I am puzzled by the following (numpy 1.9.0, python 3.4.2): In [1]: t = array(None); t[()] = array([None, None]) # Construct a 0d array of dtype object, containing a single numpy array with 2 elements
In [2]: bool(t) Out[2]: True In [3]: if t: pass --------------------------------------------------------------------------- ValueError Traceback (most recent call last) ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() I thought that "if x" simply calls "bool", but apparently this is not even the case... Antony
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