def test_dict_access_and_modification(self):
# dicts for testing
d0 = {} # Empty dictionary
d1 = {1: 'Elephant'} # Single numeric key
d2 = {1: 'Elephant', 2: 'Mouse'} # Multiple numeric keys
# Construct NumDicts from dicts
n0 = NumDict()
n1 = NumDict(d1)
n2 = NumDict(d2)
# test __getitem__
self.assertEqual(n2[1], 'Elephant')
with self.assertRaises(KeyError):
n1['Mouse'] # key is not numeric
with self.assertRaises(KeyError):
n1.__getitem__('Mouse') # key is not numeric
with self.assertRaises(KeyError):
n1[None] # key does not exist
with self.assertRaises(KeyError):
n1.__getitem__(None) # key does not exist
# Test __setitem__
n3 = NumDict(n2)
self.assertEqual(n2, n3)
n3[2] = 'Frog'
self.assertNotEqual(n2, n3)
# Check None keys and numeric key conversion
n3['3'] = 'Armadillo'
n3[None] = 'Cockroach'
# Check long ints
n3[12390809518259081208909880312] = 'Squid'
n3['12390809518259081208909880312'] = 'Octopus'
self.assertEqual(n3[12390809518259081208909880312], 'Octopus')
with self.assertRaises(TypeError):
n3.__setitem__('Gorilla', 1) # key is not numeric
with self.assertRaises(TypeError):
n3['Chimpanzee'] = 1 # key is not numeric
with self.assertRaises(TypeError):
n3[(4, 1)] = 1 # key is not numeric
with self.assertRaises(TypeError):
n3[[1, 3, 4]] = 1 # key is not numeric and is not hashable
# Test __delitem__
del n3[3]
del n3[None]
with self.assertRaises(KeyError):
del n3[3] # already deleted
with self.assertRaises(KeyError):
n3.__delitem__(3) # already deleted
with self.assertRaises(KeyError):
del n3['Mouse'] # key would not exist, since it is not numeric
# Test clear
n3.clear()
self.assertEqual(n3, {})
# Test copy()
n2a = d2.copy()
self.assertEqual(n2, n2a)
n2b = n2.copy()
self.assertEqual(n2b, n2)
n2c = UserDict({1: 'Elephant', 2: 'Mouse'})
n2d = n2c.copy() # making a copy of a UserDict is special cased
self.assertEqual(n2c, n2d)
class MyNumDict(NumDict):
"""
subclass Numdict for testing
"""
def display(self):
"""
add a method to subclass to differentiate from superclass
"""
print('MyNumDict:', self)
m2 = MyNumDict(n2)
m2a = m2.copy()
self.assertEqual(m2a, m2)
m2[1] = 'Frog'
self.assertNotEqual(m2a, m2)
# Test keys, items, values
self.assertEqual(sorted(n2.keys()), sorted(d2.keys()))
self.assertEqual(sorted(n2.items()), sorted(d2.items()))
self.assertEqual(sorted(n2.values()), sorted(d2.values()))
# Test "in".
for i in n2:
self.assertIn(i, n2)
self.assertEqual(i in n1, i in d1)
self.assertEqual(i in n0, i in d0)
self.assertFalse(None in n2)
self.assertEqual(None in n2, None in d2)
d2[None] = 'Cow'
n2[None] = d2[None]
self.assertTrue(None in n2)
self.assertEqual(None in n2, None in d2)
self.assertEqual(n2.has_key(None), None in d2)
if not PY3:
self.assertEqual(n2.has_key(None), d2.has_key(None))
self.assertFalse('Penguin' in n2)
# Test update
t = NumDict()
t.update(d2)
self.assertEqual(t, n2)
# Test get
for i in n2:
self.assertEqual(n2.get(i), n2[i])
self.assertEqual(n1.get(i), d1.get(i))
self.assertEqual(n0.get(i), d0.get(i))
for i in ['purple', None, 12312301924091284, 23]:
self.assertEqual(n2.get(i), d2.get(i), i)
with self.assertRaises(AssertionError):
i = '1'
self.assertEqual(n2.get(i), d2.get(i), i) # d2 expects string key which does not exist
# Test "in" iteration.
n2b = n2
for i in range(20):
n2[i] = str(i)
n2b[str(i)] = str(i)
self.assertEqual(n2, n2b)
ikeys = []
for k in n2:
ikeys.append(k)
self.assertEqual(set(ikeys), set(n2.keys()))
# Test setdefault
x = 1
t = NumDict()
self.assertEqual(t.setdefault(x, 42), 42)
self.assertEqual(t.setdefault(x, '42'), 42)
self.assertNotEqual(t.setdefault(x, 42), '42')
self.assertNotEqual(t.setdefault(x, '42'), '42')
self.assertIn(x, t)
self.assertEqual(t.setdefault(x, 23), 42)
self.assertEqual(t.setdefault(x, '23'), 42)
self.assertNotEqual(t.setdefault(x, 23), '42')
self.assertNotEqual(t.setdefault(x, '23'), '42')
self.assertIn(x, t)
# Test pop
x = 1
t = NumDict({x: 42})
self.assertEqual(t.pop(x), 42)
self.assertRaises(KeyError, t.pop, x)
self.assertEqual(t.pop(x, 1), 1)
t[x] = 42
self.assertEqual(t.pop(x, 1), 42)
# Test popitem
x = 1
t = NumDict({x: 42})
self.assertEqual(t.popitem(), (x, 42))
self.assertRaises(KeyError, t.popitem)
