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What's needed for jpegtran in Python 3?


Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Sep 28, 2018 at 3:51 AM Chris Green <cl at isbd.net> wrote:
> >
> > Chris Angelico <rosuav at gmail.com> wrote:
> > > On Fri, Sep 28, 2018 at 2:51 AM Chris Green <cl at isbd.net> wrote:
> > > >
> > > > I'm converting an existing Python2 program to Python3, it uses
> > > > jpegtran and I can't find what to install to get this in Python3.
> > > >
> > > > Can anyone advise what I need to install in Python3?
> > > >
> > >
> > > Do you mean this?
> > >
> > > https://pypi.org/project/jpegtran-cffi/
> > >
> > > I can't find anything called just "jpegtran" for either Py2 or Py3,
> > > but that one claims to work on 3.3+ as well as 2.6 and 2.7.
> > >
> > I think that must be what I have already installed, it doesn't make
> > the module available in Python 3, it just says this when I try and
> > install it:-
> >
> >     root at t470:~# pip install jpegtran-cffi
> >     Requirement already satisfied: jpegtran-cffi in /usr/local/lib/python2.7/dist-packages
> > Requirement already satisfied: cffi>=0.8 in /usr/lib/python2.7/dist-packages 
> (from jpegtran-cffi) 
> >     root at t470:~#
> >
> > Python 3 isn't going to find that is it?
> 
> Ah! Correct. What you need to do is use pip from your Python 3
> installation. The safest way is:
> 
> python3 -m pip install jpegtran-cffi
> 
> but you may be able to abbreviate it to just:
> 
> pip3 install jpegtran-cffi
> 
> ie just change "pip" to "pip3".
> 
OK, yes, after a bit of trouble (I needed python3-cffi as well) I've
got it installed now, thank you!

-- 
Chris Green
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