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# coding: utf-8
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"""Tests for IPython.lib.pretty."""
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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 collections import Counter, defaultdict, deque, OrderedDict
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import types
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import string
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import unittest
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import nose.tools as nt
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from IPython.lib import pretty
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from IPython.testing.decorators import skip_without
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from io import StringIO
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class MyList(object):
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def __init__(self, content):
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self.content = content
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def _repr_pretty_(self, p, cycle):
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if cycle:
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p.text("MyList(...)")
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else:
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with p.group(3, "MyList(", ")"):
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for (i, child) in enumerate(self.content):
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if i:
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p.text(",")
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p.breakable()
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else:
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p.breakable("")
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p.pretty(child)
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class MyDict(dict):
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def _repr_pretty_(self, p, cycle):
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p.text("MyDict(...)")
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class MyObj(object):
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def somemethod(self):
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pass
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class Dummy1(object):
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def _repr_pretty_(self, p, cycle):
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p.text("Dummy1(...)")
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class Dummy2(Dummy1):
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_repr_pretty_ = None
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class NoModule(object):
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pass
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NoModule.__module__ = None
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class Breaking(object):
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def _repr_pretty_(self, p, cycle):
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with p.group(4,"TG: ",":"):
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p.text("Breaking(")
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p.break_()
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p.text(")")
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class BreakingRepr(object):
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def __repr__(self):
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return "Breaking(\n)"
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class BreakingReprParent(object):
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def _repr_pretty_(self, p, cycle):
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with p.group(4,"TG: ",":"):
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p.pretty(BreakingRepr())
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class BadRepr(object):
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def __repr__(self):
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return 1/0
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def test_indentation():
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"""Test correct indentation in groups"""
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count = 40
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gotoutput = pretty.pretty(MyList(range(count)))
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expectedoutput = "MyList(\n" + ",\n".join(" %d" % i for i in range(count)) + ")"
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nt.assert_equal(gotoutput, expectedoutput)
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def test_dispatch():
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"""
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Test correct dispatching: The _repr_pretty_ method for MyDict
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must be found before the registered printer for dict.
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"""
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gotoutput = pretty.pretty(MyDict())
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expectedoutput = "MyDict(...)"
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nt.assert_equal(gotoutput, expectedoutput)
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def test_callability_checking():
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"""
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Test that the _repr_pretty_ method is tested for callability and skipped if
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not.
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"""
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gotoutput = pretty.pretty(Dummy2())
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expectedoutput = "Dummy1(...)"
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nt.assert_equal(gotoutput, expectedoutput)
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def test_sets():
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"""
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Test that set and frozenset use Python 3 formatting.
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"""
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objects = [set(), frozenset(), set([1]), frozenset([1]), set([1, 2]),
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frozenset([1, 2]), set([-1, -2, -3])]
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expected = ['set()', 'frozenset()', '{1}', 'frozenset({1})', '{1, 2}',
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'frozenset({1, 2})', '{-3, -2, -1}']
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for obj, expected_output in zip(objects, expected):
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got_output = pretty.pretty(obj)
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yield nt.assert_equal, got_output, expected_output
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@skip_without('xxlimited')
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def test_pprint_heap_allocated_type():
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"""
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Test that pprint works for heap allocated types.
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"""
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import xxlimited
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output = pretty.pretty(xxlimited.Null)
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nt.assert_equal(output, 'xxlimited.Null')
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def test_pprint_nomod():
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"""
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Test that pprint works for classes with no __module__.
