Well, this works on Python 2 only (I'm on a phone with only access to 2 right now), but this is a start (apologies for the screwy syntax highlighting):

import sys, imp, logging, os

modules = '''
imp
string
...
'''.split()

class StdlibTester(object):
base = os.path.dirname(os.__file__) # hack; is there a better way to do this?

def find_module(self, fullname, path=None):
if fullname in modules:
self.path = path
return self
return None

def load_module(self, name):
if name in sys.modules:
return sys.modules[name]
module_info = imp.find_module(name, self.path)
module = imp.load_module(name, *module_info)
sys.modules[name] = module

if hasattr(module, '__file__') and not os.path.dirname(module.__file__).startswith(self.base):
logging.warning('stdlib module %s was overriden', name)

return module

sys.meta_path.append(StdlibTester())
import string


On October 29, 2015 7:06:51 PM CDT, "R. David Murray" <rdmurray@bitdance.com> wrote:
On Thu, 29 Oct 2015 16:56:38 -0700, Nathaniel Smith <njs@pobox.com> wrote:
 On Thu, Oct 29, 2015 at 1:50 PM, Ryan Gonzalez <rymg19@gmail.com> wrote:
 Why not just check the path of the imported modules and compare it with the
 Python library directory?
 
 It works, but it requires that everyone who could run into this
 problem carefully add some extra guard code to every stdlib import
 statement, and in practice nobody will (or at least, not until after
 they've already gotten bitten by this at least once... at which point
 they no longer need it).
 
 Given that AFAICT there's no reason this couldn't be part of the
 default import system's
functionality and "just work" for everyone, if
 I were going to spend time on trying to fix this I'd probably target
 that :-).
 
 (I guess the trickiest bit would be to find an efficient and
 maintainable way to check whether a given package name is present in
 the stdlib.)

For Idle, though, it sounds like a very viable strategy, and that's
what Laura is concerned about.

--David

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