1 from test.support import verbose, TestFailed
2 import locale
3 import sys
4 import re
5 import test.support as support
6 import unittest
7
8 maxsize = support.MAX_Py_ssize_t
9
10 # test string formatting operator (I am not sure if this is being tested
11 # elsewhere but, surely, some of the given cases are *not* tested because
12 # they crash python)
13 # test on bytes object as well
14
15 def testformat(formatstr, args, output=None, limit=None, overflowok=False):
16 if verbose:
17 if output:
18 print("{!a} % {!a} =? {!a} ...".format(formatstr, args, output),
19 end=' ')
20 else:
21 print("{!a} % {!a} works? ...".format(formatstr, args), end=' ')
22 try:
23 result = formatstr % args
24 except OverflowError:
25 if not overflowok:
26 raise
27 if verbose:
28 print('overflow (this is fine)')
29 else:
30 if output and limit is None and result != output:
31 if verbose:
32 print('no')
33 raise AssertionError("%r %% %r == %r != %r" %
34 (formatstr, args, result, output))
35 # when 'limit' is specified, it determines how many characters
36 # must match exactly; lengths must always match.
37 # ex: limit=5, '12345678' matches '12345___'
38 # (mainly for floating point format tests for which an exact match
39 # can't be guaranteed due to rounding and representation errors)
40 elif output and limit is not None and (
41 len(result)!=len(output) or result[:limit]!=output[:limit]):
42 if verbose:
43 print('no')
44 print("%s %% %s == %s != %s" % \
45 (repr(formatstr), repr(args), repr(result), repr(output)))
46 else:
47 if verbose:
48 print('yes')
49
50 def testcommon(formatstr, args, output=None, limit=None, overflowok=False):
51 # if formatstr is a str, test str, bytes, and bytearray;
52 # otherwise, test bytes and bytearray
53 if isinstance(formatstr, str):
54 testformat(formatstr, args, output, limit, overflowok)
55 b_format = formatstr.encode('ascii')
56 else:
57 b_format = formatstr
58 ba_format = bytearray(b_format)
59 b_args = []
60 if not isinstance(args, tuple):
61 args = (args, )
62 b_args = tuple(args)
63 if output is None:
64 b_output = ba_output = None
65 else:
66 if isinstance(output, str):
67 b_output = output.encode('ascii')
68 else:
69 b_output = output
70 ba_output = bytearray(b_output)
71 testformat(b_format, b_args, b_output, limit, overflowok)
72 testformat(ba_format, b_args, ba_output, limit, overflowok)
73
74 def test_exc(formatstr, args, exception, excmsg):
75 try:
76 testformat(formatstr, args)
77 except exception as exc:
78 if str(exc) == excmsg:
79 if verbose:
80 print("yes")
81 else:
82 if verbose: print('no')
83 print('Unexpected ', exception, ':', repr(str(exc)))
84 except:
85 if verbose: print('no')
86 print('Unexpected exception')
87 raise
88 else:
89 raise TestFailed('did not get expected exception: %s' % excmsg)
90
91 def test_exc_common(formatstr, args, exception, excmsg):
92 # test str and bytes
93 test_exc(formatstr, args, exception, excmsg)
94 test_exc(formatstr.encode('ascii'), args, exception, excmsg)
95
96 class ESC[4;38;5;81mFormatTest(ESC[4;38;5;149munittestESC[4;38;5;149m.ESC[4;38;5;149mTestCase):
97
98 def test_common_format(self):
99 # test the format identifiers that work the same across
100 # str, bytes, and bytearrays (integer, float, oct, hex)
101 testcommon("%%", (), "%")
102 testcommon("%.1d", (1,), "1")
103 testcommon("%.*d", (sys.maxsize,1), overflowok=True) # expect overflow
104 testcommon("%.100d", (1,), '00000000000000000000000000000000000000'
105 '000000000000000000000000000000000000000000000000000000'
106 '00000001', overflowok=True)
107 testcommon("%#.117x", (1,), '0x00000000000000000000000000000000000'
108 '000000000000000000000000000000000000000000000000000000'
109 '0000000000000000000000000001',
110 overflowok=True)
111 testcommon("%#.118x", (1,), '0x00000000000000000000000000000000000'
112 '000000000000000000000000000000000000000000000000000000'
113 '00000000000000000000000000001',
114 overflowok=True)
115
116 testcommon("%f", (1.0,), "1.000000")
117 # these are trying to test the limits of the internal magic-number-length
118 # formatting buffer, if that number changes then these tests are less
119 # effective
120 testcommon("%#.*g", (109, -1.e+49/3.))
