Lib/test/test_inspect.py

source = '''# line 1
'A module docstring.'

import sys, inspect
# line 5

# line 7
def spam(a, b, c, d=3, (e, (f,))=(4, (5,)), *g, **h):
    eggs(b + d, c + f)

# line 11
def eggs(x, y):
    "A docstring."
    global fr, st
    fr = inspect.currentframe()
    st = inspect.stack()
    p = x
    q = y / 0

# line 20
class StupidGit:
    """A longer,

    indented

    docstring."""
# line 27

    def abuse(self, a, b, c):
        """Another

\tdocstring

        containing

\ttabs
\t
        """
        self.argue(a, b, c)
# line 40
    def argue(self, a, b, c):
        try:
            spam(a, b, c)
        except:
            self.ex = sys.exc_info()
            self.tr = inspect.trace()

# line 48
class MalodorousPervert(StupidGit):
    pass

class ParrotDroppings:
    pass

class FesteringGob(MalodorousPervert, ParrotDroppings):
    pass
'''

# Functions tested in this suite:
# ismodule, isclass, ismethod, isfunction, istraceback, isframe, iscode,
# isbuiltin, isroutine, getmembers, getdoc, getfile, getmodule,
# getsourcefile, getcomments, getsource, getclasstree, getargspec,
# getargvalues, formatargspec, formatargvalues, currentframe, stack, trace

from test_support import TestFailed, TESTFN
import sys, imp, os, string

def test(assertion, message, *args):
    if not assertion:
        raise TestFailed, message % args

import inspect

file = open(TESTFN, 'w')
file.write(source)
file.close()

# Note that load_source creates file TESTFN+'c' or TESTFN+'o'.
mod = imp.load_source('testmod', TESTFN)
files_to_clean_up = [TESTFN, TESTFN + 'c', TESTFN + 'o']

def istest(func, exp):
    obj = eval(exp)
    test(func(obj), '%s(%s)' % (func.__name__, exp))
    for other in [inspect.isbuiltin, inspect.isclass, inspect.iscode,
                  inspect.isframe, inspect.isfunction, inspect.ismethod,
                  inspect.ismodule, inspect.istraceback]:
        if other is not func:
            test(not other(obj), 'not %s(%s)' % (other.__name__, exp))

git = mod.StupidGit()
try:
    1/0
except:
    tb = sys.exc_traceback

istest(inspect.isbuiltin, 'sys.exit')
istest(inspect.isbuiltin, '[].append')
istest(inspect.isclass, 'mod.StupidGit')
istest(inspect.iscode, 'mod.spam.func_code')
istest(inspect.isframe, 'tb.tb_frame')
istest(inspect.isfunction, 'mod.spam')
istest(inspect.ismethod, 'mod.StupidGit.abuse')
istest(inspect.ismethod, 'git.argue')
istest(inspect.ismodule, 'mod')
istest(inspect.istraceback, 'tb')
test(inspect.isroutine(mod.spam), 'isroutine(mod.spam)')
test(inspect.isroutine([].count), 'isroutine([].count)')

classes = inspect.getmembers(mod, inspect.isclass)
test(classes ==
     [('FesteringGob', mod.FesteringGob),
      ('MalodorousPervert', mod.MalodorousPervert),
      ('ParrotDroppings', mod.ParrotDroppings),
      ('StupidGit', mod.StupidGit)], 'class list')
tree = inspect.getclasstree(map(lambda x: x[1], classes), 1)
test(tree ==
     [(mod.ParrotDroppings, ()),
      (mod.StupidGit, ()),
      [(mod.MalodorousPervert, (mod.StupidGit,)),
       [(mod.FesteringGob, (mod.MalodorousPervert, mod.ParrotDroppings))
       ]
      ]
     ], 'class tree')

functions = inspect.getmembers(mod, inspect.isfunction)
test(functions == [('eggs', mod.eggs), ('spam', mod.spam)], 'function list')

test(inspect.getdoc(mod) == 'A module docstring.', 'getdoc(mod)')
test(inspect.getcomments(mod) == '# line 1\n', 'getcomments(mod)')
test(inspect.getmodule(mod.StupidGit) == mod, 'getmodule(mod.StupidGit)')
test(inspect.getfile(mod.StupidGit) == TESTFN, 'getfile(mod.StupidGit)')
test(inspect.getsourcefile(mod.spam) == TESTFN, 'getsourcefile(mod.spam)')
test(inspect.getsourcefile(git.abuse) == TESTFN, 'getsourcefile(git.abuse)')

def sourcerange(top, bottom):
    lines = string.split(source, '\n')
    return string.join(lines[top-1:bottom], '\n') + '\n'

