Is there a better way to get an enumerator from an object passed in to
a C# implemented module?
IEnumerator e = null;
if (sequence is IEnumerator)
e = sequence as IEnumerator;
else if (sequence is IEnumerable)
e = ((IEnumerable)sequence).GetEnumerator();
if (e == null)
throw PythonOps.TypeError("writerows() argument must be iterable");
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