diff --git a/PythonTesting/ch5_basic.py b/PythonTesting/ch5_basic.py
index e7b7e5f..5866d3f 100644
--- a/PythonTesting/ch5_basic.py
+++ b/PythonTesting/ch5_basic.py
@@ -50,6 +50,7 @@ def test_with_when(self):
         self.assertAlmostEqual(controller.previous_error, -11.0)
         self.assertAlmostEqual(controller.integrated_error, 0)
 
+class time
 
 class TestCalculateResponse(unittest.TestCase):
     def ignore_test_without_when(self):
diff --git a/mongodb_1.py b/mongodb_1.py
new file mode 100644
index 0000000..9223665
--- /dev/null
+++ b/mongodb_1.py
@@ -0,0 +1,13 @@
+import bottle
+import pymongo
+
+@bottle.route('/')
+def index():
+    connection = pymongo.MongoClient('localhost', 27017)
+    db = connection.test
+    name = db.names
+    item = name.find_one()
+
+    return 'Hello {}!'.format(item['name'])
+
+bottle.run(host='localhost', port=8080)
diff --git a/various/pythonTree.py b/various/pythonTree.py
index e6affe5..5c437c0 100644
--- a/various/pythonTree.py
+++ b/various/pythonTree.py
@@ -1,47 +1,65 @@
-
 import random
 
-class Node:
 
+class Node:
     data = None
-    left =  None
+    left = None
     right = None
 
-    def __init__(self, initialValue):
-        self.data = initialValue
+    def __init__(self, initial_value):
+        self.data = initial_value
 
-    def addNode(self, newNode):
+    def add_node(self, new_node):
         if not self:
-            self = newNode
-        elif newNode.data >= self.data:
+            self = new_node
+        elif new_node.data >= self.data:
             if not self.right:
-                self.right = newNode
+                self.right = new_node
             else:
-                self.right.addNode(newNode)
+                self.right.add_node(new_node)
         else:
             if not self.left:
-                self.left = newNode
+                self.left = new_node
             else:
-                self.left.addNode(newNode)
+                self.left.add_node(new_node)
 
-    def printInorder(self):
+    def print_in_order(self):
         if self.left:
-            self.left.printInorder()
+            self.left.print_in_order()
         if self:
             print str(self.data),
         if self.right:
-            self.right.printInorder()
+            self.right.print_in_order()
+
+    def check_in_order(self, mini, maxi):
+        if self.left:
+            self.left.check_in_order(mini, maxi)
+        if self:
+            print str("data= {} min={} max={}=> {}/{}".format(self.data))
+        if self.right:
+            self.right.check_in_order(mini, maxi)
+
 
 if __name__ == "__main__":
 
     root = Node(0)
 
-    for i in xrange(1,100):
-        value = random.randint(1,1000)
-        root.addNode(Node(value))
+    for i in xrange(1, 10):
+        value = random.randint(1, 1000)
+        root.add_node(Node(value))
         print value,
 
+    root.print_in_order()
+    root.check_in_order(0, 0)
+
     print "\n---"
 
-    root.printInorder()
+    broken = Node(3)
+    broken.left = Node(2)
+    broken.left.left = Node(1)
+    broken.left.right = Node(4)
+    broken.right = Node(5)
+    broken.right.left = Node(6)
 
