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Issue 33084: [issue1580] Use shorter float repr when possible (Closed) Base URL: http://svn.python.org/view/*checkout*/python/branches/py3k/
Patch Set: Include fallback code; fixed SSE2 detection Created 14 years, 11 months ago
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1 -- 'f' code formatting, with explicit precision (>= 0). Output always
2 -- has the given number of places after the point; zeros are added if
3 -- necessary to make this true.
4
5 -- zeros
6 %.0f 0 -> 0
7 %.1f 0 -> 0.0
8 %.2f 0 -> 0.00
9 %.3f 0 -> 0.000
10 %.50f 0 -> 0.00000000000000000000000000000000000000000000000000
11
12 -- precision 0; result should never include a .
13 %.0f 1.5 -> 2
14 %.0f 2.5 -> 2
15 %.0f 3.5 -> 4
16 %.0f 0.0 -> 0
17 %.0f 0.1 -> 0
18 %.0f 0.001 -> 0
19 %.0f 10.0 -> 10
20 %.0f 10.1 -> 10
21 %.0f 10.01 -> 10
22 %.0f 123.456 -> 123
23 %.0f 1234.56 -> 1235
24 %.0f 1e49 -> 9999999999999999464902769475481793196872414789632
25 -- %.0f 1e50 -> 100000000000000007629769841091887003294964970946560
26 %.0f 9.9999999999999987e+49 -> 9999999999999998686058240695257648917297965406617 6
27
28 -- precision 1
29 %.1f 0.0001 -> 0.0
30 %.1f 0.001 -> 0.0
31 %.1f 0.01 -> 0.0
32 %.1f 0.04 -> 0.0
33 %.1f 0.06 -> 0.1
34 %.1f 0.25 -> 0.2
35 %.1f 0.75 -> 0.8
36 %.1f 1.4 -> 1.4
37 %.1f 1.5 -> 1.5
38 %.1f 10.0 -> 10.0
39 %.1f 1000.03 -> 1000.0
40 %.1f 1234.5678 -> 1234.6
41 %.1f 1234.7499 -> 1234.7
42 %.1f 1234.75 -> 1234.8
43
44 -- precision 2
45 %.2f 0.0001 -> 0.00
46 %.2f 0.001 -> 0.00
47 %.2f 0.004999 -> 0.00
48 %.2f 0.005001 -> 0.01
49 %.2f 0.01 -> 0.01
50 %.2f 0.125 -> 0.12
51 %.2f 0.375 -> 0.38
52 %.2f 1234500 -> 1234500.00
53 %.2f 1234560 -> 1234560.00
54 %.2f 1234567 -> 1234567.00
55 %.2f 1234567.8 -> 1234567.80
56 %.2f 1234567.89 -> 1234567.89
57 %.2f 1234567.891 -> 1234567.89
58 %.2f 1234567.8912 -> 1234567.89
59
60 -- alternate form always includes a decimal point. This only
61 -- makes a difference when the precision is 0.
62 %#.0f 0 -> 0.
63 %#.1f 0 -> 0.0
64 %#.0f 1.5 -> 2.
65 %#.0f 2.5 -> 2.
66 %#.0f 10.1 -> 10.
67 %#.0f 1234.56 -> 1235.
68 %#.1f 1.4 -> 1.4
69 %#.2f 0.375 -> 0.38
70
71 -- if precision is omitted it defaults to 6
72 %f 0 -> 0.000000
73 %f 1230000 -> 1230000.000000
74 %f 1234567 -> 1234567.000000
75 %f 123.4567 -> 123.456700
76 %f 1.23456789 -> 1.234568
77 %f 0.00012 -> 0.000120
78 %f 0.000123 -> 0.000123
79 %f 0.00012345 -> 0.000123
80 %f 0.000001 -> 0.000001
81 %f 0.0000005001 -> 0.000001
82 %f 0.0000004999 -> 0.000000
83
84 -- 'e' code formatting with explicit precision (>= 0). Output should
85 -- always have exactly the number of places after the point that were
86 -- requested.
