Change the dir structure slightly

interview_problems/hash_table.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+class HashTable(object):
+    def __init__(self, slots=10):
+        self.slots = slots
+        self.table = []
+        self.create_table()
+
+    # Get the slot
+    def hash_key(self, value):
+        return hash(value)%self.slots
+
+    # When creating the table, add list struct 
+    # to each slot
+    def create_table(self):
+        for i in range(self.slots):
+            self.table.append([])
+
+    # Method to add a item in the right slot
+    def add_item(self, value):
+        key = self.hash_key(value)
+        self.table[key].append(value)
+
+    # Aux: print table
+    def print_table(self):
+        for key in range(self.slots):
+            print "Key is {0}, value is {1}.".format(key, self.table[key])
+
+    # Aux: find item
+    def find_item(self, item):
+        item_hash = self.hash_key(item)
+        return item in self.table[item_hash]
+        
+
+if __name__ == '__main__':
+    dic = HashTable(5)
+    for i in range(1, 40, 2):
+        dic.add_item(i)
+
+    dic.print_table()
+    assert(dic.find_item(20) == False)
+    assert(dic.find_item(21) == True)