I have a list, example:
mylist=["a", "b", "end"]
I want to append all values of mylist to a different list (new_list) and also add the string " letter" to each value of the new_list except the last one (value: end)
So far I have a for loop that adds the string "letter" to all values:
new_list = []
for x in my_list:
new_list.append(x + " letter")
which produces:
("a letter", "b letter", "end letter")
I want:
("a letter", "b letter", "end")
This is best achieved with list comprehensions and slicing:
>>> new_list = [s + ' letter' for s in mylist[:-1]] + mylist[-1:]
>>> new_list
['a letter', 'b letter', 'end']
[s + ' letter' if i < len(mylist)-1 else s for i, s in enumerate(mylist)] but equally ugly.We have to skip the last element, use list slices for this; using a list comprehension will also come in handy. Try this:
mylist = ['a', 'b', 'end']
new_list = [x + ' letter' for x in mylist[:-1]] + [mylist[-1]]
It works as expected:
new_list
=> ['a letter', 'b letter', 'end']
You can add " letter" to each of your element in a list except the last one, and then just add the last one.
new_list = [x + " letter" for x in my_list[:-1]] + [my_list[-1]]
'end'? Simply having the list terminate would arguably be much clearer.