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"""
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output = pretty.pretty(NoModule)
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nt.assert_equal(output, 'NoModule')
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def test_pprint_break():
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"""
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Test that p.break_ produces expected output
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"""
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output = pretty.pretty(Breaking())
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expected = "TG: Breaking(\n ):"
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nt.assert_equal(output, expected)
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def test_pprint_break_repr():
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"""
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Test that p.break_ is used in repr
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"""
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output = pretty.pretty(BreakingReprParent())
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expected = "TG: Breaking(\n ):"
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nt.assert_equal(output, expected)
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def test_bad_repr():
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"""Don't catch bad repr errors"""
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with nt.assert_raises(ZeroDivisionError):
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pretty.pretty(BadRepr())
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class BadException(Exception):
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def __str__(self):
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return -1
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class ReallyBadRepr(object):
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__module__ = 1
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@property
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def __class__(self):
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raise ValueError("I am horrible")
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def __repr__(self):
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raise BadException()
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def test_really_bad_repr():
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with nt.assert_raises(BadException):
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pretty.pretty(ReallyBadRepr())
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class SA(object):
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pass
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class SB(SA):
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pass
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class TestsPretty(unittest.TestCase):
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def test_super_repr(self):
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# "<super: module_name.SA, None>"
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output = pretty.pretty(super(SA))
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self.assertRegex(output, r"<super: \S+.SA, None>")
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# "<super: module_name.SA, <module_name.SB at 0x...>>"
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sb = SB()
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output = pretty.pretty(super(SA, sb))
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self.assertRegex(output, r"<super: \S+.SA,\s+<\S+.SB at 0x\S+>>")
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def test_long_list(self):
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lis = list(range(10000))
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p = pretty.pretty(lis)
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last2 = p.rsplit('\n', 2)[-2:]
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self.assertEqual(last2, [' 999,', ' ...]'])
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def test_long_set(self):
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s = set(range(10000))
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p = pretty.pretty(s)
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last2 = p.rsplit('\n', 2)[-2:]
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self.assertEqual(last2, [' 999,', ' ...}'])
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def test_long_tuple(self):
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tup = tuple(range(10000))
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p = pretty.pretty(tup)
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last2 = p.rsplit('\n', 2)[-2:]
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self.assertEqual(last2, [' 999,', ' ...)'])
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def test_long_dict(self):
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d = { n:n for n in range(10000) }
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p = pretty.pretty(d)
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last2 = p.rsplit('\n', 2)[-2:]
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self.assertEqual(last2, [' 999: 999,', ' ...}'])
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def test_unbound_method(self):
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output = pretty.pretty(MyObj.somemethod)
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self.assertIn('MyObj.somemethod', output)
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class MetaClass(type):
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def __new__(cls, name):
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return type.__new__(cls, name, (object,), {'name': name})
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def __repr__(self):
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return "[CUSTOM REPR FOR CLASS %s]" % self.name
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ClassWithMeta = MetaClass('ClassWithMeta')
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def test_metaclass_repr():
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output = pretty.pretty(ClassWithMeta)
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nt.assert_equal(output, "[CUSTOM REPR FOR CLASS ClassWithMeta]")
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def test_unicode_repr():
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u = u"üniçodé"
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ustr = u
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class C(object):
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def __repr__(self):
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return ustr
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c = C()
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p = pretty.pretty(c)
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nt.assert_equal(p, u)
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p = pretty.pretty([c])
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nt.assert_equal(p, u'[%s]' % u)
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def test_basic_class():
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def type_pprint_wrapper(obj, p, cycle):
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if obj is MyObj:
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type_pprint_wrapper.called = True
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return pretty._type_pprint(obj, p, cycle)
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type_pprint_wrapper.called = False
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stream = StringIO()
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printer = pretty.RepresentationPrinter(stream)
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printer.type_pprinters[type] = type_pprint_wrapper
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printer.pretty(MyObj)
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printer.flush()
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output = stream.getvalue()
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nt.assert_equal(output, '%s.MyObj' % __name__)
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nt.assert_true(type_pprint_wrapper.called)
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def test_collections_defaultdict():
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# Create defaultdicts with cycles
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a = defaultdict()
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a.default_factory = a
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b = defaultdict(list)
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b['key'] = b
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# Dictionary order cannot be relied on, test against single keys.