121 testcommon("%#.*g", (110, -1.e+49/3.))
122 testcommon("%#.*g", (110, -1.e+100/3.))
123 # test some ridiculously large precision, expect overflow
124 testcommon('%12.*f', (123456, 1.0))
125
126 # check for internal overflow validation on length of precision
127 # these tests should no longer cause overflow in Python
128 # 2.7/3.1 and later.
129 testcommon("%#.*g", (110, -1.e+100/3.))
130 testcommon("%#.*G", (110, -1.e+100/3.))
131 testcommon("%#.*f", (110, -1.e+100/3.))
132 testcommon("%#.*F", (110, -1.e+100/3.))
133 # Formatting of integers. Overflow is not ok
134 testcommon("%x", 10, "a")
135 testcommon("%x", 100000000000, "174876e800")
136 testcommon("%o", 10, "12")
137 testcommon("%o", 100000000000, "1351035564000")
138 testcommon("%d", 10, "10")
139 testcommon("%d", 100000000000, "100000000000")
140
141 big = 123456789012345678901234567890
142 testcommon("%d", big, "123456789012345678901234567890")
143 testcommon("%d", -big, "-123456789012345678901234567890")
144 testcommon("%5d", -big, "-123456789012345678901234567890")
145 testcommon("%31d", -big, "-123456789012345678901234567890")
146 testcommon("%32d", -big, " -123456789012345678901234567890")
147 testcommon("%-32d", -big, "-123456789012345678901234567890 ")
148 testcommon("%032d", -big, "-0123456789012345678901234567890")
149 testcommon("%-032d", -big, "-123456789012345678901234567890 ")
150 testcommon("%034d", -big, "-000123456789012345678901234567890")
151 testcommon("%034d", big, "0000123456789012345678901234567890")
152 testcommon("%0+34d", big, "+000123456789012345678901234567890")
153 testcommon("%+34d", big, " +123456789012345678901234567890")
154 testcommon("%34d", big, " 123456789012345678901234567890")
155 testcommon("%.2d", big, "123456789012345678901234567890")
156 testcommon("%.30d", big, "123456789012345678901234567890")
157 testcommon("%.31d", big, "0123456789012345678901234567890")
158 testcommon("%32.31d", big, " 0123456789012345678901234567890")
159 testcommon("%d", float(big), "123456________________________", 6)
160
161 big = 0x1234567890abcdef12345 # 21 hex digits
162 testcommon("%x", big, "1234567890abcdef12345")
163 testcommon("%x", -big, "-1234567890abcdef12345")
164 testcommon("%5x", -big, "-1234567890abcdef12345")
165 testcommon("%22x", -big, "-1234567890abcdef12345")
166 testcommon("%23x", -big, " -1234567890abcdef12345")
167 testcommon("%-23x", -big, "-1234567890abcdef12345 ")
168 testcommon("%023x", -big, "-01234567890abcdef12345")
169 testcommon("%-023x", -big, "-1234567890abcdef12345 ")
170 testcommon("%025x", -big, "-0001234567890abcdef12345")
171 testcommon("%025x", big, "00001234567890abcdef12345")
172 testcommon("%0+25x", big, "+0001234567890abcdef12345")
173 testcommon("%+25x", big, " +1234567890abcdef12345")
174 testcommon("%25x", big, " 1234567890abcdef12345")
175 testcommon("%.2x", big, "1234567890abcdef12345")
176 testcommon("%.21x", big, "1234567890abcdef12345")
177 testcommon("%.22x", big, "01234567890abcdef12345")
178 testcommon("%23.22x", big, " 01234567890abcdef12345")
179 testcommon("%-23.22x", big, "01234567890abcdef12345 ")
180 testcommon("%X", big, "1234567890ABCDEF12345")
181 testcommon("%#X", big, "0X1234567890ABCDEF12345")
182 testcommon("%#x", big, "0x1234567890abcdef12345")
183 testcommon("%#x", -big, "-0x1234567890abcdef12345")
184 testcommon("%#27x", big, " 0x1234567890abcdef12345")
185 testcommon("%#-27x", big, "0x1234567890abcdef12345 ")
186 testcommon("%#027x", big, "0x00001234567890abcdef12345")
