GH-124693: Support parsing negative scientific and complex numbers argparse (GH-124823)

Co-authored-by: Serhiy Storchaka <[email protected]>

Author: savannahostrowski

Lib/argparse.py

@@ -1367,7 +1367,7 @@ def __init__(self,
         self._defaults = {}
 
         # determines whether an "option" looks like a negative number
-        self._negative_number_matcher = _re.compile(r'^-(?:\d+(?:_\d+)*(?:\.\d+(?:_\d+)*)?|\.\d+(?:_\d+)*)$')
+        self._negative_number_matcher = _re.compile(r'-\.?\d')
 
         # whether or not there are any optionals that look like negative
         # numbers -- uses a list so it can be shared and edited

Lib/test/test_argparse.py

@@ -2195,20 +2195,33 @@ class TestNegativeNumber(ParserTestCase):
     argument_signatures = [
         Sig('--int', type=int),
         Sig('--float', type=float),
+        Sig('--complex', type=complex),
     ]
     failures = [
         '--float -_.45',
         '--float -1__000.0',
+        '--float -1.0.0',
         '--int -1__000',
+        '--int -1.0',
+        '--complex -1__000.0j',
+        '--complex -1.0jj',
+        '--complex -_.45j',
     ]
     successes = [
-        ('--int -1000 --float -1000.0', NS(int=-1000, float=-1000.0)),
-        ('--int -1_000 --float -1_000.0', NS(int=-1000, float=-1000.0)),
-        ('--int -1_000_000 --float -1_000_000.0', NS(int=-1000000, float=-1000000.0)),
-        ('--float -1_000.0', NS(int=None, float=-1000.0)),
-        ('--float -1_000_000.0_0', NS(int=None, float=-1000000.0)),
-        ('--float -.5', NS(int=None, float=-0.5)),
-        ('--float -.5_000', NS(int=None, float=-0.5)),
+        ('--int -1000 --float -1000.0', NS(int=-1000, float=-1000.0, complex=None)),
+        ('--int -1_000 --float -1_000.0', NS(int=-1000, float=-1000.0, complex=None)),
+        ('--int -1_000_000 --float -1_000_000.0', NS(int=-1000000, float=-1000000.0, complex=None)),
+        ('--float -1_000.0', NS(int=None, float=-1000.0, complex=None)),
+        ('--float -1_000_000.0_0', NS(int=None, float=-1000000.0, complex=None)),
+        ('--float -.5', NS(int=None, float=-0.5, complex=None)),
+        ('--float -.5_000', NS(int=None, float=-0.5, complex=None)),
+        ('--float -1e3', NS(int=None, float=-1000, complex=None)),
+        ('--float -1e-3', NS(int=None, float=-0.001, complex=None)),
+        ('--complex -1j', NS(int=None, float=None, complex=-1j)),
+        ('--complex -1_000j', NS(int=None, float=None, complex=-1000j)),
+        ('--complex -1_000.0j', NS(int=None, float=None, complex=-1000.0j)),
+        ('--complex -1e3j', NS(int=None, float=None, complex=-1000j)),
+        ('--complex -1e-3j', NS(int=None, float=None, complex=-0.001j)),
     ]
 
 class TestInvalidAction(TestCase):

Misc/NEWS.d/next/Library/2024-10-01-02-31-13.gh-issue-124693.qzbXKB.rst

@@ -0,0 +1 @@
+Fix a bug where :mod:`argparse` doesn't recognize negative complex numbers or negative numbers using scientific notation.