Regarding concatenation of a list to a string

[buran]

you cannot add objects of different type - str and list.
by the way, it's better to use advanced string formatting methods, rather than convert the list to str and then using +

warriors = ["Kevin", "Casper", "Nick", "Jim", "Napolean"]
print("The names of these men were: {}".format(', '.join(warriors)))

in python 3.6+ you can also use the f-string syntax.
Advanced formatting will be much more handy when it comes to using different types, e.g. numbers