Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #81223

Re: PyWart: "Python's import statement and the history of external dependencies"

Show key headers only | View raw

On 2014-11-21 07:52, Rick Johnson wrote:
> On Friday, November 21, 2014 4:29:48 AM UTC-6, Tim Chase wrote:
> 
> > What messed-up version of Python are you running?  
> > Or did you fail to test your conjecture?
> > 
> > $ cat > calendar.py
> > print("This is my local calendar.py")
> > x=1
> > $ cat > importtest.py
> > import calendar
> > print(dir(calendar))
> > $ python2 importtest.py 
> > This is my local calendar.py
> > ['__builtins__', '__doc__', '__file__', '__name__',
> > '__package__', 'x'] $ python3 importtest.py
> > This is my local calendar.py
> > ['__builtins__', '__cached__', '__doc__', '__file__', '__name__',
> > '__package__', 'x']
> > 
> > It finds my local module, not the system "calendar" module.
> 
> You failed to provide the needed information!
>     
>   1. We need to see the values in sys.path. So print them
>   directly before making the call to import.
>   
>   2. Where did you store your custom "calendar.py" script?

Had you paid attention, having watched the creation of the two files
and the invocation of stock python, you would know that they were in
the same folder, and there's no modification of sys.path in the
process.  So if you're seeing different behaviors due to a modified
sys.path, then you should be aware that *you* modified sys.path and
thus broke things.

The above was tested on Python2 and Python3, both on Linux (Debian
in this case) and Win32 (using "copy con" instead of "cat >") with the
out-of-box install.

The only time I've been stung by name overloading is in the indirect
case of creating a local email.py file and then importing smtplib
only to have things break in unforeseen ways.  If smtplib used
relative imports for $STDLIB/email.py I suspect it would ameliorate
that particular issue for me.

-tkc

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-15 21:01 -0800
  Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-16 16:16 +1100
  Re: PyWart: "Python's import statement and the history of external dependencies" alex23 <wuwei23@gmail.com> - 2014-11-21 10:14 +1000
    Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-21 11:31 +1100
    Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-20 19:53 -0800
      Re: PyWart: "Python's import statement and the history of external dependencies" Tim Chase <python.list@tim.thechases.com> - 2014-11-21 04:26 -0600
        Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-21 07:52 -0800
          Re: PyWart: "Python's import statement and the history of external dependencies" Tim Chase <python.list@tim.thechases.com> - 2014-11-21 10:12 -0600
          Re: PyWart: "Python's import statement and the history of external dependencies" Ian Kelly <ian.g.kelly@gmail.com> - 2014-11-21 10:42 -0700
      Re: PyWart: "Python's import statement and the history of external dependencies" Ned Batchelder <ned@nedbatchelder.com> - 2014-11-21 06:32 -0500
      Re: PyWart: "Python's import statement and the history of external dependencies" Ian Kelly <ian.g.kelly@gmail.com> - 2014-11-21 08:33 -0700
        Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-21 10:24 -0800
          Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-22 05:34 +1100
          Re: PyWart: "Python's import statement and the history of external dependencies" Michael Torrie <torriem@gmail.com> - 2014-11-21 12:05 -0700
            Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-21 12:29 -0800
              Re: PyWart: "Python's import statement and the history of external dependencies" Michael Torrie <torriem@gmail.com> - 2014-11-21 15:54 -0700
          Re: PyWart: "Python's import statement and the history of external dependencies" Ian Kelly <ian.g.kelly@gmail.com> - 2014-11-21 12:23 -0700
            Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-21 14:25 -0800
              Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-21 15:21 -0800
                Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-22 10:52 +1100
                Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-21 17:07 -0800
                Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-22 13:36 +1100
                Re: PyWart: "Python's import statement and the history of external dependencies" Ian Kelly <ian.g.kelly@gmail.com> - 2014-11-22 02:27 -0700
                Re: PyWart: "Python's import statement and the history of external dependencies" sohcahtoa82@gmail.com - 2014-11-21 16:33 -0800
                Import a module from a specific file path (was: PyWart: "Python's import statement and the history of external dependencies") Ben Finney <ben+python@benfinney.id.au> - 2014-11-22 11:37 +1100
                Re: Import a module from a specific file path Marko Rauhamaa <marko@pacujo.net> - 2014-11-22 08:28 +0200
                Re: Import a module from a specific file path (was: PyWart: "Python's import statement and the history of external dependencies") Chris Angelico <rosuav@gmail.com> - 2014-11-22 13:32 +1100
                Re: Import a module from a specific file path Ben Finney <ben+python@benfinney.id.au> - 2014-11-22 17:46 +1100
              Re: PyWart: "Python's import statement and the history of external dependencies" Ian Kelly <ian.g.kelly@gmail.com> - 2014-11-21 17:32 -0700
                Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-21 17:48 -0800
          Re: PyWart: "Python's import statement and the history of external dependencies" Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-21 15:38 -0500
        Re: PyWart: "Python's import statement and the history of external dependencies" Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-22 23:25 +1100
          Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-23 00:00 +1100
            Re: PyWart: "Python's import statement and the history of external dependencies" Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-23 17:30 +1100
              Re: PyWart: "Python's import statement and the history of external dependencies" Rustom Mody <rustompmody@gmail.com> - 2014-11-22 22:44 -0800
              Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-23 17:56 +1100
              Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-23 17:59 +1100
                Re: PyWart: "Python's import statement and the history of external   dependencies" Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-11-24 11:37 +1300
                Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-23 22:25 -0800
                Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-24 17:34 +1100
                Re: PyWart: "Python's import statement and the history of external dependencies" Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-11-24 10:34 +0000
                Re: PyWart: "Python's import statement and the history of external dependencies" Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-24 08:51 -0800
                Re: PyWart: "Python's import statement and the history of external dependencies" Ned Batchelder <ned@nedbatchelder.com> - 2014-11-24 12:06 -0500
                Re: PyWart: "Python's import statement and the history of external dependencies" Robin Becker <robin@reportlab.com> - 2014-11-24 17:07 +0000
                Re: PyWart: "Python's import statement and the history of external dependencies" Marko Rauhamaa <marko@pacujo.net> - 2014-11-24 19:08 +0200
                Re: PyWart: "Python's import statement and the history of external dependencies" Rustom Mody <rustompmody@gmail.com> - 2014-11-24 09:38 -0800
                Re: PyWart: "Python's import statement and the history of external dependencies" Ian Kelly <ian.g.kelly@gmail.com> - 2014-11-24 15:34 -0700
              Re: PyWart: "Python's import statement and the history of external dependencies" Ben Finney <ben+python@benfinney.id.au> - 2014-11-23 18:43 +1100
              Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-23 18:51 +1100
              Re: PyWart: "Python's import statement and the history of external dependencies" Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-23 11:23 -0500
              Re: PyWart: "Python's import statement and the history of external dependencies" Chris Angelico <rosuav@gmail.com> - 2014-11-24 03:36 +1100
          Re: PyWart: "Python's import statement and the history of external dependencies" Tim Chase <python.list@tim.thechases.com> - 2014-11-22 15:27 -0600
            Re: PyWart: "Python's import statement and the history of external dependencies" Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-23 12:00 +1100
              Re: PyWart: "Python's import statement and the history of external dependencies" Tim Chase <python.list@tim.thechases.com> - 2014-11-22 19:33 -0600

csiph-web