13.lambda a syntax
1.fill in the first part of the filter function with a lambda.the lambda should ensure that only "Python" is returned by the filter.
2.fill the second part of the filter function with languages,the list to filter
languages = ["HTML","Javascript","Python","Ruby"]
print filter(lambda x: x == "Python",languages)
输出 ["Python"]
12.anonymous function
my_list =range(16)
print filter(lambda x: x % 3 == 0,my_list)
输出[0,3,6,9,12,15]
