On 01/17/2013 01:27 PM, josef.p...@gmail.com wrote: > On Thu, Jan 17, 2013 at 2:34 AM, Matthieu Brucher > <matthieu.bruc...@gmail.com> wrote: >> Hi, >> >> Actually, this behavior is already present in other languages, so I'm -1 on >> additional verbosity. >> Of course a += b is not the same as a = a + b. The first one modifies the >> object a, the second one creates a new object and puts it inside a. The >> behavior IS consistent. > > The inplace operation is standard, but my guess is that the silent > downcasting is not. > > in python > >>>> a = 1 >>>> a += 5.3 >>>> a > 6.2999999999999998 >>>> a = 1 >>>> a *= 1j >>>> a > 1j > > I have no idea about other languages.
I don't think the comparison with Python scalars is relevant since they are immutable: In [9]: a = 1 In [10]: b = a In [11]: a *= 1j In [12]: b Out[12]: 1 In-place operators exists for lists, but I don't know what the equivalent of a down-cast would be... In [3]: a = [0, 1] In [4]: b = a In [5]: a *= 2 In [6]: b Out[6]: [0, 1, 0, 1] Dag Sverre _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
