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diff --git a/lib/python2.7/test/formatfloat_testcases.txt b/lib/python2.7/test/formatfloat_testcases.txt
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--- 'f' code formatting, with explicit precision (>= 0). Output always
--- has the given number of places after the point; zeros are added if
--- necessary to make this true.
-
--- zeros
-%.0f 0 -> 0
-%.1f 0 -> 0.0
-%.2f 0 -> 0.00
-%.3f 0 -> 0.000
-%.50f 0 -> 0.00000000000000000000000000000000000000000000000000
-
--- precision 0; result should never include a .
-%.0f 1.5 -> 2
-%.0f 2.5 -> 2
-%.0f 3.5 -> 4
-%.0f 0.0 -> 0
-%.0f 0.1 -> 0
-%.0f 0.001 -> 0
-%.0f 10.0 -> 10
-%.0f 10.1 -> 10
-%.0f 10.01 -> 10
-%.0f 123.456 -> 123
-%.0f 1234.56 -> 1235
-%.0f 1e49 -> 9999999999999999464902769475481793196872414789632
-%.0f 9.9999999999999987e+49 -> 99999999999999986860582406952576489172979654066176
-%.0f 1e50 -> 100000000000000007629769841091887003294964970946560
-
--- precision 1
-%.1f 0.0001 -> 0.0
-%.1f 0.001 -> 0.0
-%.1f 0.01 -> 0.0
-%.1f 0.04 -> 0.0
-%.1f 0.06 -> 0.1
-%.1f 0.25 -> 0.2
-%.1f 0.75 -> 0.8
-%.1f 1.4 -> 1.4
-%.1f 1.5 -> 1.5
-%.1f 10.0 -> 10.0
-%.1f 1000.03 -> 1000.0
-%.1f 1234.5678 -> 1234.6
-%.1f 1234.7499 -> 1234.7
-%.1f 1234.75 -> 1234.8
-
--- precision 2
-%.2f 0.0001 -> 0.00
-%.2f 0.001 -> 0.00
-%.2f 0.004999 -> 0.00
-%.2f 0.005001 -> 0.01
-%.2f 0.01 -> 0.01
-%.2f 0.125 -> 0.12
-%.2f 0.375 -> 0.38
-%.2f 1234500 -> 1234500.00
-%.2f 1234560 -> 1234560.00
-%.2f 1234567 -> 1234567.00
-%.2f 1234567.8 -> 1234567.80
-%.2f 1234567.89 -> 1234567.89
-%.2f 1234567.891 -> 1234567.89
-%.2f 1234567.8912 -> 1234567.89
-
--- alternate form always includes a decimal point. This only
--- makes a difference when the precision is 0.
-%#.0f 0 -> 0.
-%#.1f 0 -> 0.0
-%#.0f 1.5 -> 2.
-%#.0f 2.5 -> 2.
-%#.0f 10.1 -> 10.
-%#.0f 1234.56 -> 1235.
-%#.1f 1.4 -> 1.4
-%#.2f 0.375 -> 0.38
-
--- if precision is omitted it defaults to 6
-%f 0 -> 0.000000
-%f 1230000 -> 1230000.000000
-%f 1234567 -> 1234567.000000
-%f 123.4567 -> 123.456700
-%f 1.23456789 -> 1.234568
-%f 0.00012 -> 0.000120
-%f 0.000123 -> 0.000123
-%f 0.00012345 -> 0.000123
-%f 0.000001 -> 0.000001
-%f 0.0000005001 -> 0.000001
-%f 0.0000004999 -> 0.000000
-
--- nans and infinities
-%f nan -> nan
-%f inf -> inf
-%f -infinity -> -inf
-%F nan -> NAN
-%F infinity -> INF
-%F -inf -> -INF
-
--- 'e' code formatting with explicit precision (>= 0). Output should
--- always have exactly the number of places after the point that were
--- requested.