+    broken.print_in_order()
+    broken.check_in_order(3, 3)
diff --git a/various/test_new.py b/various/test_new.py
new file mode 100644
index 0000000..bcba6e3
--- /dev/null
+++ b/various/test_new.py
@@ -0,0 +1,58 @@
+def permutate(astring):
+    permute("", astring)
+
+def permute(prefix, rest_of_string):
+    if len(rest_of_string)==0:
+        print prefix
+    else:
+        for idx in range(0, len(rest_of_string)):
+            permute(prefix + rest_of_string[idx], rest_of_string[:idx] + rest_of_string[idx+1:])
+
+def smallest_common(arr1, arr2):
+    arr2.sort()
+    found = -1
+    for el in arr2:
+        if el in arr1:
+            found = el
+            break
+    return found
+
+def reversel(sir):
+    lo =0
+    hi = len(sir)-1
+    sir = [c for c in sir]
+    while lo<hi:
+        a = sir[lo]
+        sir[lo] = sir[hi]
+        sir[hi]= a
+        lo += 1
+        hi -= 1
+    a=""
+    for c in sir:
+        a += c
+    return a
+
+
+def binary_search(array, s):
+    if array[0] > s:
+        binary_search(array[0:len(array)/2], s)
+    else:
+        binary_search(array[len(array)/2+1:], s)
+    if len(array) == 1 and array[0] == s:
+        print "bingo"
+        return True
+    else:
+        return False
+
+
+
+if __name__ == "__main__":
+    permutate("ABCD")
+    arr1=[9,8,7,6,5,4]
+    arr2=[54,22,19,6,2,0,33]
+    print smallest_common(arr1, arr2)
+    print ""
+    # _123 / 1 23
+    print reversel("ABCDEF")
+
+    print binary_search([1,2,3,4,5,6,7,8,9], 4)
\ No newline at end of file
diff --git a/various/tests.py b/various/tests.py
new file mode 100644
index 0000000..b87e291
--- /dev/null
+++ b/various/tests.py
@@ -0,0 +1,115 @@
+# exercise 1
+def check_string(input_string):
+    tmp_array = [x for x in input_string]
+    tmp_array.sort()
+    my_str = ""
+    for el in tmp_array:
+        my_str += el
+    return my_str
+def anagram_finder(input_string, compare_string):
+    start_index = 0
+    len_base_str = len(compare_string)
+    while start_index <= len(input_string) - len_base_str:
+        if check_string(input_string[start_index:start_index + len_base_str]) == compare_string:
+            print start_index,
+        start_index += 1
+    print "\n"
+
+#exercise 2
+def display_matrix(matrix):
+    for i in matrix:
+        for j in i:
+            print j,
+        print
+def check_neighbors(i, j, m, n, matrix, chain):
+    # print i, j, m, n
+    if i < 0 or j < 0 or i >= m or j >= n or matrix[i][j] == 0:
+        return
+
+    if matrix[i][j] == 1:
+        matrix[i][j] = 0
+        check_neighbors(i-1, j, m, n, matrix, chain)
+        check_neighbors(i, j-1, m, n, matrix, chain)
+        check_neighbors(i-1, j-1, m, n, matrix, chain)
+        check_neighbors(i+1, j-1, m, n, matrix, chain)
+
+        check_neighbors(i+1, j, m, n, matrix, chain)
+        check_neighbors(i, j+1, m, n, matrix, chain)
+        check_neighbors(i+1, j+1, m, n, matrix, chain)
+        check_neighbors(i-1, j+1, m, n, matrix, chain)
+        chain.append((i, j))
+        return
+def build_paths(i, j, m, n, matrix):
+    chain = []
+    if matrix[i][j] == 1:
+        # matrix[i][j] = 0
+        check_neighbors(i, j, m, n, matrix, chain)
+    if len(chain):
+        chain.reverse()
+        print chain
+def check_chains(matrix, m, n):
+    display_matrix(matrix)
+    print
+
+    for i in range(0, len(matrix)):
+        for j in range(0, len(matrix[i])):
+            build_paths(i, j, m, n, matrix)
+
+#exercise 3
+def number_finder(array_in):
+    #1. Given an array of integers. Segregate all the non-zero numbers at the beginning.
+    # Print the number of non-zero integers and the minimum number of swaps required for these operations.
+    #Eg. : I/p : 1, 0, 0, -6, 2, 0
+    #o/p : Number of non-zero integers : 3
+    #Minimum number of swaps : 2
+    zero_elem = [e for e in array_in if e == 0]
+    no_zeros = len(zero_elem)
+    full_length = len(array_in) - no_zeros
+    # initial phase
+    for el in array_in[::-1]:
+        if el == 0:
+            no_zeros -= 1
+        else:
+            break
+        # if zeros in last
+    updated_zeros = len([e for e in array_in[::-1][:no_zeros] if e == 0])
+    print "Initial - Number of non-zero {} minimum swaps {}".format(full_length, no_zeros - updated_zeros)
+
+
+def swap(i, j, a_array):
+    tmp = a_array[i]
+    a_array[i] = a_array[j]
+    a_array[j] = tmp
+
+#exercise 4
+def all_permutations(a_string):
+    a_array = [e for e in a_string[:]]
+    permute("", a_string)
+
+def permute(pref, stri):
+    if not len(stri):
+        print pref,
+    else:
+        for i in range(0, len(stri)):
+            permute(pref + stri[i], stri[0:i] + stri[i+1:])
+
+def fibo(n):
+    if n == 2 or n==1:
+        return 1
+    else:
+        return fibo(n-1) + fibo(n-2)
+
+
+if __name__ == "__main__":
+    # anagram_finder("BACDGABCDA", "ABCD")
+
+    #matrix = [[1,1,0,0,0], [0,1,0,0,1], [1,0,0,1,1], [0,0,0,0,0], [1,0,1,0,1]]
+    #m=5
+    #n=5
+    #check_chains(matrix, m, n)
+
+    # number_finder([1, 0, 0, -6, 2, 0, 6, 7])
+
+    all_permutations('123')
+
+    pass