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"""Tests for the object inspection functionality.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from inspect import Signature, Parameter
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import os
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import re
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import sys
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import nose.tools as nt
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from .. import oinspect
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from IPython.core.magic import (Magics, magics_class, line_magic,
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cell_magic, line_cell_magic,
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register_line_magic, register_cell_magic,
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register_line_cell_magic)
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from decorator import decorator
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from IPython import get_ipython
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from IPython.testing.tools import AssertPrints, AssertNotPrints
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from IPython.utils.path import compress_user
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#-----------------------------------------------------------------------------
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# Globals and constants
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#-----------------------------------------------------------------------------
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inspector = oinspect.Inspector()
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ip = get_ipython()
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#-----------------------------------------------------------------------------
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# Local utilities
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#-----------------------------------------------------------------------------
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# WARNING: since this test checks the line number where a function is
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# defined, if any code is inserted above, the following line will need to be
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# updated. Do NOT insert any whitespace between the next line and the function
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# definition below.
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THIS_LINE_NUMBER = 41 # Put here the actual number of this line
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from unittest import TestCase
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class Test(TestCase):
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def test_find_source_lines(self):
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self.assertEqual(oinspect.find_source_lines(Test.test_find_source_lines),
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THIS_LINE_NUMBER+6)
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# A couple of utilities to ensure these tests work the same from a source or a
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# binary install
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def pyfile(fname):
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return os.path.normcase(re.sub('.py[co]$', '.py', fname))
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def match_pyfiles(f1, f2):
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nt.assert_equal(pyfile(f1), pyfile(f2))
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def test_find_file():
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match_pyfiles(oinspect.find_file(test_find_file), os.path.abspath(__file__))
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def test_find_file_decorated1():
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@decorator
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def noop1(f):
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def wrapper(*a, **kw):
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return f(*a, **kw)
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return wrapper
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@noop1
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def f(x):
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"My docstring"
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match_pyfiles(oinspect.find_file(f), os.path.abspath(__file__))
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nt.assert_equal(f.__doc__, "My docstring")
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def test_find_file_decorated2():
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@decorator
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def noop2(f, *a, **kw):
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return f(*a, **kw)
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@noop2
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@noop2
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@noop2
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def f(x):
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"My docstring 2"
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match_pyfiles(oinspect.find_file(f), os.path.abspath(__file__))
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nt.assert_equal(f.__doc__, "My docstring 2")
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def test_find_file_magic():
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run = ip.find_line_magic('run')
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nt.assert_not_equal(oinspect.find_file(run), None)
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# A few generic objects we can then inspect in the tests below
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class Call(object):
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"""This is the class docstring."""
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def __init__(self, x, y=1):
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"""This is the constructor docstring."""
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def __call__(self, *a, **kw):
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"""This is the call docstring."""
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def method(self, x, z=2):
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"""Some method's docstring"""
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class HasSignature(object):
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"""This is the class docstring."""
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__signature__ = Signature([Parameter('test', Parameter.POSITIONAL_OR_KEYWORD)])
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def __init__(self, *args):
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"""This is the init docstring"""
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class SimpleClass(object):
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def method(self, x, z=2):
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"""Some method's docstring"""
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class OldStyle:
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"""An old-style class for testing."""
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pass
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def f(x, y=2, *a, **kw):
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"""A simple function."""
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def g(y, z=3, *a, **kw):
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pass # no docstring
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@register_line_magic
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def lmagic(line):
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"A line magic"
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@register_cell_magic
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def cmagic(line, cell):
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"A cell magic"
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@register_line_cell_magic
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def lcmagic(line, cell=None):
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"A line/cell magic"
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@magics_class
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class SimpleMagics(Magics):
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@line_magic
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def Clmagic(self, cline):
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"A class-based line magic"
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@cell_magic
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def Ccmagic(self, cline, ccell):
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"A class-based cell magic"
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@line_cell_magic
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def Clcmagic(self, cline, ccell=None):
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"A class-based line/cell magic"
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class Awkward(object):
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def __getattr__(self, name):
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raise Exception(name)
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class NoBoolCall:
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"""
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callable with `__bool__` raising should still be inspect-able.
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"""
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def __call__(self):
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"""does nothing"""
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pass
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def __bool__(self):
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"""just raise NotImplemented"""
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raise NotImplementedError('Must be implemented')
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class SerialLiar(object):
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"""Attribute accesses always get another copy of the same class.
