diff --git a/100+ Python challenging programming exercises.txt b/100+ Python challenging programming exercises.txt
index 66c00215..c6d2236e 100644
--- a/100+ Python challenging programming exercises.txt	
+++ b/100+ Python challenging programming exercises.txt	
@@ -34,6 +34,10 @@ for i in range(2000, 3201):
         l.append(str(i))
 
 print ','.join(l)
+
+another solution using list comprehension:
+l= [i for i in range(2000,3201) if (i%7==0 and i%5 != 0)]
+print ','.join(str(i) for i in l)
 #----------------------------------------#
 
 #----------------------------------------#
@@ -177,7 +181,7 @@ Level 2
 
 Question:
 Write a program which takes 2 digits, X,Y as input and generates a 2-dimensional array. The element value in the i-th row and j-th column of the array should be i*j.
-Note: i=0,1.., X-1; j=0,1,¡­Y-1.
+Note: i=0,1.., X-1; j=0,1,¡­Y-1.
 Example
 Suppose the following inputs are given to the program:
 3,5
@@ -225,7 +229,7 @@ print ','.join(items)
 Question 9
 Level 2
 
-Question£º
+Question£º
 Write a program that accepts sequence of lines as input and prints the lines after making all characters in the sentence capitalized.
 Suppose the following input is supplied to the program:
 Hello world
@@ -425,7 +429,7 @@ Question:
 Write a program that computes the net amount of a bank account based a transaction log from console input. The transaction log format is shown as following:
 D 100
 W 200
-¡­
+¡­
 D means deposit while W means withdrawal.
 Suppose the following input is supplied to the program:
 D 300
@@ -529,7 +533,8 @@ In case of input data being supplied to the question, it should be assumed to be
 We use itemgetter to enable multiple sort keys.
 
 Solutions:
-from operator import itemgetter, attrgetter
+
+from operator import itemgetter, attrgetter   
 
 l = []
 while True:
@@ -568,13 +573,13 @@ for i in reverse(100):
 Question 21
 Level 3
 
-Question£º
+Question£º
 A robot moves in a plane starting from the original point (0,0). The robot can move toward UP, DOWN, LEFT and RIGHT with a given steps. The trace of robot movement is shown as the following:
 UP 5
 DOWN 3
 LEFT 3
 RIGHT 2
-¡­
+¡­
 The numbers after the direction are steps. Please write a program to compute the distance from current position after a sequence of movement and original point. If the distance is a float, then just print the nearest integer.
 Example:
 If the following tuples are given as input to the program:
@@ -1096,7 +1101,7 @@ Use tuple() to generate a tuple from a list.
 Solution
 tp=(1,2,3,4,5,6,7,8,9,10)
 li=list()
-for i in tp:
+for i in range(0,len(tp)):
 	if tp[i]%2==0:
 		li.append(tp[i])
 
diff --git a/README.md b/README.md
new file mode 100644
index 00000000..e821d3a8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+Python-programming-exercises
+============================
+
+100+ Python challenging programming exercises