I'm trying to learn about introspection in Python. my ultimate goal
is to be able to build a module "text database" of all modules that
are in the sys.path, by discovering all candidate modules (I've
already done that), importing all of them, and then introspecting on
each module to discover its functions, globals and classes. But for
now I am having a problem with the latter.
I would like to import a module and figure out the names of its
defined functions, globals, and classes. Here's my attempt, file
foo.py, which has a single function, class, and global defined:
#!/usr/bin/env python
def somefunction(i):
i = i + 1
class someclass:
def __init__(self):
self.x = 0
self.y = 1
someglobal = 1.2
if __name__ == "__main__": # when run as a script
import foo
import inspect
from inspect import *
isfuncs = filter(lambda x: re.match("^is", x) and x, dir(inspect))
print isfuncs
print filter(lambda x: re.match("some", x[0]) and x[0], getmembers(foo))
for f in isfuncs:
exec('print "trying %20s: ",; print getmembers(foo, %s)' % (f, f))
the output of running it as a script is the following:
['isbuiltin', 'isclass', 'iscode', 'isdatadescriptor', 'isframe',
'isfunction', 'ismethod', 'ismethoddescriptor', 'ismodule', 'isroutine',
'istraceback']
[('someclass', <class foo.someclass at 0x40058ddc>), ('somefunction',
<function somefunction at 0x40066a74>), ('someglobal', 1.2)]
trying isbuiltin: []
trying isclass: [('someclass', <class foo.someclass at
0x40058ddc>)]
trying iscode: []
trying isdatadescriptor: []
trying isframe: []
trying isfunction: [('somefunction', <function somefunction at
0x40066a74>)]
trying ismethod: []
trying ismethoddescriptor: []
trying ismodule: []
trying isroutine: [('somefunction', <function somefunction at
0x40066a74>)]
trying istraceback: []
I was trying to use inspect.getmembers(foo, <PRED>) with an
appropriate predicate ("is" function). it looks like I am able to
discover that 'someclass' is a class, and that 'somefunction' is a
function (and also a routine, apparently). However, I cannot seem to
discover that 'someglobal' is a global. How to do so? Thanks,
--
Benjamin Rutt
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