Lib/test/test_strptime.py

   1 """PyUnit testing against strptime"""
   2
   3 import unittest
   4 import time
   5 import locale
   6 import re
   7 import sys
   8 from test import test_support
   9 from datetime import date as datetime_date
  10
  11 import _strptime
  12
  13 class getlang_Tests(unittest.TestCase):
  14     """Test _getlang"""
  15     def test_basic(self):
  16         self.assertEqual(_strptime._getlang(), locale.getlocale(locale.LC_TIME))
  17
  18 class LocaleTime_Tests(unittest.TestCase):
  19     """Tests for _strptime.LocaleTime.
  20
  21     All values are lower-cased when stored in LocaleTime, so make sure to
  22     compare values after running ``lower`` on them.
  23
  24     """
  25
  26     def setUp(self):
  27         """Create time tuple based on current time."""
  28         self.time_tuple = time.localtime()
  29         self.LT_ins = _strptime.LocaleTime()
  30
  31     def compare_against_time(self, testing, directive, tuple_position,
  32                              error_msg):
  33         """Helper method that tests testing against directive based on the
  34         tuple_position of time_tuple.  Uses error_msg as error message.
  35
  36         """
  37         strftime_output = time.strftime(directive, self.time_tuple).lower()
  38         comparison = testing[self.time_tuple[tuple_position]]
  39         self.assertTrue(strftime_output in testing, "%s: not found in tuple" %
  40                                                     error_msg)
  41         self.assertTrue(comparison == strftime_output,
  42                         "%s: position within tuple incorrect; %s != %s" %
  43                         (error_msg, comparison, strftime_output))
  44
  45     def test_weekday(self):
  46         # Make sure that full and abbreviated weekday names are correct in
  47         # both string and position with tuple
  48         self.compare_against_time(self.LT_ins.f_weekday, '%A', 6,
  49                                   "Testing of full weekday name failed")
  50         self.compare_against_time(self.LT_ins.a_weekday, '%a', 6,
  51                                   "Testing of abbreviated weekday name failed")
  52
  53     def test_month(self):
  54         # Test full and abbreviated month names; both string and position
  55         # within the tuple
  56         self.compare_against_time(self.LT_ins.f_month, '%B', 1,
  57                                   "Testing against full month name failed")
  58         self.compare_against_time(self.LT_ins.a_month, '%b', 1,
  59                                   "Testing against abbreviated month name failed")
  60
  61     def test_am_pm(self):
  62         # Make sure AM/PM representation done properly
  63         strftime_output = time.strftime("%p", self.time_tuple).lower()
  64         self.assertTrue(strftime_output in self.LT_ins.am_pm,
  65                         "AM/PM representation not in tuple")
  66         if self.time_tuple[3] < 12: position = 0
  67         else: position = 1
  68         self.assertTrue(strftime_output == self.LT_ins.am_pm[position],
  69                         "AM/PM representation in the wrong position within the tuple")
  70
  71     def test_timezone(self):
  72         # Make sure timezone is correct
  73         timezone = time.strftime("%Z", self.time_tuple).lower()
  74         if timezone:
  75             self.assertTrue(timezone in self.LT_ins.timezone[0] or \
  76                             timezone in self.LT_ins.timezone[1],
  77                             "timezone %s not found in %s" %
  78                             (timezone, self.LT_ins.timezone))
  79
  80     def test_date_time(self):
  81         # Check that LC_date_time, LC_date, and LC_time are correct
  82         # the magic date is used so as to not have issues with %c when day of
  83         #  the month is a single digit and has a leading space.  This is not an
  84         #  issue since strptime still parses it correctly.  The problem is
  85         #  testing these directives for correctness by comparing strftime
  86         #  output.
  87         magic_date = (1999, 3, 17, 22, 44, 55, 2, 76, 0)
  88         strftime_output = time.strftime("%c", magic_date)
  89         self.assertTrue(strftime_output == time.strftime(self.LT_ins.LC_date_time,
  90                                                          magic_date),
  91                         "LC_date_time incorrect")
  92         strftime_output = time.strftime("%x", magic_date)
  93         self.assertTrue(strftime_output == time.strftime(self.LT_ins.LC_date,
  94                                                          magic_date),
  95                         "LC_date incorrect")
  96         strftime_output = time.strftime("%X", magic_date)
  97         self.assertTrue(strftime_output == time.strftime(self.LT_ins.LC_time,
  98                                                          magic_date),
  99                         "LC_time incorrect")
 100         LT = _strptime.LocaleTime()
 101         LT.am_pm = ('', '')
 102         self.assertTrue(LT.LC_time, "LocaleTime's LC directives cannot handle "
 103                                     "empty strings")
 104
 105     def test_lang(self):
 106         # Make sure lang is set to what _getlang() returns
 107         # Assuming locale has not changed between now and when self.LT_ins was created
 108         self.assertEqual(self.LT_ins.lang, _strptime._getlang())
 109
 110
 111 class TimeRETests(unittest.TestCase):
 112     """Tests for TimeRE."""