187 testcommon("%#.23x", big, "0x001234567890abcdef12345")
188 testcommon("%#.23x", -big, "-0x001234567890abcdef12345")
189 testcommon("%#27.23x", big, " 0x001234567890abcdef12345")
190 testcommon("%#-27.23x", big, "0x001234567890abcdef12345 ")
191 testcommon("%#027.23x", big, "0x00001234567890abcdef12345")
192 testcommon("%#+.23x", big, "+0x001234567890abcdef12345")
193 testcommon("%# .23x", big, " 0x001234567890abcdef12345")
194 testcommon("%#+.23X", big, "+0X001234567890ABCDEF12345")
195 # next one gets two leading zeroes from precision, and another from the
196 # 0 flag and the width
197 testcommon("%#+027.23X", big, "+0X0001234567890ABCDEF12345")
198 testcommon("%# 027.23X", big, " 0X0001234567890ABCDEF12345")
199 # same, except no 0 flag
200 testcommon("%#+27.23X", big, " +0X001234567890ABCDEF12345")
201 testcommon("%#-+27.23x", big, "+0x001234567890abcdef12345 ")
202 testcommon("%#- 27.23x", big, " 0x001234567890abcdef12345 ")
203
204 big = 0o12345670123456701234567012345670 # 32 octal digits
205 testcommon("%o", big, "12345670123456701234567012345670")
206 testcommon("%o", -big, "-12345670123456701234567012345670")
207 testcommon("%5o", -big, "-12345670123456701234567012345670")
208 testcommon("%33o", -big, "-12345670123456701234567012345670")
209 testcommon("%34o", -big, " -12345670123456701234567012345670")
210 testcommon("%-34o", -big, "-12345670123456701234567012345670 ")
211 testcommon("%034o", -big, "-012345670123456701234567012345670")
212 testcommon("%-034o", -big, "-12345670123456701234567012345670 ")
213 testcommon("%036o", -big, "-00012345670123456701234567012345670")
214 testcommon("%036o", big, "000012345670123456701234567012345670")
215 testcommon("%0+36o", big, "+00012345670123456701234567012345670")
216 testcommon("%+36o", big, " +12345670123456701234567012345670")
217 testcommon("%36o", big, " 12345670123456701234567012345670")
218 testcommon("%.2o", big, "12345670123456701234567012345670")
219 testcommon("%.32o", big, "12345670123456701234567012345670")
220 testcommon("%.33o", big, "012345670123456701234567012345670")
221 testcommon("%34.33o", big, " 012345670123456701234567012345670")
222 testcommon("%-34.33o", big, "012345670123456701234567012345670 ")
223 testcommon("%o", big, "12345670123456701234567012345670")
224 testcommon("%#o", big, "0o12345670123456701234567012345670")
225 testcommon("%#o", -big, "-0o12345670123456701234567012345670")
226 testcommon("%#38o", big, " 0o12345670123456701234567012345670")
227 testcommon("%#-38o", big, "0o12345670123456701234567012345670 ")
228 testcommon("%#038o", big, "0o000012345670123456701234567012345670")
229 testcommon("%#.34o", big, "0o0012345670123456701234567012345670")
230 testcommon("%#.34o", -big, "-0o0012345670123456701234567012345670")
231 testcommon("%#38.34o", big, " 0o0012345670123456701234567012345670")
232 testcommon("%#-38.34o", big, "0o0012345670123456701234567012345670 ")
233 testcommon("%#038.34o", big, "0o000012345670123456701234567012345670")
234 testcommon("%#+.34o", big, "+0o0012345670123456701234567012345670")
235 testcommon("%# .34o", big, " 0o0012345670123456701234567012345670")
236 testcommon("%#+38.34o", big, " +0o0012345670123456701234567012345670")
237 testcommon("%#-+38.34o", big, "+0o0012345670123456701234567012345670 ")
238 testcommon("%#- 38.34o", big, " 0o0012345670123456701234567012345670 ")
239 testcommon("%#+038.34o", big, "+0o00012345670123456701234567012345670")
240 testcommon("%# 038.34o", big, " 0o00012345670123456701234567012345670")