87
88 -- zeros
89 %.0e 0 -> 0e+00
90 %.1e 0 -> 0.0e+00
91 %.2e 0 -> 0.00e+00
92 %.10e 0 -> 0.0000000000e+00
93 %.50e 0 -> 0.00000000000000000000000000000000000000000000000000e+00
94
95 -- precision 0. no decimal point in the output
96 %.0e 0.01 -> 1e-02
97 %.0e 0.1 -> 1e-01
98 %.0e 1 -> 1e+00
99 %.0e 10 -> 1e+01
100 %.0e 100 -> 1e+02
101 %.0e 0.012 -> 1e-02
102 %.0e 0.12 -> 1e-01
103 %.0e 1.2 -> 1e+00
104 %.0e 12 -> 1e+01
105 %.0e 120 -> 1e+02
106 %.0e 123.456 -> 1e+02
107 %.0e 0.000123456 -> 1e-04
108 %.0e 123456000 -> 1e+08
109 %.0e 0.5 -> 5e-01
110 %.0e 1.4 -> 1e+00
111 %.0e 1.5 -> 2e+00
112 %.0e 1.6 -> 2e+00
113 %.0e 2.4999999 -> 2e+00
114 %.0e 2.5 -> 2e+00
115 %.0e 2.5000001 -> 3e+00
116 %.0e 3.499999999999 -> 3e+00
117 %.0e 3.5 -> 4e+00
118 %.0e 4.5 -> 4e+00
119 %.0e 5.5 -> 6e+00
120 %.0e 6.5 -> 6e+00
121 %.0e 7.5 -> 8e+00
122 %.0e 8.5 -> 8e+00
123 %.0e 9.4999 -> 9e+00
124 %.0e 9.5 -> 1e+01
125 %.0e 10.5 -> 1e+01
126 %.0e 14.999 -> 1e+01
127 %.0e 15 -> 2e+01
128
129 -- precision 1
130 %.1e 0.0001 -> 1.0e-04
131 %.1e 0.001 -> 1.0e-03
132 %.1e 0.01 -> 1.0e-02
133 %.1e 0.1 -> 1.0e-01
134 %.1e 1 -> 1.0e+00
135 %.1e 10 -> 1.0e+01
136 %.1e 100 -> 1.0e+02
137 %.1e 120 -> 1.2e+02
138 %.1e 123 -> 1.2e+02
139 %.1e 123.4 -> 1.2e+02
140
141 -- precision 2
142 %.2e 0.00013 -> 1.30e-04
143 %.2e 0.000135 -> 1.35e-04
144 %.2e 0.0001357 -> 1.36e-04
145 %.2e 0.0001 -> 1.00e-04
146 %.2e 0.001 -> 1.00e-03
147 %.2e 0.01 -> 1.00e-02
148 %.2e 0.1 -> 1.00e-01
149 %.2e 1 -> 1.00e+00
150 %.2e 10 -> 1.00e+01
151 %.2e 100 -> 1.00e+02
152 %.2e 1000 -> 1.00e+03
153 %.2e 1500 -> 1.50e+03
154 %.2e 1590 -> 1.59e+03
155 %.2e 1598 -> 1.60e+03
156 %.2e 1598.7 -> 1.60e+03
157 %.2e 1598.76 -> 1.60e+03
158 %.2e 9999 -> 1.00e+04
159
160 -- omitted precision defaults to 6
161 %e 0 -> 0.000000e+00
162 %e 165 -> 1.650000e+02
163 %e 1234567 -> 1.234567e+06
164 %e 12345678 -> 1.234568e+07
165 %e 1.1 -> 1.100000e+00
166
167 -- alternate form always contains a decimal point. This only makes
168 -- a difference when precision is 0.