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unittest.mock.call does something similar, but it's not ideal for testing
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as the failure mode is to eat all your RAM. This gives up after 10k levels.
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"""
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def __init__(self, max_fibbing_twig, lies_told=0):
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if lies_told > 10000:
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raise RuntimeError('Nose too long, honesty is the best policy')
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self.max_fibbing_twig = max_fibbing_twig
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self.lies_told = lies_told
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max_fibbing_twig[0] = max(max_fibbing_twig[0], lies_told)
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def __getattr__(self, item):
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return SerialLiar(self.max_fibbing_twig, self.lies_told + 1)
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#-----------------------------------------------------------------------------
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# Tests
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#-----------------------------------------------------------------------------
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def test_info():
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"Check that Inspector.info fills out various fields as expected."
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i = inspector.info(Call, oname='Call')
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nt.assert_equal(i['type_name'], 'type')
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expted_class = str(type(type)) # <class 'type'> (Python 3) or <type 'type'>
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nt.assert_equal(i['base_class'], expted_class)
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nt.assert_regex(i['string_form'], "<class 'IPython.core.tests.test_oinspect.Call'( at 0x[0-9a-f]{1,9})?>")
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fname = __file__
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if fname.endswith(".pyc"):
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fname = fname[:-1]
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# case-insensitive comparison needed on some filesystems
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# e.g. Windows:
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nt.assert_equal(i['file'].lower(), compress_user(fname).lower())
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nt.assert_equal(i['definition'], None)
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nt.assert_equal(i['docstring'], Call.__doc__)
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nt.assert_equal(i['source'], None)
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nt.assert_true(i['isclass'])
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nt.assert_equal(i['init_definition'], "Call(x, y=1)")
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nt.assert_equal(i['init_docstring'], Call.__init__.__doc__)
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i = inspector.info(Call, detail_level=1)
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nt.assert_not_equal(i['source'], None)
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nt.assert_equal(i['docstring'], None)
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c = Call(1)
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c.__doc__ = "Modified instance docstring"
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i = inspector.info(c)
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nt.assert_equal(i['type_name'], 'Call')
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nt.assert_equal(i['docstring'], "Modified instance docstring")
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nt.assert_equal(i['class_docstring'], Call.__doc__)
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nt.assert_equal(i['init_docstring'], Call.__init__.__doc__)
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nt.assert_equal(i['call_docstring'], Call.__call__.__doc__)
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def test_class_signature():
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info = inspector.info(HasSignature, 'HasSignature')
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nt.assert_equal(info['init_definition'], "HasSignature(test)")
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nt.assert_equal(info['init_docstring'], HasSignature.__init__.__doc__)
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def test_info_awkward():
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# Just test that this doesn't throw an error.
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inspector.info(Awkward())
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def test_bool_raise():
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inspector.info(NoBoolCall())
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def test_info_serialliar():
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fib_tracker = [0]
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inspector.info(SerialLiar(fib_tracker))
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# Nested attribute access should be cut off at 100 levels deep to avoid
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# infinite loops: https://github.com/ipython/ipython/issues/9122
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nt.assert_less(fib_tracker[0], 9000)
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def test_calldef_none():
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# We should ignore __call__ for all of these.
