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copied!<p><strong>EDIT:</strong> Ruby 2.0 introduces the splat operator and keyword arguments, so if you are using Ruby >= 2.0 you can just use <code>foo(arg, keyword: arg_default)</code> and <code>foo(1, **{:keyword => arg})</code>. If you are using Ruby 1.x then what follows applies:</p> <hr> <p>Ruby 1.x doesn't have a splat operator for keyword arguments (in fact, Ruby 1.x doesn't even <strong>have</strong> keyword arguments). Instead, you would simply have <code>config</code> as your last argument and users of your function can pass in a hash out of which you pull keys:</p> <pre><code>foo(arg1, arg2, config) bar(newarg1, newarg2, config) </code></pre> <p>In <em>Python</em> you'd define <code>foo</code> and <code>bar</code> in this manner:</p> <pre><code>def foo(arg1, arg2, **config): # config now contains any keyword arguments passed to foo </code></pre> <p>And call it:</p> <pre><code>foo(1, 2, some="key", another="value") # or if you have a hash from elsewhere foo(1, 2, **{"some": "key", "another": "value"}) </code></pre> <p>In <em>Ruby</em> a similar construct is achieved in this manner:</p> <pre><code>def foo(arg1, arg2, config={}) # config is *still* a positional argument even though it has a default value! # do stuff with your configuration hash # as if it were a dictionary of keyword args # for example: default_config = {:options {:key => 'value'}, :stuff => 123} config = default_config.merge(config) end </code></pre> <p>And it is called in this manner:</p> <pre><code>foo(1, 2, :some => 'key', :another => 'value') # which translates into foo(1, 2, {:some => 'key', :another => 'value'}) # the {} are optional for the last argument </code></pre> <p>If we were to translate that Ruby code <em>directly</em> into Python it would look <em>something</em> like this:</p> <pre><code>def foo(arg1, arg2, config=None): # This is not *quite* exact because we can still call `foo(1, 2, config={})` # but I think it is as close as you can get in Python if config is None: config = {} # Now we can do things with the config dictionary. </code></pre> <p>And you would call it:</p> <pre><code># Note: no ** (splat) operator in front of our dictionary foo(1, 2, {"some": "key", "another": "value"}) </code></pre>

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