comments on runpy module

[Alexey Luchko]

Hi!

I've just had fun with the runpy module in Python 2.7. I'm writing to
share it

What I've tried is to "load" a python script using runpy.run_path(), take a
function from the resulting namespace and call it with arbitrary arguments.

All the functions in the namespace seem to be ok. repr(namespace["f"])
gives "<function f at 0x005531F0>".

But if the f() is referring the modules namespace (I supposed it is the
same as the returned one), all the values appear to be None.

Example script.py: """
def f(arg):
return g(arg)

def g(arg):
return arg
"""

Then running main.py: """
import runpy

namespace = runpy.run_path("./script.py")
print namespace["f"]
print namespace["g"]

print namespace["f"]("abc")
"""

gives such an output """
<function f at 0x005524F0>
<function g at 0x023F0830>
Traceback (most recent call last):
File "main.py", line 7, in <module>
print namespace["f"]("abc")
File "./script.py", line 2, in f
return g(arg)
TypeError: 'NoneType' object is not callable
"""

Reading the Lib/runpy.py I've found, that the temporary module created
inside the run_path() calls, is destroyed right after the script.py code
executed in the resulting namespace.

I suppose that it is ether an issue or a feature that should be documented