 113
 114     def setUp(self):
 115         """Construct generic TimeRE object."""
 116         self.time_re = _strptime.TimeRE()
 117         self.locale_time = _strptime.LocaleTime()
 118
 119     def test_pattern(self):
 120         # Test TimeRE.pattern
 121         pattern_string = self.time_re.pattern(r"%a %A %d")
 122         self.assertTrue(pattern_string.find(self.locale_time.a_weekday[2]) != -1,
 123                         "did not find abbreviated weekday in pattern string '%s'" %
 124                          pattern_string)
 125         self.assertTrue(pattern_string.find(self.locale_time.f_weekday[4]) != -1,
 126                         "did not find full weekday in pattern string '%s'" %
 127                          pattern_string)
 128         self.assertTrue(pattern_string.find(self.time_re['d']) != -1,
 129                         "did not find 'd' directive pattern string '%s'" %
 130                          pattern_string)
 131
 132     def test_pattern_escaping(self):
 133         # Make sure any characters in the format string that might be taken as
 134         # regex syntax is escaped.
 135         pattern_string = self.time_re.pattern("\d+")
 136         self.assertTrue(r"\\d\+" in pattern_string,
 137                         "%s does not have re characters escaped properly" %
 138                         pattern_string)
 139
 140     def test_compile(self):
 141         # Check that compiled regex is correct
 142         found = self.time_re.compile(r"%A").match(self.locale_time.f_weekday[6])
 143         self.assertTrue(found and found.group('A') == self.locale_time.f_weekday[6],
 144                         "re object for '%A' failed")
 145         compiled = self.time_re.compile(r"%a %b")
 146         found = compiled.match("%s %s" % (self.locale_time.a_weekday[4],
 147                                self.locale_time.a_month[4]))
 148         self.assertTrue(found,
 149             "Match failed with '%s' regex and '%s' string" %
 150              (compiled.pattern, "%s %s" % (self.locale_time.a_weekday[4],
 151                                            self.locale_time.a_month[4])))
 152         self.assertTrue(found.group('a') == self.locale_time.a_weekday[4] and
 153                          found.group('b') == self.locale_time.a_month[4],
 154                         "re object couldn't find the abbreviated weekday month in "
 155                          "'%s' using '%s'; group 'a' = '%s', group 'b' = %s'" %
 156                          (found.string, found.re.pattern, found.group('a'),
 157                           found.group('b')))
 158         for directive in ('a','A','b','B','c','d','H','I','j','m','M','p','S',
 159                           'U','w','W','x','X','y','Y','Z','%'):
 160             compiled = self.time_re.compile("%" + directive)
 161             found = compiled.match(time.strftime("%" + directive))
 162             self.assertTrue(found, "Matching failed on '%s' using '%s' regex" %
 163                                     (time.strftime("%" + directive),
 164                                      compiled.pattern))
 165
 166     def test_blankpattern(self):
 167         # Make sure when tuple or something has no values no regex is generated.
 168         # Fixes bug #661354
 169         test_locale = _strptime.LocaleTime()
 170         test_locale.timezone = (frozenset(), frozenset())
 171         self.assertTrue(_strptime.TimeRE(test_locale).pattern("%Z") == '',
 172                         "with timezone == ('',''), TimeRE().pattern('%Z') != ''")
 173
 174     def test_matching_with_escapes(self):
 175         # Make sure a format that requires escaping of characters works
 176         compiled_re = self.time_re.compile("\w+ %m")
 177         found = compiled_re.match("\w+ 10")
 178         self.assertTrue(found, "Escaping failed of format '\w+ 10'")
 179
 180     def test_locale_data_w_regex_metacharacters(self):
 181         # Check that if locale data contains regex metacharacters they are
 182         # escaped properly.
 183         # Discovered by bug #1039270 .