169
170 %#.0e 0.01 -> 1.e-02
171 %#.0e 0.1 -> 1.e-01
172 %#.0e 1 -> 1.e+00
173 %#.0e 10 -> 1.e+01
174 %#.0e 100 -> 1.e+02
175 %#.0e 0.012 -> 1.e-02
176 %#.0e 0.12 -> 1.e-01
177 %#.0e 1.2 -> 1.e+00
178 %#.0e 12 -> 1.e+01
179 %#.0e 120 -> 1.e+02
180 %#.0e 123.456 -> 1.e+02
181 %#.0e 0.000123456 -> 1.e-04
182 %#.0e 123456000 -> 1.e+08
183 %#.0e 0.5 -> 5.e-01
184 %#.0e 1.4 -> 1.e+00
185 %#.0e 1.5 -> 2.e+00
186 %#.0e 1.6 -> 2.e+00
187 %#.0e 2.4999999 -> 2.e+00
188 %#.0e 2.5 -> 2.e+00
189 %#.0e 2.5000001 -> 3.e+00
190 %#.0e 3.499999999999 -> 3.e+00
191 %#.0e 3.5 -> 4.e+00
192 %#.0e 4.5 -> 4.e+00
193 %#.0e 5.5 -> 6.e+00
194 %#.0e 6.5 -> 6.e+00
195 %#.0e 7.5 -> 8.e+00
196 %#.0e 8.5 -> 8.e+00
197 %#.0e 9.4999 -> 9.e+00
198 %#.0e 9.5 -> 1.e+01
199 %#.0e 10.5 -> 1.e+01
200 %#.0e 14.999 -> 1.e+01
201 %#.0e 15 -> 2.e+01
202 %#.1e 123.4 -> 1.2e+02
203 %#.2e 0.0001357 -> 1.36e-04
204
205 -- 'g' code formatting.
206
207 -- zeros
208 %.0g 0 -> 0
209 %.1g 0 -> 0
210 %.2g 0 -> 0
211 %.3g 0 -> 0
212 %.4g 0 -> 0
213 %.10g 0 -> 0
214 %.50g 0 -> 0
215 %.100g 0 -> 0
216
217 -- precision 0 doesn't make a lot of sense for the 'g' code (what does
218 -- it mean to have no significant digits?); in practice, it's interpreted
219 -- as identical to precision 1
220 %.0g 1000 -> 1e+03
221 %.0g 100 -> 1e+02
222 %.0g 10 -> 1e+01
223 %.0g 1 -> 1
224 %.0g 0.1 -> 0.1
225 %.0g 0.01 -> 0.01
226 %.0g 1e-3 -> 0.001
227 %.0g 1e-4 -> 0.0001
228 %.0g 1e-5 -> 1e-05
229 %.0g 1e-6 -> 1e-06
230 %.0g 12 -> 1e+01
231 %.0g 120 -> 1e+02
232 %.0g 1.2 -> 1
233 %.0g 0.12 -> 0.1
234 %.0g 0.012 -> 0.01
235 %.0g 0.0012 -> 0.001
236 %.0g 0.00012 -> 0.0001
237 %.0g 0.000012 -> 1e-05
238 %.0g 0.0000012 -> 1e-06
239
240 -- precision 1 identical to precision 0
241 %.1g 1000 -> 1e+03
242 %.1g 100 -> 1e+02
243 %.1g 10 -> 1e+01
244 %.1g 1 -> 1
245 %.1g 0.1 -> 0.1
246 %.1g 0.01 -> 0.01
247 %.1g 1e-3 -> 0.001
248 %.1g 1e-4 -> 0.0001
249 %.1g 1e-5 -> 1e-05
250 %.1g 1e-6 -> 1e-06
251 %.1g 12 -> 1e+01
252 %.1g 120 -> 1e+02
253 %.1g 1.2 -> 1
254 %.1g 0.12 -> 0.1
255 %.1g 0.012 -> 0.01
256 %.1g 0.0012 -> 0.001
257 %.1g 0.00012 -> 0.0001
258 %.1g 0.000012 -> 1e-05
259 %.1g 0.0000012 -> 1e-06
260
261 -- precision 2
262 %.2g 1000 -> 1e+03
263 %.2g 100 -> 1e+02
264 %.2g 10 -> 10
265 %.2g 1 -> 1
266 %.2g 0.1 -> 0.1
267 %.2g 0.01 -> 0.01
268 %.2g 0.001 -> 0.001
269 %.2g 1e-4 -> 0.0001
270 %.2g 1e-5 -> 1e-05
271 %.2g 1e-6 -> 1e-06
272 %.2g 1234 -> 1.2e+03
273 %.2g 123 -> 1.2e+02
274 %.2g 12.3 -> 12
275 %.2g 1.23 -> 1.2
276 %.2g 0.123 -> 0.12
277 %.2g 0.0123 -> 0.012
278 %.2g 0.00123 -> 0.0012
279 %.2g 0.000123 -> 0.00012
280 %.2g 0.0000123 -> 1.2e-05
281
282 -- alternate g formatting: always include decimal point and
283 -- exactly <precision> significant digits.
