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urlopen in python3

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  urlopen in python3 Olive <diolu.remove_this_part@bigfoot.com> - 2012-12-05 23:40 +0100
    RE: urlopen in python3 Nick Cash <nick.cash@npcinternational.com> - 2012-12-05 22:54 +0000
      Re: urlopen in python3 Olive <diolu.remove_this_part@bigfoot.com> - 2012-12-06 00:42 +0100

#34337 — urlopen in python3

In python2, I use this code:

a=urllib.urlopen(something)

In python2, this work if "something" is a regular file on the system as
well as a remote URL. The 2to3 script convert this
to urllib.request.urlopen. But it does not work anymore if "something"
is just a file name. 

My aim is to let the user specify a "file" on the command line and have
something that works, whatever the "file " actually is: a regular file,
an http url, etc...

Olive

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#34339

> In python2, this work if "something" is a regular file on the system as
> well as a remote URL. The 2to3 script convert this to
> urllib.request.urlopen. But it does not work anymore if "something"
> is just a file name.
> 
> My aim is to let the user specify a "file" on the command line and have
> something that works, whatever the "file " actually is: a regular file,
> an http url, etc...

A file path, such as "/etc/passwd", isn't properly a URL, so urllib correctly refuses to handle it. You can make it a URL by using the file:// protocol, i.e. "file:///etc/passwd"... which appears to work in both python2 and python3.

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#34345

Nick Cash <nick.cash@npcinternational.com> wrote:
> > In python2, this work if "something" is a regular file on the
> > system as well as a remote URL. The 2to3 script convert this to
> > urllib.request.urlopen. But it does not work anymore if "something"
> > is just a file name.
> > 
> > My aim is to let the user specify a "file" on the command line and
> > have something that works, whatever the "file " actually is: a
> > regular file, an http url, etc...
> 
> A file path, such as "/etc/passwd", isn't properly a URL, so urllib
> correctly refuses to handle it. You can make it a URL by using the
> file:// protocol, i.e. "file:///etc/passwd"... which appears to work
> in both python2 and python3.
> 


That's true a file path is not an URL, yet the python2 behaviour was
handy. I do not know in advance if it is a file or an URL, so 
what's the best way to hadle the case? I imagine someling like:

if os.path.exists(something):
	something="file://"+os.path.abspath(something)
a=urllib.request.urlopen(something)

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