Merge pull request YearOfProgramming#452 from sarcodian/python_12

[Python] Challenge 12 (reviewed and merged)

challenge_12/python/sarcodian/READ.me

@@ -0,0 +1,9 @@
+Two Fuctions:
+
+Compress:
+    Make a new string and append all chars unless same consecutive char, 
+    then store those in a temp variable, if 5 or more then compress.
+
+Decompress:
+    Make a new string and add N instances of y after encountering any instances
+    of y#N

challenge_12/python/sarcodian/src/challenge_12.py

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+def compress():
+    '''
+    Ask for a string input and return a compressed string with all
+    consecutive repetitions for 4 or greater replaced with a representation
+    in the form of y#N.
+    aaaaa -> a#5
+    '''
+
+    orig_string = input("Enter the list to compress: ")
+    temp = ''
+    comp_string = ''
+
+    for i, j in enumerate(orig_string):
+        try:
+            if j != orig_string[i+1]:
+                temp += j
+                if len(temp) > 4:
+                    comp_string += '{}#{}'.format(temp[0], len(temp))
+                    temp = ''
+                else:
+                    comp_string += j
+                    temp = ''
+            else:
+                temp += j
+        except IndexError:
+            if j == orig_string[i-1]:
+                temp += j
+                if len(temp) > 4:
+                    comp_string += '{}#{}'.format(temp[0], len(temp))
+                    temp = ''
+                else:
+                    comp_string += temp
+                    temp = ''
+            else:
+                temp += j
+    if len(temp) > 0:
+        comp_string += temp
+
+    return comp_string
+
+def decompress():
+    '''
+    Ask for a string and expand all instances of #N with the char preceeding it
+    repeated N times.
+    a#5 -> aaaaa
+    '''
+    comp_string = input("Enter string to be decompressed: ")
+    temp = ''
+    orig_string = ''
+
+    for i, j in enumerate(comp_string):
+        if j in '0123456789':
+            pass
+        elif j == '#':
+            num = i+1
+            while comp_string[num] in '0123456789':
+                temp += comp_string[num]
+                num += 1
+            orig_string += comp_string[i-1]*(int(temp)-1)
+            temp = ''
+        else:
+            orig_string += j
+
+    return orig_string

challenge_12/python/sarcodian/src/challenge_12_tests.py

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+# we start by importing the unittest module
+import unittest
+from unittest import mock
+
+# Next lets import our function that we intend to do testing on
+#
+# **We could also import all functions by using * or just import the module
+# itself but for now lets just import the function
+from challenge_12 import compress, decompress
+
+# lets define our suite of tests as a class and lets inherit from unittest.TestCase
+class TestBinaryMethods(unittest.TestCase):
+
+    def test_compress(self):
+
+        test_list = [
+            'aaaaabbbbbcccccdd',
+            'abcdefghhhhhijk',
+            'iasudhaiusdh',
+            'abcccccccccccccccde'
+        ]
+
+        with mock.patch('builtins.input', side_effect=test_list):
+            self.assertEqual(compress(), 'a#5b#5c#5dd')
+            self.assertEqual(compress(), 'abcdefgh#5ijk')
+            self.assertEqual(compress(), 'iasudhaiusdh')
+            self.assertEqual(compress(), 'abc#15de')
+
+    def test_decompress(self):
+
+        test_list = [
+            'a#5b#5c#5dd',
+            'abcdefgh#5ijk',
+            'iasudhaiusdh'
+        ]
+
+        with mock.patch('builtins.input', side_effect=test_list):
+            self.assertEqual(decompress(), 'aaaaabbbbbcccccdd')
+            self.assertEqual(decompress(), 'abcdefghhhhhijk')
+            self.assertEqual(decompress(), 'iasudhaiusdh')
+
+    def test_decompress_with_n_digit_numbers(self):
+
+        test_list = [
+            'abc#15de',
+            'abc#150de'
+        ]
+
+        with mock.patch('builtins.input', side_effect=test_list):
+            self.assertEqual(decompress(), 'abcccccccccccccccde')
+            self.assertEqual(decompress(), 'ab'+('c'*150)+'de')
+
+
+# if the python file is ran by itself run unittest
+# This allows us to import the members of the file without running main if we need to
+if __name__ == '__main__':
+    unittest.main()