Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_fpformat.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 614c84670c63
children
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1 '''
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2 Tests for fpformat module
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3 Nick Mathewson
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4 '''
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5 from test.test_support import run_unittest, import_module
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6 import unittest
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7 fpformat = import_module('fpformat', deprecated=True)
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8 fix, sci, NotANumber = fpformat.fix, fpformat.sci, fpformat.NotANumber
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9
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10 StringType = type('')
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11
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12 # Test the old and obsolescent fpformat module.
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13 #
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14 # (It's obsolescent because fix(n,d) == "%.*f"%(d,n) and
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15 # sci(n,d) == "%.*e"%(d,n)
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16 # for all reasonable numeric n and d, except that sci gives 3 exponent
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17 # digits instead of 2.
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18 #
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19 # Differences only occur for unreasonable n and d. <.2 wink>)
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20
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21 class FpformatTest(unittest.TestCase):
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22
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23 def checkFix(self, n, digits):
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24 result = fix(n, digits)
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25 if isinstance(n, StringType):
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26 n = repr(n)
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27 expected = "%.*f" % (digits, float(n))
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28
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29 self.assertEqual(result, expected)
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30
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31 def checkSci(self, n, digits):
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32 result = sci(n, digits)
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33 if isinstance(n, StringType):
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34 n = repr(n)
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35 expected = "%.*e" % (digits, float(n))
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36 # add the extra 0 if needed
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37 num, exp = expected.split("e")
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38 if len(exp) < 4:
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39 exp = exp[0] + "0" + exp[1:]
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40 expected = "%se%s" % (num, exp)
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41
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42 self.assertEqual(result, expected)
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43
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44 def test_basic_cases(self):
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45 self.assertEqual(fix(100.0/3, 3), '33.333')
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46 self.assertEqual(sci(100.0/3, 3), '3.333e+001')
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47
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48 def test_reasonable_values(self):
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49 for d in range(7):
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50 for val in (1000.0/3, 1000, 1000.0, .002, 1.0/3, 1e10):
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51 for realVal in (val, 1.0/val, -val, -1.0/val):
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52 self.checkFix(realVal, d)
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53 self.checkSci(realVal, d)
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54
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55 def test_failing_values(self):
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56 # Now for 'unreasonable n and d'
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57 self.assertEqual(fix(1.0, 1000), '1.'+('0'*1000))
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58 self.assertEqual(sci("1"+('0'*1000), 0), '1e+1000')
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59
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60 # This behavior is inconsistent. sci raises an exception; fix doesn't.
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61 yacht = "Throatwobbler Mangrove"
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62 self.assertEqual(fix(yacht, 10), yacht)
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63 try:
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64 sci(yacht, 10)
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65 except NotANumber:
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66 pass
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67 else:
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68 self.fail("No exception on non-numeric sci")
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69
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71 def test_main():
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72 run_unittest(FpformatTest)
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75 if __name__ == "__main__":
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76 test_main()