🏣 Clean up for arxiv

book/ebook_src/real_interview_problems/palindome.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+import string
+
+def sanitize(sentence):
+        array = sentence.lower()
+        array = array.strip()
+        array = array.strip(string.punctuation)
+        return array
+
+def check_if_palindrome(array):
+        if len(array) < 2:
+            return True
+        
+        if array[0] == array[-1]:
+                return check_if_palindrome(array[1:-1])
+        else:
+            return False
+
+def check_if_palindrome_iter(array):        
+    i, j = 0, len(array)-1
+    
+    while i <= j:
+        if array[i] != array[j]:
+            return False
+        i += 1
+        j -= 1
+        
+    return True
+    
+    
+if __name__ == '__main__':
+    sentence = 'hello there'
+    array = sanitize(sentence)
+    assert(check_if_palindrome(array) == False)
+    assert(check_if_palindrome_iter(array) == False)
+    
+    sentence = ''
+    array = sanitize(sentence)
+    assert(check_if_palindrome(array) == True)
+    assert(check_if_palindrome_iter(array) == True)
+    
+    sentence = 'h'
+    array = sanitize(sentence)
+    assert(check_if_palindrome(array) == True)
+    assert(check_if_palindrome_iter(array) == True)
+    
+    sentence = 'Noel sees Leon'
+    array = sanitize(sentence)
+    assert(check_if_palindrome(array) == True)
+    assert(check_if_palindrome_iter(array) == True)
+        
+    sentence = 'Noel sees Leon!'
+    array = sanitize(sentence)
+    assert(check_if_palindrome(array) == True)
+    assert(check_if_palindrome_iter(array) == True)