241 # next one gets one leading zero from precision
242 testcommon("%.33o", big, "012345670123456701234567012345670")
243 # base marker added in spite of leading zero (different to Python 2)
244 testcommon("%#.33o", big, "0o012345670123456701234567012345670")
245 # reduce precision, and base marker is always added
246 testcommon("%#.32o", big, "0o12345670123456701234567012345670")
247 # one leading zero from precision, plus two from "0" flag & width
248 testcommon("%035.33o", big, "00012345670123456701234567012345670")
249 # base marker shouldn't change the size
250 testcommon("%0#35.33o", big, "0o012345670123456701234567012345670")
251
252 # Some small ints, in both Python int and flavors.
253 testcommon("%d", 42, "42")
254 testcommon("%d", -42, "-42")
255 testcommon("%d", 42.0, "42")
256 testcommon("%#x", 1, "0x1")
257 testcommon("%#X", 1, "0X1")
258 testcommon("%#o", 1, "0o1")
259 testcommon("%#o", 0, "0o0")
260 testcommon("%o", 0, "0")
261 testcommon("%d", 0, "0")
262 testcommon("%#x", 0, "0x0")
263 testcommon("%#X", 0, "0X0")
264 testcommon("%x", 0x42, "42")
265 testcommon("%x", -0x42, "-42")
266 testcommon("%o", 0o42, "42")
267 testcommon("%o", -0o42, "-42")
268 # alternate float formatting
269 testcommon('%g', 1.1, '1.1')
270 testcommon('%#g', 1.1, '1.10000')
271
272 if verbose:
273 print('Testing exceptions')
274 test_exc_common('%', (), ValueError, "incomplete format")
275 test_exc_common('% %s', 1, ValueError,
276 "unsupported format character '%' (0x25) at index 2")
277 test_exc_common('%d', '1', TypeError,
278 "%d format: a real number is required, not str")
279 test_exc_common('%d', b'1', TypeError,
280 "%d format: a real number is required, not bytes")
281 test_exc_common('%x', '1', TypeError,
282 "%x format: an integer is required, not str")
283 test_exc_common('%x', 3.14, TypeError,
284 "%x format: an integer is required, not float")
285
286 def test_str_format(self):
287 testformat("%r", "\u0378", "'\\u0378'") # non printable
288 testformat("%a", "\u0378", "'\\u0378'") # non printable
289 testformat("%r", "\u0374", "'\u0374'") # printable
290 testformat("%a", "\u0374", "'\\u0374'") # printable
291
292 # Test exception for unknown format characters, etc.
293 if verbose:
294 print('Testing exceptions')
295 test_exc('abc %b', 1, ValueError,
296 "unsupported format character 'b' (0x62) at index 5")
297 #test_exc(unicode('abc %\u3000','raw-unicode-escape'), 1, ValueError,
298 # "unsupported format character '?' (0x3000) at index 5")
299 test_exc('%g', '1', TypeError, "must be real number, not str")
300 test_exc('no format', '1', TypeError,
301 "not all arguments converted during string formatting")
302 test_exc('%c', -1, OverflowError, "%c arg not in range(0x110000)")
303 test_exc('%c', sys.maxunicode+1, OverflowError,
304 "%c arg not in range(0x110000)")
305 #test_exc('%c', 2**128, OverflowError, "%c arg not in range(0x110000)")
306 test_exc('%c', 3.14, TypeError, "%c requires int or char")
307 test_exc('%c', 'ab', TypeError, "%c requires int or char")
308 test_exc('%c', b'x', TypeError, "%c requires int or char")
309
310 if maxsize == 2**31-1:
311 # crashes 2.2.1 and earlier:
312 try:
313 "%*d"%(maxsize, -127)
314 except MemoryError:
315 pass
316 else:
317 raise TestFailed('"%*d"%(maxsize, -127) should fail')
318
319 def test_bytes_and_bytearray_format(self):
320 # %c will insert a single byte, either from an int in range(256), or
321 # from a bytes argument of length 1, not from a str.
