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numpy float multiplied by a string does not raise a TypeError #5919

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numpy float multiplied by a string does not raise a TypeError#5919

Description

@ngoldbaum
ngoldbaum
opened on May 27, 2015

This illustrates the issue:

>>> import numpy as np 
>>> print 'x'*np.float64(3.5)

The same construction using a regular python float raises a TypeError, as I would expect:

>>> 'x'*3.5
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't multiply sequence by non-int of type 'float'

I haven't looked very closely at the implementation of the numpy float class. Please feel free to close this issue if this is working as expected.

This is on numpy 1.9.2 and python 2.7.9

Activity

  1. njsmith commented on May 27, 2015

    @njsmith
    njsmith
    on May 27, 2015
    Member
    In [1]: import warnings

In [2]: warnings.simplefilter("always")

In [3]: "x" * np.float64(3.5)
/home/njs/.user-python2.7-64bit-3/bin/ipython:1: DeprecationWarning: using a non-integer number instead of an integer will result in an error in the future
  #!/home/njs/.user-python2.7-64bit-3/bin/python
Out[3]: 'xxx'

    We really need to do something about DeprecationWarnings not showing up interactively, it bites people constantly :-/

  2. njsmith
    closed this as completedon May 27, 2015

  3. njsmith commented on May 27, 2015

    @njsmith
    njsmith
    on May 27, 2015
    Member

    (Closing b/c there should be an issue for turning that DeprecationWarning into an error at some point... though I haven't double-checked :-))

  4. ngoldbaum commented on May 27, 2015

    @ngoldbaum
    ngoldbaum
    on May 27, 2015
    MemberAuthor

    I agree that the way DeprecationWarning is hidden by default makes it pretty much useless. Thanks for clearing that up!

  5. jakirkham commented on Feb 3, 2016

    @jakirkham
    jakirkham
    on Feb 3, 2016
    Contributor

    Interesting coming across this today. Yeah, I think I agree. Did an issue ever get opened or confirmed for this?

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