 184         locale_time = _strptime.LocaleTime()
 185         locale_time.timezone = (frozenset(("utc", "gmt",
 186                                             "Tokyo (standard time)")),
 187                                 frozenset("Tokyo (daylight time)"))
 188         time_re = _strptime.TimeRE(locale_time)
 189         self.assertTrue(time_re.compile("%Z").match("Tokyo (standard time)"),
 190                         "locale data that contains regex metacharacters is not"
 191                         " properly escaped")
 192
 193     def test_whitespace_substitution(self):
 194         # When pattern contains whitespace, make sure it is taken into account
 195         # so as to not allow to subpatterns to end up next to each other and
 196         # "steal" characters from each other.
 197         pattern = self.time_re.pattern('%j %H')
 198         self.assertTrue(not re.match(pattern, "180"))
 199         self.assertTrue(re.match(pattern, "18 0"))
 200
 201
 202 class StrptimeTests(unittest.TestCase):
 203     """Tests for _strptime.strptime."""
 204
 205     def setUp(self):
 206         """Create testing time tuple."""
 207         self.time_tuple = time.gmtime()
 208
 209     def test_ValueError(self):
 210         # Make sure ValueError is raised when match fails or format is bad
 211         self.assertRaises(ValueError, _strptime._strptime_time, data_string="%d",
 212                           format="%A")
 213         for bad_format in ("%", "% ", "%e"):
 214             try:
 215                 _strptime._strptime_time("2005", bad_format)
 216             except ValueError:
 217                 continue
 218             except Exception, err:
 219                 self.fail("'%s' raised %s, not ValueError" %
 220                             (bad_format, err.__class__.__name__))
 221             else:
 222                 self.fail("'%s' did not raise ValueError" % bad_format)
 223
 224     def test_unconverteddata(self):
 225         # Check ValueError is raised when there is unconverted data
 226         self.assertRaises(ValueError, _strptime._strptime_time, "10 12", "%m")
 227
 228     def helper(self, directive, position):
 229         """Helper fxn in testing."""
 230         strf_output = time.strftime("%" + directive, self.time_tuple)
 231         strp_output = _strptime._strptime_time(strf_output, "%" + directive)
 232         self.assertTrue(strp_output[position] == self.time_tuple[position],
 233                         "testing of '%s' directive failed; '%s' -> %s != %s" %
 234                          (directive, strf_output, strp_output[position],
 235                           self.time_tuple[position]))
 236
 237     def test_year(self):
 238         # Test that the year is handled properly
 239         for directive in ('y', 'Y'):
 240             self.helper(directive, 0)
 241         # Must also make sure %y values are correct for bounds set by Open Group
 242         for century, bounds in ((1900, ('69', '99')), (2000, ('00', '68'))):
 243             for bound in bounds:
 244                 strp_output = _strptime._strptime_time(bound, '%y')
 245                 expected_result = century + int(bound)
 246                 self.assertTrue(strp_output[0] == expected_result,
 247                                 "'y' test failed; passed in '%s' "
 248                                 "and returned '%s'" % (bound, strp_output[0]))
 249
 250     def test_month(self):
 251         # Test for month directives
 252         for directive in ('B', 'b', 'm'):
 253             self.helper(directive, 1)
 254
 255     def test_day(self):
 256         # Test for day directives
 257         self.helper('d', 2)
 258
 259     def test_hour(self):
 260         # Test hour directives
 261         self.helper('H', 3)
 262         strf_output = time.strftime("%I %p", self.time_tuple)
 263         strp_output = _strptime._strptime_time(strf_output, "%I %p")
 264         self.assertTrue(strp_output[3] == self.time_tuple[3],
 265                         "testing of '%%I %%p' directive failed; '%s' -> %s != %s" %
 266                          (strf_output, strp_output[3], self.time_tuple[3]))
 267
 268     def test_minute(self):
 269         # Test minute directives
 270         self.helper('M', 4)
 271
 272     def test_second(self):
 273         # Test second directives
 274         self.helper('S', 5)
 275
 276     def test_fraction(self):
 277         import datetime
 278         now = datetime.datetime.now()
 279         tup, frac = _strptime._strptime(str(now), format="%Y-%m-%d %H:%M:%S.%f")
 280         self.assertEqual(frac, now.microsecond)
 281
 282     def test_weekday(self):
 283         # Test weekday directives
 284         for directive in ('A', 'a', 'w'):
 285             self.helper(directive,6)
 286
 287     def test_julian(self):
 288         # Test julian directives
 289         self.helper('j', 7)
 290
 291     def test_timezone(self):
 292         # Test timezone directives.
 293         # When gmtime() is used with %Z, entire result of strftime() is empty.
