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# 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)
def test_infinite_recursion():
def g():
try:
return g()
except ValueError:
return -1
try:
g()
except RuntimeError:
pass
else:
print "Expected exception"
test_infinite_recursion()
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