Appending the same string to a list of strings in Python

Question

I am trying to take one string, and append it to every string contained in a list, and then have a new list with the completed strings. Example:

list = ['foo', 'fob', 'faz', 'funk']
string = 'bar'

*magic*

list2 = ['foobar', 'fobbar', 'fazbar', 'funkbar']

I tried for loops, and an attempt at list comprehension, but it was garbage. As always, any help, much appreciated.

Answer 1

The simplest way to do this is with a list comprehension:

[s + mystring for s in mylist]

Notice that I avoided using builtin names like list because that shadows or hides the builtin names, which is very much not good.

Also, if you do not actually need a list, but just need an iterator, a generator expression can be more efficient (although it does not likely matter on short lists):

(s + mystring for s in mylist)

These are very powerful, flexible, and concise. Every good python programmer should learn to wield them.

Answer 2

list2 = ['%sbar' % (x,) for x in list]

And don't use list as a name; it shadows the built-in type.

Answer 3

new_list = [word_in_list + end_string for word_in_list in old_list]

Using names such as "list" for your variable names is bad since it will overwrite/override the builtins.

Answer 4

my_list = ['foo', 'fob', 'faz', 'funk']
string = 'bar'
my_new_list = [x + string for x in my_list]
print my_new_list

This will print:

['foobar', 'fobbar', 'fazbar', 'funkbar']

Answer 5

I havent found a way to comment on answers till now. So here it is. I support Ignacio Vazquez-Abrams's answer of list2 = ['%sbar' % x for x in list].

Others answers with [string + "bar" for string in list] would work for most of times, but if you accept a more general solution for the simplest case you're - IMHO - following Python Design Principles. There should be preferably one obvious way to do it. %sbar works all the time.