1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
"""This module includes tests of the code object representation.
>>> def f(x):
... def g(y):
... return x + y
... return g
...
>>> dump(f.__code__)
name: f
argcount: 1
kwonlyargcount: 0
names: ()
varnames: ('x', 'g')
cellvars: ('x',)
freevars: ()
nlocals: 2
flags: 3
consts: ('None', '<code object g>', "'f.<locals>.g'")
>>> dump(f(4).__code__)
name: g
argcount: 1
kwonlyargcount: 0
names: ()
varnames: ('y',)
cellvars: ()
freevars: ('x',)
nlocals: 1
flags: 19
consts: ('None',)
>>> def h(x, y):
... a = x + y
... b = x - y
... c = a * b
... return c
...
>>> dump(h.__code__)
name: h
argcount: 2
kwonlyargcount: 0
names: ()
varnames: ('x', 'y', 'a', 'b', 'c')
cellvars: ()
freevars: ()
nlocals: 5
flags: 67
consts: ('None',)
>>> def attrs(obj):
... print(obj.attr1)
... print(obj.attr2)
... print(obj.attr3)
>>> dump(attrs.__code__)
name: attrs
argcount: 1
kwonlyargcount: 0
names: ('print', 'attr1', 'attr2', 'attr3')
varnames: ('obj',)
cellvars: ()
freevars: ()
nlocals: 1
flags: 67
consts: ('None',)
>>> def optimize_away():
... 'doc string'
... 'not a docstring'
... 53
... 0x53
>>> dump(optimize_away.__code__)
name: optimize_away
argcount: 0
kwonlyargcount: 0
names: ()
varnames: ()
cellvars: ()
freevars: ()
nlocals: 0
flags: 67
consts: ("'doc string'", 'None')
>>> def keywordonly_args(a,b,*,k1):
... return a,b,k1
...
>>> dump(keywordonly_args.__code__)
name: keywordonly_args
argcount: 2
kwonlyargcount: 1
names: ()
varnames: ('a', 'b', 'k1')
cellvars: ()
freevars: ()
nlocals: 3
flags: 67
consts: ('None',)
"""
import sys
import unittest
import weakref
from test.support import run_doctest, run_unittest, cpython_only
def consts(t):
"""Yield a doctest-safe sequence of object reprs."""
for elt in t:
r = repr(elt)
if r.startswith("<code object"):
yield "<code object %s>" % elt.co_name
else:
yield r
def dump(co):
"""Print out a text representation of a code object."""
for attr in ["name", "argcount", "kwonlyargcount", "names", "varnames",
"cellvars", "freevars", "nlocals", "flags"]:
print("%s: %s" % (attr, getattr(co, "co_" + attr)))
print("consts:", tuple(consts(co.co_consts)))
class CodeTest(unittest.TestCase):
@cpython_only
def test_newempty(self):
import _testcapi
co = _testcapi.code_newempty("filename", "funcname", 15)
self.assertEqual(co.co_filename, "filename")
self.assertEqual(co.co_name, "funcname")
self.assertEqual(co.co_firstlineno, 15)
def isinterned(s):
return s is sys.intern(('_' + s + '_')[1:-1])
class CodeConstsTest(unittest.TestCase):
def find_const(self, consts, value):
for v in consts:
if v == value:
return v
self.assertIn(value, consts) # raises an exception
self.fail('Should never be reached')
def assertIsInterned(self, s):
if not isinterned(s):
self.fail('String %r is not interned' % (s,))
def assertIsNotInterned(self, s):
if isinterned(s):
self.fail('String %r is interned' % (s,))
@cpython_only
def test_interned_string(self):
co = compile('res = "str_value"', '?', 'exec')
v = self.find_const(co.co_consts, 'str_value')
self.assertIsInterned(v)
@cpython_only
def test_interned_string_in_tuple(self):
co = compile('res = ("str_value",)', '?', 'exec')
v = self.find_const(co.co_consts, ('str_value',))
self.assertIsInterned(v[0])
@cpython_only
def test_interned_string_in_frozenset(self):
co = compile('res = a in {"str_value"}', '?', 'exec')
v = self.find_const(co.co_consts, frozenset(('str_value',)))
self.assertIsInterned(tuple(v)[0])
@cpython_only
def test_interned_string_default(self):
def f(a='str_value'):
return a
self.assertIsInterned(f())
@cpython_only
def test_interned_string_with_null(self):
co = compile(r'res = "str\0value!"', '?', 'exec')
v = self.find_const(co.co_consts, 'str\0value!')
self.assertIsNotInterned(v)
class CodeWeakRefTest(unittest.TestCase):
def test_basic(self):
# Create a code object in a clean environment so that we know we have
# the only reference to it left.
namespace = {}
exec("def f(): pass", globals(), namespace)
f = namespace["f"]
del namespace
self.called = False
def callback(code):
self.called = True
# f is now the last reference to the function, and through it, the code
# object. While we hold it, check that we can create a weakref and
# deref it. Then delete it, and check that the callback gets called and
# the reference dies.
coderef = weakref.ref(f.__code__, callback)
self.assertTrue(bool(coderef()))
del f
self.assertFalse(bool(coderef()))
self.assertTrue(self.called)
def test_main(verbose=None):
from test import test_code
run_doctest(test_code, verbose)
run_unittest(CodeTest, CodeConstsTest, CodeWeakRefTest)
if __name__ == "__main__":
test_main()
|
