9 examples of 'python check if object has attribute' in Python

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27def _hasattribute(obj, name):
28 try:
29 _getattribute(obj, name)
30 except AttributeError:
31 return False
32 else:
33 return True
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64def _hasattr(obj, attr_name):
65 # If possible, avoid retrieving the attribute as the object might run some
66 # lazy computation in it.
67 if attr_name in dir(obj):
68 return True
69 try:
70 getattr(obj, attr_name)
71 except AttributeError:
72 return False
73 else:
74 return True
53def hasattrs(obj, *attrs):
54 """hasattrs
55 Returns True if obj has all given attributes (implemented with hasattr())
56 :param obj: Object to check
57 :param *attrs: Attributes to check for on obj
58 """
59 for attr in attrs:
60 if not hasattr(obj, attr):
61 return False
62 return True
9def exists_and_truthy_getattr(obj, attr_name):
10 return bool(getattr(obj, attr_name, False))
74def assert_attr(self, obj, attr_name, type_of=None, value=EMPTY):
75 self.assertTrue(hasattr(obj, attr_name),
76 '%r has no attribute %s' % (obj, attr_name))
77 attr = getattr(obj, attr_name)
78 if type_of is not None:
79 self.assertTrue(isinstance(attr, type_of),
80 'Attribute %r is not %r type' % (attr, type_of))
81 if value is not EMPTY:
82 self.assertEqual(attr, value)
33def __check_attribute(ast_node):
34 attribute_name = ast_node.attr
35 if attribute_name not in STRING_AND_LIST_METHODS:
36 return False
37 return True
32def has_attributes(*attributes):
33 def test(obj):
34 for each in attributes:
35 if not hasattr(obj, each): return False
36 return True
37 return test
34def _hasattr(klass, attr):
35 try:
36 return any(attr in superklass.__dict__ for superklass in klass.__mro__)
37 except AttributeError:
38 # Old-style class
39 return hasattr(klass, attr)
24def test_hasattr(self):
25 attrs = (
26 "CONTENTSIZE_UNKNOWN",
27 "CONTENTSIZE_ERROR",
28 "COMPRESSION_RECOMMENDED_INPUT_SIZE",
29 "COMPRESSION_RECOMMENDED_OUTPUT_SIZE",
30 "DECOMPRESSION_RECOMMENDED_INPUT_SIZE",
31 "DECOMPRESSION_RECOMMENDED_OUTPUT_SIZE",
32 "MAGIC_NUMBER",
33 "FLUSH_BLOCK",
34 "FLUSH_FRAME",
35 "BLOCKSIZELOG_MAX",
36 "BLOCKSIZE_MAX",
37 "WINDOWLOG_MIN",
38 "WINDOWLOG_MAX",
39 "CHAINLOG_MIN",
40 "CHAINLOG_MAX",
41 "HASHLOG_MIN",
42 "HASHLOG_MAX",
43 "HASHLOG3_MAX",
44 "MINMATCH_MIN",
45 "MINMATCH_MAX",
46 "SEARCHLOG_MIN",
47 "SEARCHLOG_MAX",
48 "SEARCHLENGTH_MIN",
49 "SEARCHLENGTH_MAX",
50 "TARGETLENGTH_MIN",
51 "TARGETLENGTH_MAX",
52 "LDM_MINMATCH_MIN",
53 "LDM_MINMATCH_MAX",
54 "LDM_BUCKETSIZELOG_MAX",
55 "STRATEGY_FAST",
56 "STRATEGY_DFAST",
57 "STRATEGY_GREEDY",
58 "STRATEGY_LAZY",
59 "STRATEGY_LAZY2",
60 "STRATEGY_BTLAZY2",
61 "STRATEGY_BTOPT",
62 "STRATEGY_BTULTRA",
63 "STRATEGY_BTULTRA2",
64 "DICT_TYPE_AUTO",
65 "DICT_TYPE_RAWCONTENT",
66 "DICT_TYPE_FULLDICT",
67 )
68
69 for a in attrs:
70 self.assertTrue(hasattr(zstd, a), a)

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