Fix ValueError converting negative integers to cardinal in pl, cs, sk

num2words/lang_CS.py

@@ -100,6 +100,8 @@ def setup(self):
 
     def to_cardinal(self, number):
         n = str(number).replace(',', '.')
+        if n.startswith('-'):
+            return '%s %s' % (self.negword.strip(), self.to_cardinal(n[1:]))
         if '.' in n:
             left, right = n.split('.')
             leading_zero_count = len(right) - len(right.lstrip('0'))

num2words/lang_PL.py

@@ -175,6 +175,8 @@ def setup(self):
 
     def to_cardinal(self, number):
         n = str(number).replace(',', '.')
+        if n.startswith('-'):
+            return '%s %s' % (self.negword.strip(), self.to_cardinal(n[1:]))
         if '.' in n:
             left, right = n.split('.')
             leading_zero_count = len(right) - len(right.lstrip('0'))

num2words/lang_SK.py

@@ -96,6 +96,8 @@ def setup(self):
 
     def to_cardinal(self, number):
         n = str(number).replace(',', '.')
+        if n.startswith('-'):
+            return '%s %s' % (self.negword.strip(), self.to_cardinal(n[1:]))
         if '.' in n:
             left, right = n.split('.')
             leading_zero_count = len(right) - len(right.lstrip('0'))

tests/test_cs.py

@@ -72,6 +72,14 @@ def test_cardinal(self):
             "tisíc dvěstě devadesát jedna"
         )
 
+    def test_cardinal_negative(self):
+        self.assertEqual(num2words(-1, lang='cs'), "mínus jedna")
+        self.assertEqual(num2words(-5, lang='cs'), "mínus pět")
+        self.assertEqual(num2words(-123, lang='cs'), "mínus sto dvacet tři")
+        self.assertEqual(num2words(-1000000, lang='cs'), "mínus milion")
+        self.assertEqual(num2words(-5.5, lang='cs'), "mínus pět celá pět")
+        self.assertEqual(num2words(-0.5, lang='cs'), "mínus nula celá pět")
+
     def test_to_ordinal(self):
         # @TODO: implement to_ordinal
         with self.assertRaises(NotImplementedError):

tests/test_pl.py

@@ -92,6 +92,17 @@ def test_cardinal(self):
             "sześć kwintyliardów sto dwa kwintyliony tysiąc siedem"
         )
 
+    def test_cardinal_negative(self):
+        self.assertEqual(num2words(-1, lang='pl'), "minus jeden")
+        self.assertEqual(num2words(-5, lang='pl'), "minus pięć")
+        self.assertEqual(
+            num2words(-123, lang='pl'), "minus sto dwadzieścia trzy")
+        self.assertEqual(num2words(-1000000, lang='pl'), "minus milion")
+        self.assertEqual(
+            num2words(-5.5, lang='pl'), "minus pięć przecinek pięć")
+        self.assertEqual(
+            num2words(-0.5, lang='pl'), "minus zero przecinek pięć")
+
     def test_to_ordinal(self):
         self.assertEqual(num2words(100, lang='pl', to='ordinal'), "setny")
         self.assertEqual(

tests/test_sk.py

@@ -72,6 +72,14 @@ def test_cardinal(self):
             "dvestodvadsaťtisícdvestodeväťdesiatjeden"
         )
 
+    def test_cardinal_negative(self):
+        self.assertEqual(num2words(-1, lang='sk'), "mínus jeden")
+        self.assertEqual(num2words(-5, lang='sk'), "mínus päť")
+        self.assertEqual(num2words(-123, lang='sk'), "mínus stodvadsaťtri")
+        self.assertEqual(num2words(-1000000, lang='sk'), "mínus milión")
+        self.assertEqual(num2words(-5.5, lang='sk'), "mínus päť celých päť")
+        self.assertEqual(num2words(-0.5, lang='sk'), "mínus nula celých päť")
+
     def test_to_ordinal(self):
         # @TODO: implement to_ordinal
         with self.assertRaises(NotImplementedError):