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2013-10-15T03:40:38.017
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2013-10-15T03:40:38.017
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A ctypes array is initialized with positional arguments. An initial value can be a ctypes data object, a Python object compatible with a simple data type (for an array of simple types such as <code>c_int * 20</code>), or a tuple of positional arguments used to create a temporary instance of the array's data type to be copied (<code>memcpy</code>) into the array. Since you need a keyword argument to select the proper converter, you'll have to either call <code>MyValue</code> to manually create the temporary instance, or call <code>setattr</code> on each item of an unitialized array. For the former, you can use a generator expression combined with <code>*</code> and <code>**</code> unpacking (see the <a href="http://docs.python.org/2/tutorial/controlflow.html#unpacking-argument-lists" rel="nofollow">tutorial</a>): <pre><code>values = [ ('ftInt', 12), ('ftString', 'testing'), ] arr = MyValues(*(MyValue(**{k: v}) for k, v in values)) </code></pre> And here's an alternative using <a href="http://docs.python.org/2/library/functions.html#setattr" rel="nofollow"><code>setattr</code></a> to update the array in a loop: <pre><code>arr = MyValues() for item, value in zip(arr, values): setattr(item, *value) # note the * unpacking </code></pre> <hr> It would be nice to add support for a keyword argument dict in <a href="http://hg.python.org/cpython/file/ab05e7dd2788/Modules/_ctypes/_ctypes.c#l2850" rel="nofollow"><code>_PyCData_set</code></a> (Modules/ctypes/_ctypes.c).
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