-
--- zeros
-%.0e 0 -> 0e+00
-%.1e 0 -> 0.0e+00
-%.2e 0 -> 0.00e+00
-%.10e 0 -> 0.0000000000e+00
-%.50e 0 -> 0.00000000000000000000000000000000000000000000000000e+00
-
--- precision 0. no decimal point in the output
-%.0e 0.01 -> 1e-02
-%.0e 0.1 -> 1e-01
-%.0e 1 -> 1e+00
-%.0e 10 -> 1e+01
-%.0e 100 -> 1e+02
-%.0e 0.012 -> 1e-02
-%.0e 0.12 -> 1e-01
-%.0e 1.2 -> 1e+00
-%.0e 12 -> 1e+01
-%.0e 120 -> 1e+02
-%.0e 123.456 -> 1e+02
-%.0e 0.000123456 -> 1e-04
-%.0e 123456000 -> 1e+08
-%.0e 0.5 -> 5e-01
-%.0e 1.4 -> 1e+00
-%.0e 1.5 -> 2e+00
-%.0e 1.6 -> 2e+00
-%.0e 2.4999999 -> 2e+00
-%.0e 2.5 -> 2e+00
-%.0e 2.5000001 -> 3e+00
-%.0e 3.499999999999 -> 3e+00
-%.0e 3.5 -> 4e+00
-%.0e 4.5 -> 4e+00
-%.0e 5.5 -> 6e+00
-%.0e 6.5 -> 6e+00
-%.0e 7.5 -> 8e+00
-%.0e 8.5 -> 8e+00
-%.0e 9.4999 -> 9e+00
-%.0e 9.5 -> 1e+01
-%.0e 10.5 -> 1e+01
-%.0e 14.999 -> 1e+01
-%.0e 15 -> 2e+01
-
--- precision 1
-%.1e 0.0001 -> 1.0e-04
-%.1e 0.001 -> 1.0e-03
-%.1e 0.01 -> 1.0e-02
-%.1e 0.1 -> 1.0e-01
-%.1e 1 -> 1.0e+00
-%.1e 10 -> 1.0e+01
-%.1e 100 -> 1.0e+02
-%.1e 120 -> 1.2e+02
-%.1e 123 -> 1.2e+02
-%.1e 123.4 -> 1.2e+02
-
--- precision 2
-%.2e 0.00013 -> 1.30e-04
-%.2e 0.000135 -> 1.35e-04
-%.2e 0.0001357 -> 1.36e-04
-%.2e 0.0001 -> 1.00e-04
-%.2e 0.001 -> 1.00e-03
-%.2e 0.01 -> 1.00e-02
-%.2e 0.1 -> 1.00e-01
-%.2e 1 -> 1.00e+00
-%.2e 10 -> 1.00e+01
-%.2e 100 -> 1.00e+02
-%.2e 1000 -> 1.00e+03
-%.2e 1500 -> 1.50e+03
-%.2e 1590 -> 1.59e+03
-%.2e 1598 -> 1.60e+03
-%.2e 1598.7 -> 1.60e+03
-%.2e 1598.76 -> 1.60e+03
-%.2e 9999 -> 1.00e+04
-
--- omitted precision defaults to 6
-%e 0 -> 0.000000e+00
-%e 165 -> 1.650000e+02
-%e 1234567 -> 1.234567e+06
-%e 12345678 -> 1.234568e+07
-%e 1.1 -> 1.100000e+00
-
--- alternate form always contains a decimal point. This only makes
--- a difference when precision is 0.