 294         # Check for equal timezone names deals with bad locale info when this
 295         # occurs; first found in FreeBSD 4.4.
 296         strp_output = _strptime._strptime_time("UTC", "%Z")
 297         self.assertEqual(strp_output.tm_isdst, 0)
 298         strp_output = _strptime._strptime_time("GMT", "%Z")
 299         self.assertEqual(strp_output.tm_isdst, 0)
 300         if sys.platform == "mac":
 301             # Timezones don't really work on MacOS9
 302             return
 303         time_tuple = time.localtime()
 304         strf_output = time.strftime("%Z")  #UTC does not have a timezone
 305         strp_output = _strptime._strptime_time(strf_output, "%Z")
 306         locale_time = _strptime.LocaleTime()
 307         if time.tzname[0] != time.tzname[1] or not time.daylight:
 308             self.assertTrue(strp_output[8] == time_tuple[8],
 309                             "timezone check failed; '%s' -> %s != %s" %
 310                              (strf_output, strp_output[8], time_tuple[8]))
 311         else:
 312             self.assertTrue(strp_output[8] == -1,
 313                             "LocaleTime().timezone has duplicate values and "
 314                              "time.daylight but timezone value not set to -1")
 315
 316     def test_bad_timezone(self):
 317         # Explicitly test possibility of bad timezone;
 318         # when time.tzname[0] == time.tzname[1] and time.daylight
 319         if sys.platform == "mac":
 320             return #MacOS9 has severely broken timezone support.
 321         tz_name = time.tzname[0]
 322         if tz_name.upper() in ("UTC", "GMT"):
 323             return
 324         try:
 325             original_tzname = time.tzname
 326             original_daylight = time.daylight
 327             time.tzname = (tz_name, tz_name)
 328             time.daylight = 1
 329             tz_value = _strptime._strptime_time(tz_name, "%Z")[8]
 330             self.assertEqual(tz_value, -1,
 331                     "%s lead to a timezone value of %s instead of -1 when "
 332                     "time.daylight set to %s and passing in %s" %
 333                     (time.tzname, tz_value, time.daylight, tz_name))
 334         finally:
 335             time.tzname = original_tzname
 336             time.daylight = original_daylight
 337
 338     def test_date_time(self):
 339         # Test %c directive
 340         for position in range(6):
 341             self.helper('c', position)
 342
 343     def test_date(self):
 344         # Test %x directive
 345         for position in range(0,3):
 346             self.helper('x', position)
 347
 348     def test_time(self):
 349         # Test %X directive
 350         for position in range(3,6):
 351             self.helper('X', position)
 352
 353     def test_percent(self):
 354         # Make sure % signs are handled properly
 355         strf_output = time.strftime("%m %% %Y", self.time_tuple)
 356         strp_output = _strptime._strptime_time(strf_output, "%m %% %Y")
 357         self.assertTrue(strp_output[0] == self.time_tuple[0] and
 358                          strp_output[1] == self.time_tuple[1],
 359                         "handling of percent sign failed")
 360
 361     def test_caseinsensitive(self):
 362         # Should handle names case-insensitively.
 363         strf_output = time.strftime("%B", self.time_tuple)
 364         self.assertTrue(_strptime._strptime_time(strf_output.upper(), "%B"),
 365                         "strptime does not handle ALL-CAPS names properly")
 366         self.assertTrue(_strptime._strptime_time(strf_output.lower(), "%B"),
 367                         "strptime does not handle lowercase names properly")
 368         self.assertTrue(_strptime._strptime_time(strf_output.capitalize(), "%B"),
 369                         "strptime does not handle capword names properly")
 370
 371     def test_defaults(self):
 372         # Default return value should be (1900, 1, 1, 0, 0, 0, 0, 1, 0)
 373         defaults = (1900, 1, 1, 0, 0, 0, 0, 1, -1)
 374         strp_output = _strptime._strptime_time('1', '%m')
 375         self.assertTrue(strp_output == defaults,
 376                         "Default values for strptime() are incorrect;"
 377                         " %s != %s" % (strp_output, defaults))
 378
 379     def test_escaping(self):
 380         # Make sure all characters that have regex significance are escaped.
 381         # Parentheses are in a purposeful order; will cause an error of
 382         # unbalanced parentheses when the regex is compiled if they are not
 383         # escaped.
 384         # Test instigated by bug #796149 .
