Implicit Conversions

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  • Reneé
    #1

    Implicit Conversions

    I wanted to know the order of implicit conversions and which sort of values
    allow them. From searching around in books and the archive of this mailing
    list, it seems to be that only numbers are implicitly converted within each
    other and bools can be implicitly converted to ints? However, I'm unable to
    find any other implicit conversions and the order of the implicit
    conversions (something like int->float->long). Any help would be greatly
    apprectiated. Also, I'm not on the mailing list so can everyone please cc me
    in the replies?
    Reneé


    Tags: None
    • Mel Wilson
      #2
      Re: Implicit Conversions

      In article <mailman.112.10 71251837.9307.p ython-list@python.org >,
      "=?iso-8859-1?B?UmVuZek=?=" <rlogan@hmc.edu > wrote:[color=blue]
      >I wanted to know the order of implicit conversions and which sort of =
      >values
      >allow them. From searching around in books and the archive of this =
      >mailing
      >list, it seems to be that only numbers are implicitly converted within =
      >each
      >other and bools can be implicitly converted to ints? However, I'm unable =
      >to
      >find any other implicit conversions and the order of the implicit
      >conversions (something like int->float->long). Any help would be greatly
      >apprectiated . Also, I'm not on the mailing list so can everyone please =
      >cc me
      >in the replies?[/color]

      Anybody?

      Speaking as a Python programmer (not a Python developer),
      I would say that Python doesn't generally do implicit
      conversions. The programmer keeps track of the types of the
      operands passed to operators and functions, and the
      operators and functions do what they can with what they get.

      You have it right that the arithemetic operators work so
      as not to lose "comprehensivit y": an operation on a complex
      yields a complex OR an operation on a float yields a float,
      OR an operation on a long yields a long OR the operation
      yields an int. (Those are Python short-circuiting OR's
      there.)

      Regards. Mel.

        Comment

        • Serge Orlov
          #3
          Re: Implicit Conversions


          "Mel Wilson" <mwilson@the-wire.com> wrote in message news:Ex02/ks/KzJT089yn@the-wire.com...[color=blue]
          > In article <mailman.112.10 71251837.9307.p ython-list@python.org >,
          > "=?iso-8859-1?B?UmVuZek=?=" <rlogan@hmc.edu > wrote:[color=green]
          > >I wanted to know the order of implicit conversions and which sort of =
          > >values
          > >allow them. From searching around in books and the archive of this =
          > >mailing
          > >list, it seems to be that only numbers are implicitly converted within =
          > >each
          > >other and bools can be implicitly converted to ints? However, I'm unable =
          > >to
          > >find any other implicit conversions and the order of the implicit
          > >conversions (something like int->float->long). Any help would be greatly
          > >apprectiated . Also, I'm not on the mailing list so can everyone please =
          > >cc me
          > >in the replies?[/color]
          >
          > Anybody?
          >
          > Speaking as a Python programmer (not a Python developer),
          > I would say that Python doesn't generally do implicit
          > conversions.[/color]
          To be more specific Python Virtual Machine doesn't do implicit
          conversions. However any class including builtin ones can
          convert any input argument to any other type. From the
          outer point of view (e.g. user of int class) it's implicit conversion,
          but from inner point of view (e.g. int class) there is no implicit
          conversions of input arguments so the int class has to explicitly
          convert them.

          -- Serge.


            Comment

            • John Roth
              #4
              Re: Implicit Conversions

              The coercion rules are documented in the Python Reference Manual under
              Data Model - Special Method Names - Coercion Rules.

              John Roth


              "Reneé" <rlogan@hmc.edu > wrote in message
              news:mailman.11 2.1071251837.93 07.python-list@python.org ...
              I wanted to know the order of implicit conversions and which sort of values
              allow them. From searching around in books and the archive of this mailing
              list, it seems to be that only numbers are implicitly converted within each
              other and bools can be implicitly converted to ints? However, I'm unable to
              find any other implicit conversions and the order of the implicit
              conversions (something like int->float->long). Any help would be greatly
              apprectiated. Also, I'm not on the mailing list so can everyone please cc me
              in the replies?
              Reneé




                Comment

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