ztlevi
6/8/2017 - 8:33 PM

str.join(iterable)

str.join(iterable) Return a string which is the concatenation of the strings in the iterable iterable. A TypeError will be raised if there are any non-string values in iterable, including bytes objects. The separator between elements is the string providing this method.

str.join.py
content_copyfile_download
["wrt","wrf","er","ett","rftt"]
chars = set("".join(words))
# chars = {'e', 'f', 't', 'r', 'w'}