 385         need_escaping = ".^$*+?{}\[]|)("
 386         self.assertTrue(_strptime._strptime_time(need_escaping, need_escaping))
 387
 388 class Strptime12AMPMTests(unittest.TestCase):
 389     """Test a _strptime regression in '%I %p' at 12 noon (12 PM)"""
 390
 391     def test_twelve_noon_midnight(self):
 392         eq = self.assertEqual
 393         eq(time.strptime('12 PM', '%I %p')[3], 12)
 394         eq(time.strptime('12 AM', '%I %p')[3], 0)
 395         eq(_strptime._strptime_time('12 PM', '%I %p')[3], 12)
 396         eq(_strptime._strptime_time('12 AM', '%I %p')[3], 0)
 397
 398
 399 class JulianTests(unittest.TestCase):
 400     """Test a _strptime regression that all julian (1-366) are accepted"""
 401
 402     def test_all_julian_days(self):
 403         eq = self.assertEqual
 404         for i in range(1, 367):
 405             # use 2004, since it is a leap year, we have 366 days
 406             eq(_strptime._strptime_time('%d 2004' % i, '%j %Y')[7], i)
 407
 408 class CalculationTests(unittest.TestCase):
 409     """Test that strptime() fills in missing info correctly"""
 410
 411     def setUp(self):
 412         self.time_tuple = time.gmtime()
 413
 414     def test_julian_calculation(self):
 415         # Make sure that when Julian is missing that it is calculated
 416         format_string = "%Y %m %d %H %M %S %w %Z"
 417         result = _strptime._strptime_time(time.strftime(format_string, self.time_tuple),
 418                                     format_string)
 419         self.assertTrue(result.tm_yday == self.time_tuple.tm_yday,
 420                         "Calculation of tm_yday failed; %s != %s" %
 421                          (result.tm_yday, self.time_tuple.tm_yday))
 422
 423     def test_gregorian_calculation(self):
 424         # Test that Gregorian date can be calculated from Julian day
 425         format_string = "%Y %H %M %S %w %j %Z"
 426         result = _strptime._strptime_time(time.strftime(format_string, self.time_tuple),
 427                                     format_string)
 428         self.assertTrue(result.tm_year == self.time_tuple.tm_year and
 429                          result.tm_mon == self.time_tuple.tm_mon and
 430                          result.tm_mday == self.time_tuple.tm_mday,
 431                         "Calculation of Gregorian date failed;"
 432                          "%s-%s-%s != %s-%s-%s" %
 433                          (result.tm_year, result.tm_mon, result.tm_mday,
 434                           self.time_tuple.tm_year, self.time_tuple.tm_mon,
 435                           self.time_tuple.tm_mday))
 436
 437     def test_day_of_week_calculation(self):
 438         # Test that the day of the week is calculated as needed
 439         format_string = "%Y %m %d %H %S %j %Z"
 440         result = _strptime._strptime_time(time.strftime(format_string, self.time_tuple),
 441                                     format_string)
 442         self.assertTrue(result.tm_wday == self.time_tuple.tm_wday,
 443                         "Calculation of day of the week failed;"
 444                          "%s != %s" % (result.tm_wday, self.time_tuple.tm_wday))
 445
 446     def test_week_of_year_and_day_of_week_calculation(self):
 447         # Should be able to infer date if given year, week of year (%U or %W)
 448         # and day of the week
 449         def test_helper(ymd_tuple, test_reason):
 450             for directive in ('W', 'U'):
 451                 format_string = "%%Y %%%s %%w" % directive
 452                 dt_date = datetime_date(*ymd_tuple)
 453                 strp_input = dt_date.strftime(format_string)
 454                 strp_output = _strptime._strptime_time(strp_input, format_string)
 455                 self.assertTrue(strp_output[:3] == ymd_tuple,
 456                         "%s(%s) test failed w/ '%s': %s != %s (%s != %s)" %
 457                             (test_reason, directive, strp_input,
 458                                 strp_output[:3], ymd_tuple,
 459                                 strp_output[7], dt_date.timetuple()[7]))
 460         test_helper((1901, 1, 3), "week 0")
 461         test_helper((1901, 1, 8), "common case")
 462         test_helper((1901, 1, 13), "day on Sunday")
 463         test_helper((1901, 1, 14), "day on Monday")
 464         test_helper((1905, 1, 1), "Jan 1 on Sunday")
 465         test_helper((1906, 1, 1), "Jan 1 on Monday")
 466         test_helper((1906, 1, 7), "first Sunday in a year starting on Monday")
 467         test_helper((1905, 12, 31), "Dec 31 on Sunday")
 468         test_helper((1906, 12, 31), "Dec 31 on Monday")
 469         test_helper((2008, 12, 29), "Monday in the last week of the year")
 470         test_helper((2008, 12, 22), "Monday in the second-to-last week of the "
 471                                     "year")
 472         test_helper((1978, 10, 23), "randomly chosen date")
 473         test_helper((2004, 12, 18), "randomly chosen date")
 474         test_helper((1978, 10, 23), "year starting and ending on Monday while "
 475                                         "date not on Sunday or Monday")
 476         test_helper((1917, 12, 17), "year starting and ending on Monday with "
 477                                         "a Monday not at the beginning or end "
 478                                         "of the year")
 479         test_helper((1917, 12, 31), "Dec 31 on Monday with year starting and "
 480                                         "ending on Monday")
 481         test_helper((2007, 01, 07), "First Sunday of 2007")
 482         test_helper((2007, 01, 14), "Second Sunday of 2007")
 483         test_helper((2006, 12, 31), "Last Sunday of 2006")
 484         test_helper((2006, 12, 24), "Second to last Sunday of 2006")
 485
 486
 487 class CacheTests(unittest.TestCase):
 488     """Test that caching works properly."""