322 testcommon(b"%c", 7, b"\x07")
323 testcommon(b"%c", b"Z", b"Z")
324 testcommon(b"%c", bytearray(b"Z"), b"Z")
325 testcommon(b"%5c", 65, b" A")
326 testcommon(b"%-5c", 65, b"A ")
327 # %b will insert a series of bytes, either from a type that supports
328 # the Py_buffer protocol, or something that has a __bytes__ method
329 class ESC[4;38;5;81mFakeBytes(ESC[4;38;5;149mobject):
330 def __bytes__(self):
331 return b'123'
332 fb = FakeBytes()
333 testcommon(b"%b", b"abc", b"abc")
334 testcommon(b"%b", bytearray(b"def"), b"def")
335 testcommon(b"%b", fb, b"123")
336 testcommon(b"%b", memoryview(b"abc"), b"abc")
337 # # %s is an alias for %b -- should only be used for Py2/3 code
338 testcommon(b"%s", b"abc", b"abc")
339 testcommon(b"%s", bytearray(b"def"), b"def")
340 testcommon(b"%s", fb, b"123")
341 testcommon(b"%s", memoryview(b"abc"), b"abc")
342 # %a will give the equivalent of
343 # repr(some_obj).encode('ascii', 'backslashreplace')
344 testcommon(b"%a", 3.14, b"3.14")
345 testcommon(b"%a", b"ghi", b"b'ghi'")
346 testcommon(b"%a", "jkl", b"'jkl'")
347 testcommon(b"%a", "\u0544", b"'\\u0544'")
348 # %r is an alias for %a
349 testcommon(b"%r", 3.14, b"3.14")
350 testcommon(b"%r", b"ghi", b"b'ghi'")
351 testcommon(b"%r", "jkl", b"'jkl'")
352 testcommon(b"%r", "\u0544", b"'\\u0544'")
353
354 # Test exception for unknown format characters, etc.
355 if verbose:
356 print('Testing exceptions')
357 test_exc(b'%g', '1', TypeError, "float argument required, not str")
358 test_exc(b'%g', b'1', TypeError, "float argument required, not bytes")
359 test_exc(b'no format', 7, TypeError,
360 "not all arguments converted during bytes formatting")
361 test_exc(b'no format', b'1', TypeError,
362 "not all arguments converted during bytes formatting")
363 test_exc(b'no format', bytearray(b'1'), TypeError,
364 "not all arguments converted during bytes formatting")
365 test_exc(b"%c", -1, OverflowError,
366 "%c arg not in range(256)")
367 test_exc(b"%c", 256, OverflowError,
368 "%c arg not in range(256)")
369 test_exc(b"%c", 2**128, OverflowError,
370 "%c arg not in range(256)")
371 test_exc(b"%c", b"Za", TypeError,
372 "%c requires an integer in range(256) or a single byte")
373 test_exc(b"%c", "Y", TypeError,
374 "%c requires an integer in range(256) or a single byte")
375 test_exc(b"%c", 3.14, TypeError,
376 "%c requires an integer in range(256) or a single byte")
377 test_exc(b"%b", "Xc", TypeError,
378 "%b requires a bytes-like object, "
379 "or an object that implements __bytes__, not 'str'")
380 test_exc(b"%s", "Wd", TypeError,
381 "%b requires a bytes-like object, "
382 "or an object that implements __bytes__, not 'str'")
383
384 if maxsize == 2**31-1:
385 # crashes 2.2.1 and earlier:
386 try:
387 "%*d"%(maxsize, -127)
