feat(timedelta): add scientific notation

changes/3315-JeanArhancet.md

@@ -0,0 +1 @@
+Allow scientific notation for numbers in timedelta fields

pydantic/datetime_parse.py

@@ -54,6 +54,9 @@
     r'$'
 )
 
+# Support scientific notation
+scientific_notation = re.compile(r'^(?P<sign>[-+]?)(?P<scientific_notation>\d+(.\d+)?[eE][+\-]?\d+)?$')
+
 EPOCH = datetime(1970, 1, 1)
 # if greater than this, the number is in ms, if less than or equal it's in seconds
 # (in seconds this is 11th October 2603, in ms it's 20th August 1970)
@@ -228,7 +231,9 @@ def parse_duration(value: StrBytesIntFloat) -> timedelta:
         value = value.decode()
 
     try:
-        match = standard_duration_re.match(value) or iso8601_duration_re.match(value)
+        match = (
+            standard_duration_re.match(value) or iso8601_duration_re.match(value) or scientific_notation.match(value)
+        )
     except TypeError:
         raise TypeError('invalid type; expected timedelta, string, bytes, int or float')
 
@@ -243,6 +248,10 @@ def parse_duration(value: StrBytesIntFloat) -> timedelta:
     if kw.get('seconds') and kw.get('microseconds') and kw['seconds'].startswith('-'):
         kw['microseconds'] = '-' + kw['microseconds']
 
+    if kw.get('scientific_notation'):
+        # convert scientific notation to decimals
+        kw['seconds'] = '{:.8s}'.format(kw.pop('scientific_notation'))
+
     kw_ = {k: float(v) for k, v in kw.items() if v is not None}
 
     return sign * timedelta(**kw_)  # type: ignore

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)),
+        (-4.70e9, timedelta(days=-54399, seconds=73600)),
+        (-0.2e-4, timedelta(days=-1, seconds=86399, microseconds=999980)),
+        (-7.6603, timedelta(days=-1, seconds=86392, microseconds=339700)),
     ],
 )
 def test_parse_durations(value, result):