 489
 490     def test_time_re_recreation(self):
 491         # Make sure cache is recreated when current locale does not match what
 492         # cached object was created with.
 493         _strptime._strptime_time("10", "%d")
 494         _strptime._strptime_time("2005", "%Y")
 495         _strptime._TimeRE_cache.locale_time.lang = "Ni"
 496         original_time_re = _strptime._TimeRE_cache
 497         _strptime._strptime_time("10", "%d")
 498         self.assertIsNot(original_time_re, _strptime._TimeRE_cache)
 499         self.assertEqual(len(_strptime._regex_cache), 1)
 500
 501     def test_regex_cleanup(self):
 502         # Make sure cached regexes are discarded when cache becomes "full".
 503         try:
 504             del _strptime._regex_cache['%d']
 505         except KeyError:
 506             pass
 507         bogus_key = 0
 508         while len(_strptime._regex_cache) <= _strptime._CACHE_MAX_SIZE:
 509             _strptime._regex_cache[bogus_key] = None
 510             bogus_key += 1
 511         _strptime._strptime_time("10", "%d")
 512         self.assertEqual(len(_strptime._regex_cache), 1)
 513
 514     def test_new_localetime(self):
 515         # A new LocaleTime instance should be created when a new TimeRE object
 516         # is created.
 517         locale_time_id = _strptime._TimeRE_cache.locale_time
 518         _strptime._TimeRE_cache.locale_time.lang = "Ni"
 519         _strptime._strptime_time("10", "%d")
 520         self.assertIsNot(locale_time_id, _strptime._TimeRE_cache.locale_time)
 521
 522     def test_TimeRE_recreation(self):
 523         # The TimeRE instance should be recreated upon changing the locale.
 524         locale_info = locale.getlocale(locale.LC_TIME)
 525         try:
 526             locale.setlocale(locale.LC_TIME, ('en_US', 'UTF8'))
 527         except locale.Error:
 528             return
 529         try:
 530             _strptime._strptime_time('10', '%d')
 531             # Get id of current cache object.
 532             first_time_re = _strptime._TimeRE_cache
 533             try:
 534                 # Change the locale and force a recreation of the cache.
 535                 locale.setlocale(locale.LC_TIME, ('de_DE', 'UTF8'))
 536                 _strptime._strptime_time('10', '%d')
 537                 # Get the new cache object's id.
 538                 second_time_re = _strptime._TimeRE_cache
 539                 # They should not be equal.
 540                 self.assertIsNot(first_time_re, second_time_re)
 541             # Possible test locale is not supported while initial locale is.
 542             # If this is the case just suppress the exception and fall-through
 543             # to the reseting to the original locale.
 544             except locale.Error:
 545                 pass
 546         # Make sure we don't trample on the locale setting once we leave the
 547         # test.
 548         finally:
 549             locale.setlocale(locale.LC_TIME, locale_info)
 550
 551
 552 def test_main():
 553     test_support.run_unittest(
 554         getlang_Tests,
 555         LocaleTime_Tests,
 556         TimeRETests,
 557         StrptimeTests,
 558         Strptime12AMPMTests,
 559         JulianTests,
 560         CalculationTests,
 561         CacheTests
 562     )
 563
 564
 565 if __name__ == '__main__':
 566     test_main()