test(inspect.getsource(git.abuse) == sourcerange(29, 39),
     'getsource(git.abuse)')
test(inspect.getsource(mod.StupidGit) == sourcerange(21, 46),
     'getsource(mod.StupidGit)')
test(inspect.getdoc(mod.StupidGit) ==
     'A longer,\n\nindented\n\ndocstring.', 'getdoc(mod.StupidGit)')
test(inspect.getdoc(git.abuse) ==
     'Another\n\ndocstring\n\ncontaining\n\ntabs\n\n', 'getdoc(git.abuse)')
test(inspect.getcomments(mod.StupidGit) == '# line 20\n',
     'getcomments(mod.StupidGit)')

args, varargs, varkw, defaults = inspect.getargspec(mod.eggs)
test(args == ['x', 'y'], 'mod.eggs args')
test(varargs == None, 'mod.eggs varargs')
test(varkw == None, 'mod.eggs varkw')
test(defaults == None, 'mod.eggs defaults')
test(inspect.formatargspec(args, varargs, varkw, defaults) ==
     '(x, y)', 'mod.eggs formatted argspec')
args, varargs, varkw, defaults = inspect.getargspec(mod.spam)
test(args == ['a', 'b', 'c', 'd', ['e', ['f']]], 'mod.spam args')
test(varargs == 'g', 'mod.spam varargs')
test(varkw == 'h', 'mod.spam varkw')
test(defaults == (3, (4, (5,))), 'mod.spam defaults')
test(inspect.formatargspec(args, varargs, varkw, defaults) ==
     '(a, b, c, d=3, (e, (f,))=(4, (5,)), *g, **h)',
     'mod.spam formatted argspec')

git.abuse(7, 8, 9)

istest(inspect.istraceback, 'git.ex[2]')
istest(inspect.isframe, 'mod.fr')

test(len(git.tr) == 3, 'trace() length')
test(git.tr[0][1:] == (TESTFN, 46, 'argue',
                       ['            self.tr = inspect.trace()\n'], 0),
     'trace() row 2')
test(git.tr[1][1:] == (TESTFN, 9, 'spam', ['    eggs(b + d, c + f)\n'], 0),
     'trace() row 2')
test(git.tr[2][1:] == (TESTFN, 18, 'eggs', ['    q = y / 0\n'], 0),
     'trace() row 3')

test(len(mod.st) >= 5, 'stack() length')
test(mod.st[0][1:] ==
     (TESTFN, 16, 'eggs', ['    st = inspect.stack()\n'], 0),
     'stack() row 1')
test(mod.st[1][1:] ==
     (TESTFN, 9, 'spam', ['    eggs(b + d, c + f)\n'], 0),
     'stack() row 2')
test(mod.st[2][1:] ==
     (TESTFN, 43, 'argue', ['            spam(a, b, c)\n'], 0),
     'stack() row 3')
test(mod.st[3][1:] ==
     (TESTFN, 39, 'abuse', ['        self.argue(a, b, c)\n'], 0),
     'stack() row 4')

args, varargs, varkw, locals = inspect.getargvalues(mod.fr)
test(args == ['x', 'y'], 'mod.fr args')
test(varargs == None, 'mod.fr varargs')
test(varkw == None, 'mod.fr varkw')
test(locals == {'x': 11, 'p': 11, 'y': 14}, 'mod.fr locals')
test(inspect.formatargvalues(args, varargs, varkw, locals) ==
     '(x=11, y=14)', 'mod.fr formatted argvalues')

args, varargs, varkw, locals = inspect.getargvalues(mod.fr.f_back)
test(args == ['a', 'b', 'c', 'd', ['e', ['f']]], 'mod.fr.f_back args')
test(varargs == 'g', 'mod.fr.f_back varargs')
test(varkw == 'h', 'mod.fr.f_back varkw')
test(inspect.formatargvalues(args, varargs, varkw, locals) ==
     '(a=7, b=8, c=9, d=3, (e=4, (f=5,)), *g=(), **h={})',
     'mod.fr.f_back formatted argvalues')

for fname in files_to_clean_up:
    try:
        os.unlink(fname)
    except:
        pass

# Test classic-class method resolution order.
class A:    pass
class B(A): pass
class C(A): pass
class D(B, C): pass

expected = (D, B, A, C)
got = inspect.getmro(D)
test(expected == got, "expected %r mro, got %r", expected, got)

# The same w/ new-class MRO.
class A(object):    pass
class B(A): pass
class C(A): pass
class D(B, C): pass

expected = (D, B, C, A, object)
got = inspect.getmro(D)
test(expected == got, "expected %r mro, got %r", expected, got)