-
-%#.0e 0.01 -> 1.e-02
-%#.0e 0.1 -> 1.e-01
-%#.0e 1 -> 1.e+00
-%#.0e 10 -> 1.e+01
-%#.0e 100 -> 1.e+02
-%#.0e 0.012 -> 1.e-02
-%#.0e 0.12 -> 1.e-01
-%#.0e 1.2 -> 1.e+00
-%#.0e 12 -> 1.e+01
-%#.0e 120 -> 1.e+02
-%#.0e 123.456 -> 1.e+02
-%#.0e 0.000123456 -> 1.e-04
-%#.0e 123456000 -> 1.e+08
-%#.0e 0.5 -> 5.e-01
-%#.0e 1.4 -> 1.e+00
-%#.0e 1.5 -> 2.e+00
-%#.0e 1.6 -> 2.e+00
-%#.0e 2.4999999 -> 2.e+00
-%#.0e 2.5 -> 2.e+00
-%#.0e 2.5000001 -> 3.e+00
-%#.0e 3.499999999999 -> 3.e+00
-%#.0e 3.5 -> 4.e+00
-%#.0e 4.5 -> 4.e+00
-%#.0e 5.5 -> 6.e+00
-%#.0e 6.5 -> 6.e+00
-%#.0e 7.5 -> 8.e+00
-%#.0e 8.5 -> 8.e+00
-%#.0e 9.4999 -> 9.e+00
-%#.0e 9.5 -> 1.e+01
-%#.0e 10.5 -> 1.e+01
-%#.0e 14.999 -> 1.e+01
-%#.0e 15 -> 2.e+01
-%#.1e 123.4 -> 1.2e+02
-%#.2e 0.0001357 -> 1.36e-04
-
--- nans and infinities
-%e nan -> nan
-%e inf -> inf
-%e -infinity -> -inf
-%E nan -> NAN
-%E infinity -> INF
-%E -inf -> -INF
-
--- 'g' code formatting.
-
--- zeros
-%.0g 0 -> 0
-%.1g 0 -> 0
-%.2g 0 -> 0
-%.3g 0 -> 0
-%.4g 0 -> 0
-%.10g 0 -> 0
-%.50g 0 -> 0
-%.100g 0 -> 0
-
--- precision 0 doesn't make a lot of sense for the 'g' code (what does
--- it mean to have no significant digits?); in practice, it's interpreted
--- as identical to precision 1
-%.0g 1000 -> 1e+03
-%.0g 100 -> 1e+02
-%.0g 10 -> 1e+01
-%.0g 1 -> 1
-%.0g 0.1 -> 0.1
-%.0g 0.01 -> 0.01
-%.0g 1e-3 -> 0.001
-%.0g 1e-4 -> 0.0001
-%.0g 1e-5 -> 1e-05
-%.0g 1e-6 -> 1e-06
-%.0g 12 -> 1e+01
-%.0g 120 -> 1e+02
-%.0g 1.2 -> 1
-%.0g 0.12 -> 0.1
-%.0g 0.012 -> 0.01
-%.0g 0.0012 -> 0.001
-%.0g 0.00012 -> 0.0001
-%.0g 0.000012 -> 1e-05
-%.0g 0.0000012 -> 1e-06
-
--- precision 1 identical to precision 0
-%.1g 1000 -> 1e+03
-%.1g 100 -> 1e+02
-%.1g 10 -> 1e+01
-%.1g 1 -> 1
-%.1g 0.1 -> 0.1
-%.1g 0.01 -> 0.01
-%.1g 1e-3 -> 0.001
-%.1g 1e-4 -> 0.0001
-%.1g 1e-5 -> 1e-05
-%.1g 1e-6 -> 1e-06
-%.1g 12 -> 1e+01
-%.1g 120 -> 1e+02
-%.1g 1.2 -> 1
-%.1g 0.12 -> 0.1
-%.1g 0.012 -> 0.01
-%.1g 0.0012 -> 0.001
-%.1g 0.00012 -> 0.0001
-%.1g 0.000012 -> 1e-05
-%.1g 0.0000012 -> 1e-06
-
--- precision 2
-%.2g 1000 -> 1e+03
-%.2g 100 -> 1e+02
-%.2g 10 -> 10
-%.2g 1 -> 1
-%.2g 0.1 -> 0.1
-%.2g 0.01 -> 0.01
-%.2g 0.001 -> 0.001
-%.2g 1e-4 -> 0.0001
-%.2g 1e-5 -> 1e-05
-%.2g 1e-6 -> 1e-06
-%.2g 1234 -> 1.2e+03
-%.2g 123 -> 1.2e+02
-%.2g 12.3 -> 12
-%.2g 1.23 -> 1.2
-%.2g 0.123 -> 0.12
-%.2g 0.0123 -> 0.012
-%.2g 0.00123 -> 0.0012
-%.2g 0.000123 -> 0.00012
-%.2g 0.0000123 -> 1.2e-05
-
--- alternate g formatting: always include decimal point and
--- exactly <precision> significant digits.
