Using remote source code

[pyapplico]

Is there any possible way that I can place a .py file on the internet,
and use that source code in an .py file on my computer?

[Alex Martelli]

<py*******@gmail.comwrote:

Is there any possible way that I can place a .py file on the internet,
and use that source code in an .py file on my computer?

You can write an import hook in any way you like; see
<http://www.python.org/dev/peps/pep-0302/.

Here's a trivial example (bereft of much error checking, etc). I've
uploaded to http://www.aleax.it/foo.py a toy module w/contents:

def foo(): return 'foo'

Here's a tiny program to import said module from my site:
import urllib2, sys, new

theurl = 'http://www.aleax.it/'

class Examp(object):
names = set([ 'foo', ])
def find_module(self, fullname, path=None):
if fullname not in self.names: return None
self.foo = urllib2.urlopen(theurl+fullname+'.py')
return self
def load_module(self, fullname):
module = sys.modules.setdefault(fullname,
new.module(fullname))
module.__file__ = fullname
module.__loader__ = self
exec self.foo.read() in module.__dict__
return module

def hooker(pathitem):
print 'hooker %r' % pathitem
if pathitem.startswith(theurl): return Examp()
raise ImportError

sys.path_hooks.append(hooker)
sys.path.append(theurl)

import foo
print foo.foo()

Alex

[pyapplico]

On Mar 25, 3:20 pm, [e-mail] (Alex Martelli) wrote:

<[e-mail]:

Is there any possible way that I can place a .py file on the internet,
and use that source code in an .py file on my computer?

You can write an import hook in any way you like; see
<http://www.python.org/dev/peps/pep-0302/.

Here's a trivial example (bereft of much error checking, etc). I've
uploaded tohttp://www.aleax.it/foo.pya toy module w/contents:

def foo(): return 'foo'

Here's a tiny program to import said module from my site:

import urllib2, sys, new

theurl = 'http://www.aleax.it/'

class Examp(object):
names = set([ 'foo', ])
def find_module(self, fullname, path=None):
if fullname not in self.names: return None
self.foo = urllib2.urlopen(theurl+fullname+'.py')
return self
def load_module(self, fullname):
module = sys.modules.setdefault(fullname,
new.module(fullname))
module.__file__ = fullname
module.__loader__ = self
exec self.foo.read() in module.__dict__
return module

def hooker(pathitem):
print 'hooker %r' % pathitem
if pathitem.startswith(theurl): return Examp()
raise ImportError

sys.path_hooks.append(hooker)
sys.path.append(theurl)

import foo
print foo.foo()

Alex

Thanks for your help, now I can continue building my source code
generator. :)

[Shane Geiger]

Alex,

I see that you aren't using ihooks. Below is an example I found that
uses ihooks. I think it would be worth comparing and contrasting both
approaches (though I am not familar enough with this aspect of Python to
do so). IIRC, this code addresses some path related issues of other
import-from-file methods.

Note: This might not work from within ipython, but it works from within
Python.

"""
The ihooks module
This module provides a framework for import replacements. The idea is to
allow several alternate
import mechanisms to co-exist.

Example: Using the ihooks module
"""
import os
def writefile(f, data, perms=750): open(f, 'w').write(data) and
os.chmod(f, perms)

foobar = """
print "this is from the foobar module"

def x():
print "This is the x function."

"""

writefile('/tmp/foobar.py', foobar)
# File:ihooks-example-1.py
import ihooks, imp, os, sys
def import_from(filename):
"Import module from a named file"
if not os.path.exists(filename):
sys.stderr.write( "WARNING: Cannot import file." )
loader = ihooks.BasicModuleLoader()
path, file = os.path.split(filename)
name, ext = os.path.splitext(file)
m = loader.find_module_in_dir(name, path)
if not m:
raise ImportError, name
m = loader.load_module(name, m)
return m

foo = import_from("/tmp/foobar.py")

print foo.x
print foo.x()
print foo.x()


py*******@gmail.com wrote:

On Mar 25, 3:20 pm, [e-mail] (Alex Martelli) wrote:

><[e-mail]:

>>Is there any possible way that I can place a .py file on the internet,
and use that source code in an .py file on my computer?

You can write an import hook in any way you like; see
<http://www.python.org/dev/peps/pep-0302/.

Here's a trivial example (bereft of much error checking, etc). I've
uploaded tohttp://www.aleax.it/foo.pya toy module w/contents:

def foo(): return 'foo'

Here's a tiny program to import said module from my site:

import urllib2, sys, new

theurl = 'http://www.aleax.it/'

class Examp(object):
names = set([ 'foo', ])
def find_module(self, fullname, path=None):
if fullname not in self.names: return None
self.foo = urllib2.urlopen(theurl+fullname+'.py')
return self
def load_module(self, fullname):
module = sys.modules.setdefault(fullname,
new.module(fullname))
module.__file__ = fullname
module.__loader__ = self
exec self.foo.read() in module.__dict__
return module

def hooker(pathitem):
print 'hooker %r' % pathitem
if pathitem.startswith(theurl): return Examp()
raise ImportError

sys.path_hooks.append(hooker)
sys.path.append(theurl)

import foo
print foo.foo()

Alex

Thanks for your help, now I can continue building my source code
generator. :)

--
Shane Geiger
IT Director
National Council on Economic Education
sg*****@ncee.net | 402-438-8958 | http://www.ncee.net

Leading the Campaign for Economic and Financial Literacy

[Jorge Godoy]

py*******@gmail.com writes:

Is there any possible way that I can place a .py file on the internet,
and use that source code in an .py file on my computer?

Besides Alex suggestion, you can also check Pyro.

--
Jorge Godoy <jg****@gmail.com>

[Gabriel Genellina]

En Sun, 25 Mar 2007 04:06:21 -0300, Shane Geiger <sg*****@ncee.net>
escribió:

I see that you aren't using ihooks. Below is an example I found that
uses ihooks. I think it would be worth comparing and contrasting both
approaches (though I am not familar enough with this aspect of Python to
do so). IIRC, this code addresses some path related issues of other
import-from-file methods.

ihooks is rather old and undocumented except for a comment saying that it
"may become obsolete".
PEP 302 sets the recomended way now, AFAIK.

--
Gabriel Genellina