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  1. import re
  2.  
  3. def strip(s):
  4. 	m = re.match(r'^(-?)(0)*(\d*)$', s)
  5. 	if m is None:
  6. 		return s
  7. 	g1 = '' if m.group(1) is None else m.group(1)
  8. 	g2 = '' if m.group(2) is None else m.group(2)
  9. 	g3 = '' if m.group(3) is None else m.group(3)
  10. 	if not len(g2) and not len(g3):
  11. 		return g1 + ''
  12. 	if len(g2) and not len(g3):
  13. 		return g1 + g2
  14. 	return g1 + g3
  15.  
  16. import unittest
  17.  
  18. class Test(unittest.TestCase):
  19. 	def test(self):
  20. 		self.assertEqual(strip('090'), '90')
  21. 		self.assertEqual(strip('0080'), '80')
  22. 		self.assertEqual(strip('123'), '123')
  23. 		self.assertEqual(strip('0'), '0')
  24. 		self.assertEqual(strip('000'), '0')
  25. 		self.assertEqual(strip(''), '')
  26. 		self.assertEqual(strip('-123'), '-123')
  27. 		self.assertEqual(strip('-01'), '-1')
  28. 		self.assertEqual(strip('-0'), '-0')
  29. 		self.assertEqual(strip('0012'), '12')
  30.  
  31. unittest.main()
  32.  
Success #stdin #stdout #stderr 0.06s 11560KB
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Standard input is empty
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Standard output is empty
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.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK
https://ideone.com/Q5vth7
language:
Python 3 (python  3.9.5)
created:
4 years ago
visibility:
public

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