Merge pull request #10858 from Firedrake/rogerbw-challenge-287

RogerBW solutions for challenge no. 287

1 files changed, 40 insertions, 0 deletions

diff --git a/challenge-287/roger-bell-west/python/ch-2.py b/challenge-287/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..7197f9b4f3
--- /dev/null
+++ b/challenge-287/roger-bell-west/python/ch-2.py
@@ -0,0 +1,40 @@
+#! /usr/bin/python3
+
+import re
+
+def validnumber(a):
+  integer = r"[-+]?[0-9]+";
+  float = r"[-+]?([0-9]+\.[0-9]*|[0-9]*\.[0-9]+)";
+  exponential = "(" + integer + "|" + float + ")[Ee]" + integer;
+  number = "^(" + integer + "|" + float + "|" +exponential + ")$";
+  rx = re.compile(number)
+  if re.match(rx, a):
+    return True
+  return False
+
+import unittest
+
+class TestValidnumber(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(validnumber("1"), True, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(validnumber("a"), False, 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(validnumber("."), False, 'example 3')
+
+  def test_ex4(self):
+    self.assertEqual(validnumber("1.2e4.2"), False, 'example 4')
+
+  def test_ex5(self):
+    self.assertEqual(validnumber("-1."), True, 'example 5')
+
+  def test_ex6(self):
+    self.assertEqual(validnumber("+1E-8"), True, 'example 6')
+
+  def test_ex7(self):
+    self.assertEqual(validnumber(".44"), True, 'example 7')
+
+unittest.main()