388 except MemoryError:
389 pass
390 else:
391 raise TestFailed('"%*d"%(maxsize, -127) should fail')
392
393 def test_nul(self):
394 # test the null character
395 testcommon("a\0b", (), 'a\0b')
396 testcommon("a%cb", (0,), 'a\0b')
397 testformat("a%sb", ('c\0d',), 'ac\0db')
398 testcommon(b"a%sb", (b'c\0d',), b'ac\0db')
399
400 def test_non_ascii(self):
401 testformat("\u20ac=%f", (1.0,), "\u20ac=1.000000")
402
403 self.assertEqual(format("abc", "\u2007<5"), "abc\u2007\u2007")
404 self.assertEqual(format(123, "\u2007<5"), "123\u2007\u2007")
405 self.assertEqual(format(12.3, "\u2007<6"), "12.3\u2007\u2007")
406 self.assertEqual(format(0j, "\u2007<4"), "0j\u2007\u2007")
407 self.assertEqual(format(1+2j, "\u2007<8"), "(1+2j)\u2007\u2007")
408
409 self.assertEqual(format("abc", "\u2007>5"), "\u2007\u2007abc")
410 self.assertEqual(format(123, "\u2007>5"), "\u2007\u2007123")
411 self.assertEqual(format(12.3, "\u2007>6"), "\u2007\u200712.3")
412 self.assertEqual(format(1+2j, "\u2007>8"), "\u2007\u2007(1+2j)")
413 self.assertEqual(format(0j, "\u2007>4"), "\u2007\u20070j")
414
415 self.assertEqual(format("abc", "\u2007^5"), "\u2007abc\u2007")
416 self.assertEqual(format(123, "\u2007^5"), "\u2007123\u2007")
417 self.assertEqual(format(12.3, "\u2007^6"), "\u200712.3\u2007")
418 self.assertEqual(format(1+2j, "\u2007^8"), "\u2007(1+2j)\u2007")
419 self.assertEqual(format(0j, "\u2007^4"), "\u20070j\u2007")
420
421 def test_locale(self):
422 try:
423 oldloc = locale.setlocale(locale.LC_ALL)
424 locale.setlocale(locale.LC_ALL, '')
425 except locale.Error as err:
426 self.skipTest("Cannot set locale: {}".format(err))
427 try:
428 localeconv = locale.localeconv()
429 sep = localeconv['thousands_sep']
430 point = localeconv['decimal_point']
431 grouping = localeconv['grouping']
432
433 text = format(123456789, "n")
434 if grouping:
435 self.assertIn(sep, text)
436 self.assertEqual(text.replace(sep, ''), '123456789')
437
438 text = format(1234.5, "n")
439 if grouping:
440 self.assertIn(sep, text)
441 self.assertIn(point, text)
442 self.assertEqual(text.replace(sep, ''), '1234' + point + '5')
443 finally:
444 locale.setlocale(locale.LC_ALL, oldloc)
445
446 @support.cpython_only
447 def test_optimisations(self):
448 text = "abcde" # 5 characters
449
450 self.assertIs("%s" % text, text)
451 self.assertIs("%.5s" % text, text)
452 self.assertIs("%.10s" % text, text)
453 self.assertIs("%1s" % text, text)
454 self.assertIs("%5s" % text, text)
455
456 self.assertIs("{0}".format(text), text)
457 self.assertIs("{0:s}".format(text), text)
458 self.assertIs("{0:.5s}".format(text), text)
459 self.assertIs("{0:.10s}".format(text), text)
460 self.assertIs("{0:1s}".format(text), text)
461 self.assertIs("{0:5s}".format(text), text)
462
463 self.assertIs(text % (), text)