284 %#.0g 0 -> 0.
285 %#.1g 0 -> 0.
286 %#.2g 0 -> 0.0
287 %#.3g 0 -> 0.00
288 %#.4g 0 -> 0.000
289
290 %#.0g 0.2 -> 0.2
291 %#.1g 0.2 -> 0.2
292 %#.2g 0.2 -> 0.20
293 %#.3g 0.2 -> 0.200
294 %#.4g 0.2 -> 0.2000
295 %#.10g 0.2 -> 0.2000000000
296
297 %#.0g 2 -> 2.
298 %#.1g 2 -> 2.
299 %#.2g 2 -> 2.0
300 %#.3g 2 -> 2.00
301 %#.4g 2 -> 2.000
302
303 %#.0g 20 -> 2.e+01
304 %#.1g 20 -> 2.e+01
305 %#.2g 20 -> 20.
306 %#.3g 20 -> 20.0
307 %#.4g 20 -> 20.00
308
309 %#.0g 234.56 -> 2.e+02
310 %#.1g 234.56 -> 2.e+02
311 %#.2g 234.56 -> 2.3e+02
312 %#.3g 234.56 -> 235.
313 %#.4g 234.56 -> 234.6
314 %#.5g 234.56 -> 234.56
315 %#.6g 234.56 -> 234.560
316
317 -- for repr formatting see the separate test_short_repr test in
318 -- test_float.py. Not all platforms use short repr for floats.
319
320 -- str formatting. Result always includes decimal point and at
321 -- least one digit after the point, or an exponent.
322 %s 0 -> 0.0
323 %s 1 -> 1.0
324
325 %s 0.01 -> 0.01
326 %s 0.02 -> 0.02
327 %s 0.03 -> 0.03
328 %s 0.04 -> 0.04
329 %s 0.05 -> 0.05
330
331 -- str truncates to 12 significant digits
332 %s 1.234123412341 -> 1.23412341234
333 %s 1.23412341234 -> 1.23412341234
334 %s 1.2341234123 -> 1.2341234123
335
336 -- values >= 1e11 get an exponent
337 %s 10 -> 10.0
338 %s 100 -> 100.0
339 %s 1e10 -> 10000000000.0
340 %s 9.999e10 -> 99990000000.0
341 %s 99999999999 -> 99999999999.0
342 %s 1e11 -> 1e+11
343 %s 1e12 -> 1e+12
344
345 -- as do values < 1e-4
346 %s 1e-3 -> 0.001
347 %s 1.001e-4 -> 0.0001001
348 %s 1.000000000001e-4 -> 0.0001
349 %s 1.00000000001e-4 -> 0.000100000000001
350 %s 1.0000000001e-4 -> 0.00010000000001
351 %s 1e-4 -> 0.0001
352 %s 0.999999999999e-4 -> 9.99999999999e-05
353 %s 0.999e-4 -> 9.99e-05
354 %s 1e-5 -> 1e-05
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