why this code is not printing the reverse list!

Question

numbers = list(range(3, 8))
print(numbers)
n = numbers.reverse()
print(n)

Answer 1

took me a bit to figure it out myself! the reason is that list.reverse () does not return a value, but instead reverses the list in place. because there is no return value, the variable n is equal to None. Instead, use the following code:

numbers = list (range (3,8))
print(numbers)
numbers.reverse ()
print (numbers)

note: this changes the list entirely, so if you are accessing the list via indexes using the reverse method will screw that up.

Answer 2

never heard of using .reverse()

reversing positions in a list is done like so:
reverse = list[::-1]

Answer 3

Lists are mutable.
So, numbers.reverse() does not have a return .
It manipulates ths list numbers to whatever you want.

numbers = range(3,8)
print numbers
numbers.reverse()
print numbers

Unlike tuples witch are not mutable, a tuple does not have a reverse method to manipulate like in lists or range.
So if you want to reverse a tuple you should copy its items to something that is mutable like a list or a range.

tuple = (1,2,3,4,5)
list_tuple_items_reversed = []
i = len(tuple)
while i > 0:
list_tuple_items_reversed.append(tuple[i-1])
i -= 1

print list_tuple_items_reversed

Answer 4

thanks Luke.. made it clear now..
thanks vyavas.. I am still in basics and experimenting it..

Answer 5

vyavas and Luke both thanks