464 self.assertIs(text.format(), text)
465
466 def test_precision(self):
467 f = 1.2
468 self.assertEqual(format(f, ".0f"), "1")
469 self.assertEqual(format(f, ".3f"), "1.200")
470 with self.assertRaises(ValueError) as cm:
471 format(f, ".%sf" % (sys.maxsize + 1))
472
473 c = complex(f)
474 self.assertEqual(format(c, ".0f"), "1+0j")
475 self.assertEqual(format(c, ".3f"), "1.200+0.000j")
476 with self.assertRaises(ValueError) as cm:
477 format(c, ".%sf" % (sys.maxsize + 1))
478
479 @support.cpython_only
480 def test_precision_c_limits(self):
481 from _testcapi import INT_MAX
482
483 f = 1.2
484 with self.assertRaises(ValueError) as cm:
485 format(f, ".%sf" % (INT_MAX + 1))
486
487 c = complex(f)
488 with self.assertRaises(ValueError) as cm:
489 format(c, ".%sf" % (INT_MAX + 1))
490
491 def test_g_format_has_no_trailing_zeros(self):
492 # regression test for bugs.python.org/issue40780
493 self.assertEqual("%.3g" % 1505.0, "1.5e+03")
494 self.assertEqual("%#.3g" % 1505.0, "1.50e+03")
495
496 self.assertEqual(format(1505.0, ".3g"), "1.5e+03")
497 self.assertEqual(format(1505.0, "#.3g"), "1.50e+03")
498
499 self.assertEqual(format(12300050.0, ".6g"), "1.23e+07")
500 self.assertEqual(format(12300050.0, "#.6g"), "1.23000e+07")
501
502 def test_with_two_commas_in_format_specifier(self):
503 error_msg = re.escape("Cannot specify ',' with ','.")
504 with self.assertRaisesRegex(ValueError, error_msg):
505 '{:,,}'.format(1)
506
507 def test_with_two_underscore_in_format_specifier(self):
508 error_msg = re.escape("Cannot specify '_' with '_'.")
509 with self.assertRaisesRegex(ValueError, error_msg):
510 '{:__}'.format(1)
511
512 def test_with_a_commas_and_an_underscore_in_format_specifier(self):
513 error_msg = re.escape("Cannot specify both ',' and '_'.")
514 with self.assertRaisesRegex(ValueError, error_msg):
515 '{:,_}'.format(1)
516
517 def test_with_an_underscore_and_a_comma_in_format_specifier(self):
518 error_msg = re.escape("Cannot specify both ',' and '_'.")
519 with self.assertRaisesRegex(ValueError, error_msg):
520 '{:_,}'.format(1)
521
522 def test_better_error_message_format(self):
523 # https://bugs.python.org/issue20524
524 for value in [12j, 12, 12.0, "12"]:
525 with self.subTest(value=value):
526 # The format spec must be invalid for all types we're testing.
527 # '%M' will suffice.
528 bad_format_spec = '%M'
529 err = re.escape("Invalid format specifier "
530 f"'{bad_format_spec}' for object of type "
531 f"'{type(value).__name__}'")
532 with self.assertRaisesRegex(ValueError, err):
533 f"xx{{value:{bad_format_spec}}}yy".format(value=value)
534
535 # Also test the builtin format() function.
536 with self.assertRaisesRegex(ValueError, err):
537 format(value, bad_format_spec)
538
539 # Also test f-strings.
