##// END OF EJS Templates
Merge pull request #10046 from ivanov/fix-tab-completion...
Matthias Bussonnier -
r23444:3c154253 merge
parent child Browse files
Show More
@@ -1,80 +1,83 b''
1 # encoding: utf-8
1 # encoding: utf-8
2 """A fancy version of Python's builtin :func:`dir` function.
2 """A fancy version of Python's builtin :func:`dir` function.
3 """
3 """
4
4
5 # Copyright (c) IPython Development Team.
5 # Copyright (c) IPython Development Team.
6 # Distributed under the terms of the Modified BSD License.
6 # Distributed under the terms of the Modified BSD License.
7
7
8 import inspect
8 import inspect
9
9
10
10
11 def safe_hasattr(obj, attr):
11 def safe_hasattr(obj, attr):
12 """In recent versions of Python, hasattr() only catches AttributeError.
12 """In recent versions of Python, hasattr() only catches AttributeError.
13 This catches all errors.
13 This catches all errors.
14 """
14 """
15 try:
15 try:
16 getattr(obj, attr)
16 getattr(obj, attr)
17 return True
17 return True
18 except:
18 except:
19 return False
19 return False
20
20
21
21
22 def dir2(obj):
22 def dir2(obj):
23 """dir2(obj) -> list of strings
23 """dir2(obj) -> list of strings
24
24
25 Extended version of the Python builtin dir(), which does a few extra
25 Extended version of the Python builtin dir(), which does a few extra
26 checks.
26 checks.
27
27
28 This version is guaranteed to return only a list of true strings, whereas
28 This version is guaranteed to return only a list of true strings, whereas
29 dir() returns anything that objects inject into themselves, even if they
29 dir() returns anything that objects inject into themselves, even if they
30 are later not really valid for attribute access (many extension libraries
30 are later not really valid for attribute access (many extension libraries
31 have such bugs).
31 have such bugs).
32 """
32 """
33
33
34 # Start building the attribute list via dir(), and then complete it
34 # Start building the attribute list via dir(), and then complete it
35 # with a few extra special-purpose calls.
35 # with a few extra special-purpose calls.
36
36
37 try:
37 try:
38 words = set(dir(obj))
38 words = set(dir(obj))
39 except Exception:
39 except Exception:
40 # TypeError: dir(obj) does not return a list
40 # TypeError: dir(obj) does not return a list
41 words = set()
41 words = set()
42
42
43 if safe_hasattr(obj, '__class__'):
44 words |= set(dir(obj.__class__))
45
43 # filter out non-string attributes which may be stuffed by dir() calls
46 # filter out non-string attributes which may be stuffed by dir() calls
44 # and poor coding in third-party modules
47 # and poor coding in third-party modules
45
48
46 words = [w for w in words if isinstance(w, str)]
49 words = [w for w in words if isinstance(w, str)]
47 return sorted(words)
50 return sorted(words)
48
51
49
52
50 def get_real_method(obj, name):
53 def get_real_method(obj, name):
51 """Like getattr, but with a few extra sanity checks:
54 """Like getattr, but with a few extra sanity checks:
52
55
53 - If obj is a class, ignore its methods
56 - If obj is a class, ignore its methods
54 - Check if obj is a proxy that claims to have all attributes
57 - Check if obj is a proxy that claims to have all attributes
55 - Catch attribute access failing with any exception
58 - Catch attribute access failing with any exception
56 - Check that the attribute is a callable object
59 - Check that the attribute is a callable object
57
60
58 Returns the method or None.
61 Returns the method or None.
59 """
62 """
60 if inspect.isclass(obj):
63 if inspect.isclass(obj):
61 return None
64 return None
62
65
63 try:
66 try:
64 canary = getattr(obj, '_ipython_canary_method_should_not_exist_', None)
67 canary = getattr(obj, '_ipython_canary_method_should_not_exist_', None)
65 except Exception:
68 except Exception:
66 return None
69 return None
67
70
68 if canary is not None:
71 if canary is not None:
69 # It claimed to have an attribute it should never have
72 # It claimed to have an attribute it should never have
70 return None
73 return None
71
74
72 try:
75 try:
73 m = getattr(obj, name, None)
76 m = getattr(obj, name, None)
74 except Exception:
77 except Exception:
75 return None
78 return None
76
79
77 if callable(m):
80 if callable(m):
78 return m
81 return m
79
82
80 return None
83 return None
General Comments 0
You need to be logged in to leave comments. Login now