Attempted fix for scientic notation parsing

2 files changed, 12 insertions, 1 deletions

diff --git a/_test/test_float.py b/_test/test_float.py
index f9d060d..3fda083 100644
--- a/_test/test_float.py
+++ b/_test/test_float.py
@@ -134,6 +134,17 @@ class TestFloat:
         - 250e6
         """)
 
+    def test_round_trip_exp_05(self):
+        data = round_trip("""\
+        - 3.0517578123e-56
+        - 3.0517578123E-56
+        - 3.0517578123e-056
+        - 3.0517578123E-056
+        """)
+        print(data)
+        for d in data:
+            assert 3.0517578122e-56 < d < 3.0517578124e-56
+            
     def test_yaml_1_1_no_dot(self):
         with pytest.warns(MantissaNoDotYAML1_1Warning):
             round_trip_load("""\
diff --git a/representer.py b/representer.py
index 25e53b9..9163637 100644
--- a/representer.py
+++ b/representer.py
@@ -782,7 +782,7 @@ class RoundTripRepresenter(SafeRepresenter):
                 value += u'0'
         else:
             # exponent
-            m, es = u'{:{}e}'.format(data, data._width).split('e')
+            m, es = u'{:{}.{}e}'.format(data, data._width, data._width - data._prec).split('e')
             w = data._width if data._prec > 0 else (data._width + 1)
             if data < 0:
                 w += 1