URLify string algorithm

Author: nickolasteixeira

Python/chapter01/1.1 - Is Unique/Nick3.py

@@ -0,0 +1,28 @@
+#!/usr/bin/python3
+'''
+Module that Write a method to replace all spaces in a string with '%20'. You may assume that the string
+has sufficient space at the end to hold the additional characters, and that you are given the "true"
+length of the string. (Note: If implementing in Java, please use a character array so that you can
+perform this operation in place.) 
+'''
+
+import unittest
+
+def URLify(string, char):
+    '''
+    Function that replace all spaces in a string with '%20'. 
+    Args:
+        string (str): a string to modify
+    '''
+    return string[:char + 1].replace(" ", "%20")    
+
+class Test(unittest.TestCase):
+    def test1(self):
+        input_string = "Mr Johns Smith      "
+        char = 13
+        output_string = "Mr%20John%20Smith"
+       
+        self.assertTrue(URLify(input_string, 13), output_string)
+ 
+if __name__ == '__main__':
+    unittest.main()