sgreen solutions to challenge 287

3 files changed, 98 insertions, 0 deletions

diff --git a/challenge-287/sgreen/python/ch-1.py b/challenge-287/sgreen/python/ch-1.py
new file mode 100755
index 0000000000..54a595cdc6
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+++ b/challenge-287/sgreen/python/ch-1.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+
+import re
+import sys
+
+
+def strong_password(password: str) -> int:
+    """The minimum number of steps required to make the given string very strong password.
+
+    Args:
+        password (str): The supplied password.
+
+    Returns:
+        int: The minimum number of steps required.
+    """
+
+    # Count consecutive characters
+    cons_count = 0
+    for c in re.findall(r'((.)\2{2,})', password):
+        # For every 3 consecutive characters, we need to replace one
+        cons_count += len(c[0]) // 3
+
+    # Additional characters require to make it at least 6 characters
+    char_count = max(0, 6 - len(password))
+
+    # Count the number of missing character types
+    type_count = 0
+    if not re.search(r'[a-z]', password):
+        type_count += 1
+    if not re.search(r'[A-Z]', password):
+        type_count += 1
+    if not re.search(r'[0-9]', password):
+        type_count += 1
+
+    # Since the type change can be covered by one of the other required
+    #  changes, return the maximum of the two
+    return max(cons_count + char_count, type_count)
+
+
+def main():
+    result = strong_password(sys.argv[1])
+    print(result)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/challenge-287/sgreen/python/ch-2.py b/challenge-287/sgreen/python/ch-2.py
new file mode 100755
index 0000000000..87059a0873
--- /dev/null
+++ b/challenge-287/sgreen/python/ch-2.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+
+import re
+import sys
+
+
+def valid_number(s: str) -> bool:
+    """Check if the given string is a valid number.
+
+    Args:
+        s (str): The supplied string.
+
+    Returns:
+        bool: True if the string is a valid number, False otherwise.
+    """
+    return bool(re.search(r'^[+-]?([0-9]+\.?[0-9]*|\.[0-9]+)([eE][+-]?[0-9]+)?$', s))
+
+
+def main():
+    result = valid_number(sys.argv[1])
+    print('true' if result else 'false')
+
+
+if __name__ == '__main__':
+    main()
diff --git a/challenge-287/sgreen/python/test.py b/challenge-287/sgreen/python/test.py
new file mode 100755
index 0000000000..33582047ac
--- /dev/null
+++ b/challenge-287/sgreen/python/test.py
@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+
+import unittest
+ch_1 = __import__('ch-1')
+ch_2 = __import__('ch-2')
+
+
+class TestClass(unittest.TestCase):
+    def test_ch_1(self):
+        self.assertEqual(ch_1.strong_password('a'), 5)
+        self.assertEqual(ch_1.strong_password('aB2'), 3)
+        self.assertEqual(ch_1.strong_password('PaaSW0rd'), 0)
+        self.assertEqual(ch_1.strong_password('Paaasw0rd'), 1)
+        self.assertEqual(ch_1.strong_password('aaaaa'), 2)
+
+    def test_ch_2(self):
+        self.assertTrue(ch_2.valid_number('1'))
+        self.assertFalse(ch_2.valid_number('a'))
+        self.assertFalse(ch_2.valid_number('.'))
+        self.assertFalse(ch_2.valid_number('1.2e4.2'))
+        self.assertTrue(ch_2.valid_number('-1'))
+        self.assertTrue(ch_2.valid_number('+1E-8'))
+        self.assertTrue(ch_2.valid_number('.44'))
+
+
+if __name__ == '__main__':
+    unittest.main()