Lib/test/test_import.py

   1 from test_support import TESTFN, TestFailed
   2
   3 import os
   4 import random
   5 import sys
   6
   7 # Brief digression to test that import is case-sensitive:  if we got this
   8 # far, we know for sure that "random" exists.
   9 try:
  10     import RAnDoM
  11 except ImportError:
  12     pass
  13 else:
  14     raise TestFailed("import of RAnDoM should have failed (case mismatch)")
  15
  16 sys.path.insert(0, os.curdir)
  17
  18 source = TESTFN + ".py"
  19 pyc = TESTFN + ".pyc"
  20 pyo = TESTFN + ".pyo"
  21
  22 f = open(source, "w")
  23 print >> f, "# This will test Python's ability to import a .py file"
  24 a = random.randrange(1000)
  25 b = random.randrange(1000)
  26 print >> f, "a =", a
  27 print >> f, "b =", b
  28 f.close()
  29
  30 try:
  31     try:
  32         mod = __import__(TESTFN)
  33     except ImportError, err:
  34         raise ValueError, "import from .py failed: %s" % err
  35
  36     if mod.a != a or mod.b != b:
  37         print a, "!=", mod.a
  38         print b, "!=", mod.b
  39         raise ValueError, "module loaded (%s) but contents invalid" % mod
  40 finally:
  41     os.unlink(source)
  42
  43 try:
  44     try:
  45         reload(mod)
  46     except ImportError, err:
  47         raise ValueError, "import from .pyc/.pyo failed: %s" % err
  48 finally:
  49     try:
  50         os.unlink(pyc)
  51     except os.error:
  52         pass
  53     try:
  54         os.unlink(pyo)
  55     except os.error:
  56         pass
  57
  58 del sys.path[0]