It seems they canceled in Python 3.0 all the easy way to quickly load a script file - both execfile() and reload().
Is there an obvious alternative I'm missing?
+6
A:
If the script you want to load is in the same directory than the one you run, maybe "import" will do the job ?
If you need to dynamically import code the built-in function __ import__ and the module imp are worth looking at.
>>> import sys
>>> sys.path = ['/path/to/script'] + sys.path
>>> __import__('test')
<module 'test' from '/path/to/script/test.pyc'>
>>> __import__('test').run()
'Hello world!'
test.py:
def run():
return "Hello world!"
Finally, it's worth noting that importlib looks likely to be included in 3.1, though that's kind of far-future right now.
ascobol
2009-01-12 17:28:15
+4
A:
def execfile(file, globals=globals(), locals=locals()):
with open(file, "r") as fh:
exec(fh.read()+"\n", globals, locals)
If you really needed to...
Evan Fosmark
2009-01-12 17:38:43
+1, but the example should probably use 'with fh=open(...):'
orip
2009-01-12 18:44:38
@orip: No, it shouldn't. You can't have assignment in an expression in python.
nosklo
2009-08-22 13:32:39
-1: the exec statment doesn't work this way. Code doesn't run in any version of python.
nosklo
2009-08-22 13:33:45
-1: Not reliable. Some uses of execfile are incompatible.
Brian
2009-12-27 10:30:03
A:
If you have to use execfile, you have a design problem.
Of course you can always read the entire file as a string and use the exec statement on it. But it would be even better to rethink your application's design so you won't need it in first place.
nosklo
2009-01-12 17:54:46
The problem is of course that I don't have an application, I am doing interactive research. I need to write quick functions and check them in the interpreter quickly...
R S
2009-01-13 23:31:05
Some interactive applications (with a python prompt) use execfile as the main way to load up the next job description file, for example CERN's ganga.
kaizer.se
2009-08-22 12:25:04
+3
A:
You are just supposed to read the file and exec the code yourself. 2to3 current replaces
execfile("somefile.py", local_vars, global_vars)
as
exec(compile(open("somefile.py").read(), "somefile.py", 'exec'), local_vars, global_vars)
(The compile call isn't strictly needed, but it associates the filename with the code object making debugging a little easier.)
Benjamin Peterson
2009-01-13 03:20:59
This works for me. However, I noticed that you've written the local and global arguments in the wrong order. It's actually: exec(object[, globals[, locals]]). Of course if you had the arguments flipped in the original, then 2to3 will produce exactly what you said. :)
Nathan Sanders
2009-05-21 20:27:17
A:
This one is better, since it takes the globals and locals from the caller:
import sys
def execfile(filename, globals=None, locals=None):
if globals is None:
globals = sys._getframe(1).f_globals
if locals is None:
locals = sys._getframe(1).f_locals
with open(filename, "r") as fh:
exec(fh.read()+"\n", globals, locals)
Noam
2010-05-17 12:43:26