summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_import.py
blob: a72b8bd072d8d7141e8c47c1d4c4db7302d8f843 (plain)
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
from test.test_support import TESTFN, TestFailed

import os
import random
import sys
import py_compile

# Brief digression to test that import is case-sensitive:  if we got this
# far, we know for sure that "random" exists.
try:
    import RAnDoM
except ImportError:
    pass
else:
    raise TestFailed("import of RAnDoM should have failed (case mismatch)")

# Another brief digression to test the accuracy of manifest float constants.
from test import double_const  # don't blink -- that *was* the test

def remove_files(name):
    for f in (name + os.extsep + "py",
              name + os.extsep + "pyc",
              name + os.extsep + "pyo",
              name + os.extsep + "pyw",
              name + "$py.class"):
        if os.path.exists(f):
            os.remove(f)

def test_with_extension(ext): # ext normally ".py"; perhaps ".pyw"
    source = TESTFN + ext
    pyo = TESTFN + os.extsep + "pyo"
    if sys.platform.startswith('java'):
        pyc = TESTFN + "$py.class"
    else:
        pyc = TESTFN + os.extsep + "pyc"

    f = open(source, "w")
    print >> f, "# This tests Python's ability to import a", ext, "file."
    a = random.randrange(1000)
    b = random.randrange(1000)
    print >> f, "a =", a
    print >> f, "b =", b
    f.close()

    try:
        try:
            mod = __import__(TESTFN)
        except ImportError, err:
            raise ValueError("import from %s failed: %s" % (ext, err))

        if mod.a != a or mod.b != b:
            print a, "!=", mod.a
            print b, "!=", mod.b
            raise ValueError("module loaded (%s) but contents invalid" % mod)
    finally:
        os.unlink(source)

    try:
        try:
            reload(mod)
        except ImportError, err:
            raise ValueError("import from .pyc/.pyo failed: %s" % err)
    finally:
        try:
            os.unlink(pyc)
        except os.error:
            pass
        try:
            os.unlink(pyo)
        except os.error:
            pass
        del sys.modules[TESTFN]

sys.path.insert(0, os.curdir)
try:
    test_with_extension(os.extsep + "py")
    if sys.platform.startswith("win"):
        for ext in ".PY", ".Py", ".pY", ".pyw", ".PYW", ".pYw":
            test_with_extension(ext)
finally:
    del sys.path[0]

# Verify that the imp module can correctly load and find .py files
import imp
x = imp.find_module("os")
os = imp.load_module("os", *x)

def test_module_with_large_stack(module):
    # create module w/list of 65000 elements to test bug #561858
    filename = module + os.extsep + 'py'

    # create a file with a list of 65000 elements
    f = open(filename, 'w+')
    f.write('d = [\n')
    for i in range(65000):
        f.write('"",\n')
    f.write(']')
    f.close()

    # compile & remove .py file, we only need .pyc (or .pyo)
    f = open(filename, 'r')
    py_compile.compile(filename)
    f.close()
    os.unlink(filename)

    # need to be able to load from current dir
    sys.path.append('')

    # this used to crash
    exec 'import ' + module

    # cleanup
    del sys.path[-1]
    for ext in 'pyc', 'pyo':
        fname = module + os.extsep + ext
        if os.path.exists(fname):
            os.unlink(fname)

test_module_with_large_stack('longlist')

def test_failing_import_sticks():
    source = TESTFN + os.extsep + "py"
    f = open(source, "w")
    print >> f, "a = 1/0"
    f.close()

    # New in 2.4, we shouldn't be able to import that no matter how often
    # we try.
    sys.path.insert(0, os.curdir)
    try:
        for i in 1, 2, 3:
            try:
                mod = __import__(TESTFN)
            except ZeroDivisionError:
                if TESTFN in sys.modules:
                    raise TestFailed("damaged module in sys.modules", i)
            else:
                raise TestFailed("was able to import a damaged module", i)
    finally:
        sys.path.pop(0)
        remove_files(TESTFN)

test_failing_import_sticks()

def test_failing_reload():
    # A failing reload should leave the module object in sys.modules.
    source = TESTFN + os.extsep + "py"
    f = open(source, "w")
    print >> f, "a = 1"
    print >> f, "b = 2"
    f.close()

    sys.path.insert(0, os.curdir)
    try:
        mod = __import__(TESTFN)
        if TESTFN not in sys.modules:
            raise TestFailed("expected module in sys.modules")
        if mod.a != 1 or mod.b != 2:
            raise TestFailed("module has wrong attribute values")

        # On WinXP, just replacing the .py file wasn't enough to
        # convince reload() to reparse it.  Maybe the timestamp didn't
        # move enough.  We force it to get reparsed by removing the
        # compiled file too.
        remove_files(TESTFN)

        # Now damage the module.
        f = open(source, "w")
        print >> f, "a = 10"
        print >> f, "b = 20//0"
        f.close()
        try:
            reload(mod)
        except ZeroDivisionError:
            pass
        else:
            raise TestFailed("was able to reload a damaged module")

        # But we still expect the module to be in sys.modules.
        mod = sys.modules.get(TESTFN)
        if mod is None:
            raise TestFailed("expected module to still be in sys.modules")
        # We should have replaced a w/ 10, but the old b value should
        # stick.
        if mod.a != 10 or mod.b != 2:
            raise TestFailed("module has wrong attribute values")

    finally:
        sys.path.pop(0)
        remove_files(TESTFN)
        if TESTFN in sys.modules:
            del sys.modules[TESTFN]

test_failing_reload()

def test_import_name_binding():
    # import x.y.z binds x in the current namespace
    import test as x
    import test.test_support
    assert x is test, x.__name__
    assert hasattr(test.test_support, "__file__")

    # import x.y.z as w binds z as w
    import test.test_support as y
    assert y is test.test_support, y.__name__

test_import_name_binding()