540 with self.assertRaisesRegex(ValueError, err):
541 eval("f'xx{value:{bad_format_spec}}yy'")
542
543 def test_unicode_in_error_message(self):
544 str_err = re.escape(
545 "Invalid format specifier '%ЫйЯЧ' for object of type 'str'")
546 with self.assertRaisesRegex(ValueError, str_err):
547 "{a:%ЫйЯЧ}".format(a='a')
548
549 def test_negative_zero(self):
550 ## default behavior
551 self.assertEqual(f"{-0.:.1f}", "-0.0")
552 self.assertEqual(f"{-.01:.1f}", "-0.0")
553 self.assertEqual(f"{-0:.1f}", "0.0") # integers do not distinguish -0
554
555 ## z sign option
556 self.assertEqual(f"{0.:z.1f}", "0.0")
557 self.assertEqual(f"{0.:z6.1f}", " 0.0")
558 self.assertEqual(f"{-1.:z6.1f}", " -1.0")
559 self.assertEqual(f"{-0.:z.1f}", "0.0")
560 self.assertEqual(f"{.01:z.1f}", "0.0")
561 self.assertEqual(f"{-0:z.1f}", "0.0") # z is allowed for integer input
562 self.assertEqual(f"{-.01:z.1f}", "0.0")
563 self.assertEqual(f"{0.:z.2f}", "0.00")
564 self.assertEqual(f"{-0.:z.2f}", "0.00")
565 self.assertEqual(f"{.001:z.2f}", "0.00")
566 self.assertEqual(f"{-.001:z.2f}", "0.00")
567
568 self.assertEqual(f"{0.:z.1e}", "0.0e+00")
569 self.assertEqual(f"{-0.:z.1e}", "0.0e+00")
570 self.assertEqual(f"{0.:z.1E}", "0.0E+00")
571 self.assertEqual(f"{-0.:z.1E}", "0.0E+00")
572
573 self.assertEqual(f"{-0.001:z.2e}", "-1.00e-03") # tests for mishandled
574 # rounding
575 self.assertEqual(f"{-0.001:z.2g}", "-0.001")
576 self.assertEqual(f"{-0.001:z.2%}", "-0.10%")
577
578 self.assertEqual(f"{-00000.000001:z.1f}", "0.0")
579 self.assertEqual(f"{-00000.:z.1f}", "0.0")
580 self.assertEqual(f"{-.0000000000:z.1f}", "0.0")
581
582 self.assertEqual(f"{-00000.000001:z.2f}", "0.00")
583 self.assertEqual(f"{-00000.:z.2f}", "0.00")
584 self.assertEqual(f"{-.0000000000:z.2f}", "0.00")
585
586 self.assertEqual(f"{.09:z.1f}", "0.1")
587 self.assertEqual(f"{-.09:z.1f}", "-0.1")
588
589 self.assertEqual(f"{-0.: z.0f}", " 0")
590 self.assertEqual(f"{-0.:+z.0f}", "+0")
591 self.assertEqual(f"{-0.:-z.0f}", "0")
592 self.assertEqual(f"{-1.: z.0f}", "-1")
593 self.assertEqual(f"{-1.:+z.0f}", "-1")
594 self.assertEqual(f"{-1.:-z.0f}", "-1")
595
596 self.assertEqual(f"{0.j:z.1f}", "0.0+0.0j")
597 self.assertEqual(f"{-0.j:z.1f}", "0.0+0.0j")
598 self.assertEqual(f"{.01j:z.1f}", "0.0+0.0j")
599 self.assertEqual(f"{-.01j:z.1f}", "0.0+0.0j")
600
601 self.assertEqual(f"{-0.:z>6.1f}", "zz-0.0") # test fill, esp. 'z' fill
602 self.assertEqual(f"{-0.:z>z6.1f}", "zzz0.0")
603 self.assertEqual(f"{-0.:x>z6.1f}", "xxx0.0")
604 self.assertEqual(f"{-0.:🖤>z6.1f}", "🖤🖤🖤0.0") # multi-byte fill char
605
606 def test_specifier_z_error(self):
607 error_msg = re.compile("Invalid format specifier '.*z.*'")
608 with self.assertRaisesRegex(ValueError, error_msg):
609 f"{0:z+f}" # wrong position
610 with self.assertRaisesRegex(ValueError, error_msg):
611 f"{0:fz}" # wrong position
612
613 error_msg = re.escape("Negative zero coercion (z) not allowed")
614 with self.assertRaisesRegex(ValueError, error_msg):
615 f"{0:zd}" # can't apply to int presentation type
616 with self.assertRaisesRegex(ValueError, error_msg):
617 f"{'x':zs}" # can't apply to string
618
619 error_msg = re.escape("unsupported format character 'z'")
620 with self.assertRaisesRegex(ValueError, error_msg):
621 "%z.1f" % 0 # not allowed in old style string interpolation
622 with self.assertRaisesRegex(ValueError, error_msg):
623 b"%z.1f" % 0
624
625
626 if __name__ == "__main__":
627 unittest.main()