list_filter_and_comprehension

# list_filter_comprehension.py
# python has buitin funtction for list comprehension
""" a function is passed as first argument to  "fiter",and a list as second argument.That function has to take an argument."filter" will return a list containing all the elements for which that function returned true"""


def odd(n):
    return n%2

li=[1,2,3,4,5,6,7,8,9,10,-1,-2]
odd_list = filter(odd,li)
print odd_list

# one line filter
odd_nlist=filter(lambda x : x%2 , li)
print odd_nlist
# the same task can be achieved in other ways also
# using list comprehension
odd_list1=[f for f in li if(odd(f))]
print odd_list1
# using for loop
filtered_list=[]
for n in li:
    if odd(n):
        filtered_list.append(n)

print filtered_list