Cleanup some of the skip-if decorators.

Initially push to know what needed to finish
`https://github.com/ipython/ipython/pull/9491`.
Ended up cleaning a few tests, and imports.

IPython/core/tests/test_run.py

@@ -19,7 +19,6 b' import os'
 from os.path import join as pjoin
 import random
 import sys
-import tempfile
 import textwrap
 import unittest
 
@@ -209,7 +208,7 b' class TestMagicRunPass(tt.TempFileMixin):'
     def test_run_profile( self ):
         """Test that the option -p, which invokes the profiler, do not
         crash by invoking execfile"""
-        _ip = get_ipython()
+        get_ipython()
         self.run_tmpfile_p()
 
 
@@ -368,7 +367,6 b' tclass.py: deleting object: C-third'
         with tt.AssertNotPrints('SystemExit'):
             _ip.magic('run -e %s' % self.fname)
 
-    @dec.skip_without('nbformat')  # Requires jsonschema
     def test_run_nb(self):
         """Test %run notebook.ipynb"""
         from nbformat import v4, writes

IPython/core/tests/test_shellapp.py

@@ -19,7 +19,6 b' import unittest'
 
 from IPython.testing import decorators as dec
 from IPython.testing import tools as tt
-from IPython.utils.py3compat import PY3
 
 sqlite_err_maybe = dec.module_not_available('sqlite3')
 SQLITE_NOT_AVAILABLE_ERROR = ('WARNING: IPython History requires SQLite,'
@@ -55,14 +54,3 b' class TestFileToRun(unittest.TestCase, tt.TempFileMixin):'
         out, err = tt.ipexec(self.fname, options=['-i'],
                            commands=['"__file__" in globals()', 'exit()'])
         self.assertIn("False", out)
-
-    @dec.skip_win32
-    @dec.skipif(PY3)
-    def test_py_script_file_compiler_directive(self):
-        """Test `__future__` compiler directives with `ipython -i file.py`"""
-        src = "from __future__ import division\n"
-        self.mktmp(src)
-
-        out, err = tt.ipexec(self.fname, options=['-i'],
-                           commands=['type(1/2)', 'exit()'])
-        self.assertIn('float', out)

IPython/lib/tests/test_pretty.py

@@ -7,13 +7,13 b''
 from __future__ import print_function
 
 from collections import Counter, defaultdict, deque, OrderedDict
-import types, string, ctypes
+import types, string
 
 import nose.tools as nt
 
 from IPython.lib import pretty
-from IPython.testing.decorators import (skip_without, py2_only, py3_only,
-                                        cpython2_only)
+from IPython.testing.decorators import (skip_without, py2_only, py3_only)
+                                        
 from IPython.utils.py3compat import PY3, unicode_to_str
 
 if PY3:
@@ -161,7 +161,7 b' def test_pprint_break_repr():'
 def test_bad_repr():
     """Don't catch bad repr errors"""
     with nt.assert_raises(ZeroDivisionError):
-        output = pretty.pretty(BadRepr())
+        pretty.pretty(BadRepr())
 
 class BadException(Exception):
     def __str__(self):
@@ -178,7 +178,7 b' class ReallyBadRepr(object):'
 
 def test_really_bad_repr():
     with nt.assert_raises(BadException):
-        output = pretty.pretty(ReallyBadRepr())
+        pretty.pretty(ReallyBadRepr())
 
 
 class SA(object):
@@ -485,52 +485,3 b' def test_mappingproxy():'
     ]
     for obj, expected in cases:
         nt.assert_equal(pretty.pretty(obj), expected)
-
-@cpython2_only # In PyPy, types.DictProxyType is dict
-def test_dictproxy():
-    # This is the dictproxy constructor itself from the Python API,
-    DP = ctypes.pythonapi.PyDictProxy_New
-    DP.argtypes, DP.restype = (ctypes.py_object,), ctypes.py_object
-
-    underlying_dict = {}
-    mp_recursive = DP(underlying_dict)
-    underlying_dict[0] = mp_recursive
-    underlying_dict[-3] = underlying_dict
-
-    cases = [
-        (DP({}), "dict_proxy({})"),
-        (DP({None: DP({})}), "dict_proxy({None: dict_proxy({})})"),
-        (DP({k: k.lower() for k in string.ascii_uppercase}),
-         "dict_proxy({'A': 'a',\n"
-         "            'B': 'b',\n"
-         "            'C': 'c',\n"
-         "            'D': 'd',\n"
-         "            'E': 'e',\n"
-         "            'F': 'f',\n"
-         "            'G': 'g',\n"
-         "            'H': 'h',\n"
-         "            'I': 'i',\n"
-         "            'J': 'j',\n"
-         "            'K': 'k',\n"
-         "            'L': 'l',\n"
-         "            'M': 'm',\n"
-         "            'N': 'n',\n"
-         "            'O': 'o',\n"
-         "            'P': 'p',\n"
-         "            'Q': 'q',\n"
-         "            'R': 'r',\n"
-         "            'S': 's',\n"
-         "            'T': 't',\n"
-         "            'U': 'u',\n"
-         "            'V': 'v',\n"
-         "            'W': 'w',\n"
-         "            'X': 'x',\n"
-         "            'Y': 'y',\n"
-         "            'Z': 'z'})"),
-        (mp_recursive, "dict_proxy({-3: {-3: {...}, 0: {...}}, 0: {...}})"),
-    ]
-    for obj, expected in cases:
-        nt.assert_is_instance(obj, types.DictProxyType) # Meta-test
-        nt.assert_equal(pretty.pretty(obj), expected)
-    nt.assert_equal(pretty.pretty(underlying_dict),
-                    "{-3: {...}, 0: dict_proxy({-3: {...}, 0: {...}})}")

IPython/testing/decorators.py

@@ -336,7 +336,6 b" skip_known_failure = knownfailureif(True,'This test is known to fail')"
 known_failure_py3 = knownfailureif(sys.version_info[0] >= 3, 
                                     'This test is known to fail on Python 3.')
 
-cpython2_only = skipif(PY3 or PYPY, "This test only runs on CPython 2.")
 py2_only = skipif(PY3, "This test only runs on Python 2.")
 py3_only = skipif(PY2, "This test only runs on Python 3.")