cpython/Lib/test/test_exceptions.py
Tim Peters c885443479 Stop producing or using OverflowWarning. PEP 237 thought this would
happen in 2.3, but nobody noticed it still was getting generated (the
warning was disabled by default).  OverflowWarning and
PyExc_OverflowWarning should be removed for 2.5, and left notes all over
saying so.
2004-08-25 02:14:08 +00:00

211 lines
4.6 KiB
Python

# Python test set -- part 5, built-in exceptions
from test.test_support import TestFailed, TESTFN, unlink
from types import ClassType
import warnings
import sys, traceback, os
print '5. Built-in exceptions'
# XXX This is not really enough, each *operation* should be tested!
# Reloading the built-in exceptions module failed prior to Py2.2, while it
# should act the same as reloading built-in sys.
try:
import exceptions
reload(exceptions)
except ImportError, e:
raise TestFailed, e
def test_raise_catch(exc):
try:
raise exc, "spam"
except exc, err:
buf = str(err)
try:
raise exc("spam")
except exc, err:
buf = str(err)
print buf
def r(thing):
test_raise_catch(thing)
if isinstance(thing, ClassType):
print thing.__name__
else:
print thing
r(AttributeError)
import sys
try: x = sys.undefined_attribute
except AttributeError: pass
r(EOFError)
import sys
fp = open(TESTFN, 'w')
fp.close()
fp = open(TESTFN, 'r')
savestdin = sys.stdin
try:
try:
sys.stdin = fp
x = raw_input()
except EOFError:
pass
finally:
sys.stdin = savestdin
fp.close()
r(IOError)
try: open('this file does not exist', 'r')
except IOError: pass
r(ImportError)
try: import undefined_module
except ImportError: pass
r(IndexError)
x = []
try: a = x[10]
except IndexError: pass
r(KeyError)
x = {}
try: a = x['key']
except KeyError: pass
r(KeyboardInterrupt)
print '(not testable in a script)'
r(MemoryError)
print '(not safe to test)'
r(NameError)
try: x = undefined_variable
except NameError: pass
r(OverflowError)
# XXX
# Obscure: in 2.2 and 2.3, this test relied on changing OverflowWarning
# into an error, in order to trigger OverflowError. In 2.4, OverflowWarning
# should no longer be generated, so the focus of the test shifts to showing
# that OverflowError *isn't* generated. OverflowWarning should be gone
# in Python 2.5, and then the filterwarnings() call, and this comment,
# should go away.
warnings.filterwarnings("error", "", OverflowWarning, __name__)
x = 1
for dummy in range(128):
x += x # this simply shouldn't blow up
r(RuntimeError)
print '(not used any more?)'
r(SyntaxError)
try: exec '/\n'
except SyntaxError: pass
# make sure the right exception message is raised for each of these
# code fragments:
def ckmsg(src, msg):
try:
compile(src, '<fragment>', 'exec')
except SyntaxError, e:
print e.msg
if e.msg == msg:
print "ok"
else:
print "expected:", msg
else:
print "failed to get expected SyntaxError"
s = '''\
while 1:
try:
pass
finally:
continue
'''
if sys.platform.startswith('java'):
print "'continue' not supported inside 'finally' clause"
print "ok"
else:
ckmsg(s, "'continue' not supported inside 'finally' clause")
s = '''\
try:
continue
except:
pass
'''
ckmsg(s, "'continue' not properly in loop")
ckmsg("continue\n", "'continue' not properly in loop")
r(IndentationError)
r(TabError)
# can only be tested under -tt, and is the only test for -tt
#try: compile("try:\n\t1/0\n \t1/0\nfinally:\n pass\n", '<string>', 'exec')
#except TabError: pass
#else: raise TestFailed
r(SystemError)
print '(hard to reproduce)'
r(SystemExit)
import sys
try: sys.exit(0)
except SystemExit: pass
r(TypeError)
try: [] + ()
except TypeError: pass
r(ValueError)
try: x = chr(10000)
except ValueError: pass
r(ZeroDivisionError)
try: x = 1/0
except ZeroDivisionError: pass
r(Exception)
try: x = 1/0
except Exception, e: pass
# test that setting an exception at the C level works even if the
# exception object can't be constructed.
class BadException:
def __init__(self):
raise RuntimeError, "can't instantiate BadException"
def test_capi1():
import _testcapi
try:
_testcapi.raise_exception(BadException, 1)
except TypeError, err:
exc, err, tb = sys.exc_info()
co = tb.tb_frame.f_code
assert co.co_name == "test_capi1"
assert co.co_filename.endswith('test_exceptions'+os.extsep+'py')
else:
print "Expected exception"
def test_capi2():
import _testcapi
try:
_testcapi.raise_exception(BadException, 0)
except RuntimeError, err:
exc, err, tb = sys.exc_info()
co = tb.tb_frame.f_code
assert co.co_name == "__init__"
assert co.co_filename.endswith('test_exceptions'+os.extsep+'py')
co2 = tb.tb_frame.f_back.f_code
assert co2.co_name == "test_capi2"
else:
print "Expected exception"
if not sys.platform.startswith('java'):
test_capi1()
test_capi2()
unlink(TESTFN)