-%#.0g 0 -> 0.
-%#.1g 0 -> 0.
-%#.2g 0 -> 0.0
-%#.3g 0 -> 0.00
-%#.4g 0 -> 0.000
-
-%#.0g 0.2 -> 0.2
-%#.1g 0.2 -> 0.2
-%#.2g 0.2 -> 0.20
-%#.3g 0.2 -> 0.200
-%#.4g 0.2 -> 0.2000
-%#.10g 0.2 -> 0.2000000000
-
-%#.0g 2 -> 2.
-%#.1g 2 -> 2.
-%#.2g 2 -> 2.0
-%#.3g 2 -> 2.00
-%#.4g 2 -> 2.000
-
-%#.0g 20 -> 2.e+01
-%#.1g 20 -> 2.e+01
-%#.2g 20 -> 20.
-%#.3g 20 -> 20.0
-%#.4g 20 -> 20.00
-
-%#.0g 234.56 -> 2.e+02
-%#.1g 234.56 -> 2.e+02
-%#.2g 234.56 -> 2.3e+02
-%#.3g 234.56 -> 235.
-%#.4g 234.56 -> 234.6
-%#.5g 234.56 -> 234.56
-%#.6g 234.56 -> 234.560
-
--- nans and infinities
-%g nan -> nan
-%g inf -> inf
-%g -infinity -> -inf
-%G nan -> NAN
-%G infinity -> INF
-%G -inf -> -INF
-
--- for repr formatting see the separate test_short_repr test in
--- test_float.py. Not all platforms use short repr for floats.
-
--- str formatting. Result always includes decimal point and at
--- least one digit after the point, or an exponent.
-%s 0 -> 0.0
-%s 1 -> 1.0
-
-%s 0.01 -> 0.01
-%s 0.02 -> 0.02
-%s 0.03 -> 0.03
-%s 0.04 -> 0.04
-%s 0.05 -> 0.05
-
--- str truncates to 12 significant digits
-%s 1.234123412341 -> 1.23412341234
-%s 1.23412341234 -> 1.23412341234
-%s 1.2341234123 -> 1.2341234123
-
--- values >= 1e11 get an exponent
-%s 10 -> 10.0
-%s 100 -> 100.0
-%s 1e10 -> 10000000000.0
-%s 9.999e10 -> 99990000000.0
-%s 99999999999 -> 99999999999.0
-%s 99999999999.9 -> 99999999999.9
-%s 99999999999.99 -> 1e+11
-%s 1e11 -> 1e+11
-%s 1e12 -> 1e+12
-
--- as do values < 1e-4
-%s 1e-3 -> 0.001
-%s 1.001e-4 -> 0.0001001
-%s 1.000000000001e-4 -> 0.0001
-%s 1.00000000001e-4 -> 0.000100000000001
-%s 1.0000000001e-4 -> 0.00010000000001
-%s 1e-4 -> 0.0001
-%s 0.999999999999e-4 -> 9.99999999999e-05
-%s 0.999e-4 -> 9.99e-05
-%s 1e-5 -> 1e-05