1,2,5],store_act:7,typic:[3,7,5,2],recent:6,appropri:[0,2,3,5,6,7],older:6,argumenttypeerror:5,thu:7,inherit:[7,6],likewis:6,without:2,command:[0,1,2,3,4,5,6,7,8],thi:[0,1,2,3,4,5,6,7],conflict:6,everyth:[7,1],sibl:2,usual:[6,7,5,2],identifi:5,execut:2,add_mutually_exclusive_group:2,note:[6,7,5,2],action_:[],exclus:[8,2],expos:7,had:7,except:[6,2],add:[0,2,3,5,6,7],valid:[7,5,2],remaining_arg:7,rawdescriptionhelpformatt:6,save:[0,3],match:[6,7,1,2,5],applic:[6,2],transpar:7,read:[5,6],textwrap:6,writabl:[4,5],built:[3,1],know:[7,5,2],print_help:[6,7,5,2],like:[1,2,3,5,6,7],insert:[1,6],get_default:2,specif:6,arbitrari:5,whitespac:6,manual:7,resolv:6,integ:[0,5,7,1,3],collect:6,necessari:[3,7,5,2],either:[1,2,3,5,6,7],argumenterror:[7,6],output:[6,4,5,2],unnecessari:6,encount:[3,1,5],old:[6,2],often:5,"0x00b1f020":[],interact:1,some:[1,2,3,5,6,7],back:2,intern:5,mistak:1,proper:7,librari:7,absent:5,subpars:[7,2],avoid:5,normal:[1,2,5],definit:6,per:6,exit:[0,1,2,5,6,7],prog:[1,2,5,6,7,8],foo:[1,2,3,5,6,7],refer:[1,6,5],nargs_:[],object:[0,1,2,3,4,5,6,7,8],run:[0,3],inspect:[3,2],usag:[0,1,2,5,6,7,8],argument_default:[8,6],found:1,add_subpars:[7,2],"__name__":[0,3],"super":7,xyzz:1,about:[6,3,7,5,2],actual:7,callback_:7,optpars:[0,7],constructor:[7,6,2],commit:2,disabl:6,own:[6,7,5,2],xyz:[7,2],within:6,automat:[4,5,6],suppl:2,been:[3,7,5],strip:5,wrap:6,chang:[6,7,5,2],mark:5,yyi:[5,6],your:[6,3,7,5,2],manag:3,inclus:5,fill:[3,6],log:0,wai:[6,7,1,2,5],spam:[7,1,2],support:[6,7,1,2,5],"long":[7,1,6,5],custom:[6,8,1,2,5],avail:[6,5,2],start:[3,6],interfac:[0,7,5,3],includ:[6,7,1,2,5],lot:[7,2],parse_arg:[0,1,2,3,4,5,6,7,8],treat:[6,2],"function":[1,2,5],reduc:7,creation:[6,2],form:[3,7,5],tupl:[5,2],bufsiz:[4,5],msg:5,parents_:[],"0x00b8fe78":[],line:[0,1,2,3,4,5,6,7],conflict_handl:[8,6],concaten:1,made:1,input:5,temp:5,possibl:5,"default":[0,1,2,3,5,6,7,8],checkout:2,argumentdefaultshelpformatt:6,displai:[6,7,5,2],below:[7,5,6],otherwis:6,similar:7,gather:5,constant:5,creat:[0,1,2,3,4,5,6,7],"int":[0,1,2,3,5,6,7],descript:[0,2,3,5,6,8],parser:[0,1,2,3,4,5,6,7,8],"0x00b1f068":[],doesn:[7,5],strongli:2,exist:1,file:[0,2,3,4,5,6,7],xyzyx:2,simplest:1,probabl:5,again:7,readi:3,titl:2,when:[0,1,2,3,5,6,7],detail:[1,6,5],invalid:[8,7,1,5],other:[0,1,2,4,6,7,8],futur:2,scriptnam:0,varieti:1,test:7,set_default:[6,2],you:[1,2,3,5,6,7],bar_pars:[7,6],repeat:6,clean:6,why:7,consid:[5,6],"0x00adf020":[],svn:2,receiv:7,longer:[7,1,2],pseudo:[4,1],time:[7,5,2],backward:7},titles:["Documentation","The 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\ No newline at end of file
diff --git a/doc/source/other-methods.rst b/doc/source/other-methods.rst
index 9f523eb..1e9ca1d 100644
--- a/doc/source/other-methods.rst
+++ b/doc/source/other-methods.rst
@@ -67,6 +67,14 @@ Parser defaults
    
    Parser-level defaults can be particularly useful when you're working with multiple parsers.  See the :meth:`add_subparsers` method for an example of this type.
 
+.. method:: get_default(dest)
+
+   Get the default value for a namespace attribute, as set by either :meth:`add_argument` or by :meth:`set_defaults`::
+   
+     >>> parser = argparse.ArgumentParser()
+     >>> parser.add_argument('--foo', default='badger')
+     >>> parser.get_default('foo')
+     'badger'
 
 Sub-commands
 ------------
diff --git a/test/test_argparse.py b/test/test_argparse.py
index c9ec289..fadc1af 100644
--- a/test/test_argparse.py
+++ b/test/test_argparse.py
@@ -2466,6 +2466,29 @@ class TestSetDefaults(TestCase):
         self.assertEqual(NS(w='WW', x='X', y='YY', z='Z'),
                          parser.parse_args([]))
 
+# =================
+# Get default tests
+# =================
+
+class TestGetDefault(TestCase):
+
+    def test_get_default(self):
+        parser = ErrorRaisingArgumentParser()
+        self.assertEqual(None, parser.get_default("foo"))
+        self.assertEqual(None, parser.get_default("bar"))
+
+        parser.add_argument("--foo")
+        self.assertEqual(None, parser.get_default("foo"))
+        self.assertEqual(None, parser.get_default("bar"))
+
+        parser.add_argument("--bar", type=int, default=42)
+        self.assertEqual(None, parser.get_default("foo"))
+        self.assertEqual(42, parser.get_default("bar"))
+
+        parser.set_defaults(foo="badger")
+        self.assertEqual("badger", parser.get_default("foo"))
+        self.assertEqual(42, parser.get_default("bar"))
+
 # =====================
 # Help formatting tests
 # =====================