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cases = [
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(defaultdict(list), 'defaultdict(list, {})'),
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(defaultdict(list, {'key': '-' * 50}),
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"defaultdict(list,\n"
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" {'key': '--------------------------------------------------'})"),
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(a, 'defaultdict(defaultdict(...), {})'),
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(b, "defaultdict(list, {'key': defaultdict(...)})"),
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]
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for obj, expected in cases:
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nt.assert_equal(pretty.pretty(obj), expected)
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def test_collections_ordereddict():
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# Create OrderedDict with cycle
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a = OrderedDict()
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a['key'] = a
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cases = [
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(OrderedDict(), 'OrderedDict()'),
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(OrderedDict((i, i) for i in range(1000, 1010)),
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'OrderedDict([(1000, 1000),\n'
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' (1001, 1001),\n'
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' (1002, 1002),\n'
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' (1003, 1003),\n'
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' (1004, 1004),\n'
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' (1005, 1005),\n'
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' (1006, 1006),\n'
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' (1007, 1007),\n'
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' (1008, 1008),\n'
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' (1009, 1009)])'),
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(a, "OrderedDict([('key', OrderedDict(...))])"),
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]
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for obj, expected in cases:
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nt.assert_equal(pretty.pretty(obj), expected)
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def test_collections_deque():
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# Create deque with cycle
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a = deque()
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a.append(a)
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cases = [
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(deque(), 'deque([])'),
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(deque(i for i in range(1000, 1020)),
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'deque([1000,\n'
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' 1001,\n'
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' 1002,\n'
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' 1003,\n'
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' 1004,\n'
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' 1005,\n'
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' 1006,\n'
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' 1007,\n'
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' 1008,\n'
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' 1009,\n'
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' 1010,\n'
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' 1011,\n'
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' 1012,\n'
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' 1013,\n'
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' 1014,\n'
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' 1015,\n'
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' 1016,\n'
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' 1017,\n'
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' 1018,\n'
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' 1019])'),
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(a, 'deque([deque(...)])'),
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]
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for obj, expected in cases:
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nt.assert_equal(pretty.pretty(obj), expected)
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def test_collections_counter():
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class MyCounter(Counter):
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pass
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cases = [
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(Counter(), 'Counter()'),
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(Counter(a=1), "Counter({'a': 1})"),
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(MyCounter(a=1), "MyCounter({'a': 1})"),
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]
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for obj, expected in cases:
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nt.assert_equal(pretty.pretty(obj), expected)
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def test_mappingproxy():
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MP = types.MappingProxyType
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underlying_dict = {}
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mp_recursive = MP(underlying_dict)
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underlying_dict[2] = mp_recursive
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underlying_dict[3] = underlying_dict
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cases = [
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(MP({}), "mappingproxy({})"),
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(MP({None: MP({})}), "mappingproxy({None: mappingproxy({})})"),
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(MP({k: k.upper() for k in string.ascii_lowercase}),
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"mappingproxy({'a': 'A',\n"
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" 'b': 'B',\n"
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" 'c': 'C',\n"
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" 'd': 'D',\n"
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" 'e': 'E',\n"
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" 'f': 'F',\n"
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" 'g': 'G',\n"
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" 'h': 'H',\n"
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" 'i': 'I',\n"
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" 'j': 'J',\n"
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" 'k': 'K',\n"
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" 'l': 'L',\n"
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" 'm': 'M',\n"
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" 'n': 'N',\n"
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" 'o': 'O',\n"
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" 'p': 'P',\n"
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" 'q': 'Q',\n"
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" 'r': 'R',\n"
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" 's': 'S',\n"
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" 't': 'T',\n"
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" 'u': 'U',\n"
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" 'v': 'V',\n"
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" 'w': 'W',\n"
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" 'x': 'X',\n"
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" 'y': 'Y',\n"
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" 'z': 'Z'})"),
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(mp_recursive, "mappingproxy({2: {...}, 3: {2: {...}, 3: {...}}})"),
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(underlying_dict,
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"{2: mappingproxy({2: {...}, 3: {...}}), 3: {...}}"),
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]
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for obj, expected in cases:
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nt.assert_equal(pretty.pretty(obj), expected)
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def test_function_pretty():
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"Test pretty print of function"
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# posixpath is a pure python module, its interface is consistent
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# across Python distributions
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import posixpath
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nt.assert_equal(pretty.pretty(posixpath.join), '<function posixpath.join(a, *p)>')
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# custom function
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def meaning_of_life(question=None):
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if question:
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return 42
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return "Don't panic"
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nt.assert_in('meaning_of_life(question=None)', pretty.pretty(meaning_of_life))
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class OrderedCounter(Counter, OrderedDict):
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'Counter that remembers the order elements are first encountered'
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def __repr__(self):
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return '%s(%r)' % (self.__class__.__name__, OrderedDict(self))
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def __reduce__(self):
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return self.__class__, (OrderedDict(self),)
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class MySet(set): # Override repr of a basic type
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def __repr__(self):
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return 'mine'
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def test_custom_repr():
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"""A custom repr should override a pretty printer for a parent type"""
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oc = OrderedCounter("abracadabra")
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nt.assert_in("OrderedCounter(OrderedDict", pretty.pretty(oc))
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nt.assert_equal(pretty.pretty(MySet()), 'mine')
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