feat(timedelta): add scientific notation

changes/3315-JeanArhancet.md

@@ -0,0 +1 @@
+Add scientific notation in timedelta

pydantic/datetime_parse.py

@@ -40,6 +40,8 @@
     r'(?:\.(?P<microseconds>\d{1,6})\d{0,6})?'
     r'$'
 )
+# Support scientific notation for duration
+scientific_notation_duration_re = re.compile(r'^([+\-]?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+\-]?\d+))?$')
 
 # Support the sections of ISO 8601 date representation that are accepted by timedelta
 iso8601_duration_re = re.compile(
@@ -228,6 +230,8 @@ def parse_duration(value: StrBytesIntFloat) -> timedelta:
         value = value.decode()
 
     try:
+        if scientific_notation_duration_re.match(value):
+            value = f"{float(value):.6f}"
         match = standard_duration_re.match(value) or iso8601_duration_re.match(value)
     except TypeError:
         raise TypeError('invalid type; expected timedelta, string, bytes, int or float')

tests/test_datetime_parse.py

@@ -160,6 +160,7 @@ def test_datetime_parsing(value, result):
         timedelta(days=-4, minutes=15, seconds=30),  # negative durations
         timedelta(minutes=15, seconds=30),  # minute & seconds
         timedelta(seconds=30),  # seconds
+        timedelta(microseconds=99)  # microseconds
     ],
 )
 def test_parse_python_format(delta):
@@ -210,6 +211,15 @@ def test_parse_python_format(delta):
         ('PT5S', timedelta(seconds=5)),
         ('PT0.000005S', timedelta(microseconds=5)),
         (b'PT0.000005S', timedelta(microseconds=5)),
+        # Scientific Notation
+        ('+0003', errors.DurationError),
+        (9.9e-05, timedelta(microseconds=99)),
+        ('9.9e-05', timedelta(microseconds=99)),
+        (9.9e05, timedelta(days=11, seconds=39600)),
+        (+3, timedelta(seconds=3)),
+        (-4.70e+9, timedelta(days=-54399, seconds=73600)),
+        (-.2E-4, timedelta(days=-1, seconds=86399, microseconds=999980)),
+        (-7.6603, timedelta(days=-1, seconds=86392, microseconds=339700))
     ],
 )
 def test_parse_durations(value, result):