10 Advanced Topics in Python

garbled = "IXXX aXXmX aXXXnXoXXXXXtXhXeXXXXrX sXXXXeXcXXXrXeXt mXXeXsXXXsXaXXXXXXgXeX!XX"
message = filter(lambda x: x!="X", garbled)
print message #I am another secret message!

letters = ['A', 'B', 'C', 'D', 'E']
print letters[::-1] #Output: ['E', 'D', 'C', 'B', 'A']