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for obj in [f, SimpleClass().method, any, str.upper]:
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print(obj)
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i = inspector.info(obj)
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nt.assert_is(i['call_def'], None)
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def f_kwarg(pos, *, kwonly):
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pass
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def test_definition_kwonlyargs():
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i = inspector.info(f_kwarg, oname='f_kwarg') # analysis:ignore
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nt.assert_equal(i['definition'], "f_kwarg(pos, *, kwonly)")
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def test_getdoc():
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class A(object):
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"""standard docstring"""
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pass
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class B(object):
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"""standard docstring"""
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def getdoc(self):
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return "custom docstring"
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class C(object):
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"""standard docstring"""
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def getdoc(self):
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return None
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a = A()
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b = B()
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c = C()
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nt.assert_equal(oinspect.getdoc(a), "standard docstring")
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nt.assert_equal(oinspect.getdoc(b), "custom docstring")
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nt.assert_equal(oinspect.getdoc(c), "standard docstring")
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def test_empty_property_has_no_source():
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i = inspector.info(property(), detail_level=1)
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nt.assert_is(i['source'], None)
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def test_property_sources():
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import posixpath
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# A simple adder whose source and signature stays
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# the same across Python distributions
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def simple_add(a, b):
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"Adds two numbers"
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return a + b
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class A(object):
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@property
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def foo(self):
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return 'bar'
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foo = foo.setter(lambda self, v: setattr(self, 'bar', v))
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dname = property(posixpath.dirname)
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adder = property(simple_add)
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i = inspector.info(A.foo, detail_level=1)
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nt.assert_in('def foo(self):', i['source'])
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nt.assert_in('lambda self, v:', i['source'])
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i = inspector.info(A.dname, detail_level=1)
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nt.assert_in('def dirname(p)', i['source'])
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i = inspector.info(A.adder, detail_level=1)
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nt.assert_in('def simple_add(a, b)', i['source'])
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def test_property_docstring_is_in_info_for_detail_level_0():
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class A(object):
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@property
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def foobar(self):
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"""This is `foobar` property."""
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pass
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ip.user_ns['a_obj'] = A()
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nt.assert_equal(
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'This is `foobar` property.',
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ip.object_inspect('a_obj.foobar', detail_level=0)['docstring'])
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ip.user_ns['a_cls'] = A
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nt.assert_equal(
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'This is `foobar` property.',
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ip.object_inspect('a_cls.foobar', detail_level=0)['docstring'])
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def test_pdef():
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# See gh-1914
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def foo(): pass
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inspector.pdef(foo, 'foo')
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def test_pinfo_nonascii():
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# See gh-1177
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from . import nonascii2
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ip.user_ns['nonascii2'] = nonascii2
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ip._inspect('pinfo', 'nonascii2', detail_level=1)
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def test_pinfo_docstring_no_source():
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"""Docstring should be included with detail_level=1 if there is no source"""
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with AssertPrints('Docstring:'):
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ip._inspect('pinfo', 'str.format', detail_level=0)
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with AssertPrints('Docstring:'):
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ip._inspect('pinfo', 'str.format', detail_level=1)
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def test_pinfo_no_docstring_if_source():
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"""Docstring should not be included with detail_level=1 if source is found"""
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def foo():
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"""foo has a docstring"""
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ip.user_ns['foo'] = foo
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with AssertPrints('Docstring:'):
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ip._inspect('pinfo', 'foo', detail_level=0)
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with AssertPrints('Source:'):
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ip._inspect('pinfo', 'foo', detail_level=1)
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with AssertNotPrints('Docstring:'):
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ip._inspect('pinfo', 'foo', detail_level=1)
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def test_pinfo_docstring_if_detail_and_no_source():
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""" Docstring should be displayed if source info not available """
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obj_def = '''class Foo(object):
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""" This is a docstring for Foo """
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def bar(self):
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""" This is a docstring for Foo.bar """
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pass
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'''
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ip.run_cell(obj_def)
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ip.run_cell('foo = Foo()')
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with AssertNotPrints("Source:"):
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with AssertPrints('Docstring:'):
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ip._inspect('pinfo', 'foo', detail_level=0)
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with AssertPrints('Docstring:'):
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ip._inspect('pinfo', 'foo', detail_level=1)
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with AssertPrints('Docstring:'):
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ip._inspect('pinfo', 'foo.bar', detail_level=0)
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with AssertNotPrints('Docstring:'):
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with AssertPrints('Source:'):
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ip._inspect('pinfo', 'foo.bar', detail_level=1)
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def test_pinfo_magic():
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with AssertPrints('Docstring:'):
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ip._inspect('pinfo', 'lsmagic', detail_level=0)
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with AssertPrints('Source:'):
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ip._inspect('pinfo', 'lsmagic', detail_level=1)
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def test_init_colors():
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# ensure colors are not present in signature info
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info = inspector.info(HasSignature)
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init_def = info['init_definition']
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nt.assert_not_in('[0m', init_def)
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def test_builtin_init():
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info = inspector.info(list)
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init_def = info['init_definition']
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# Python < 3.4 can't get init definition from builtins,
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# but still exercise the inspection in case of error-raising bugs.
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if sys.version_info >= (3,4):
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nt.assert_is_not_none(init_def)
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