You should use one equals on line 10)
@coremaster13979: When using list slicing, you should also use the list's name.
Simply do :
new_word = new_word[1:len(new_word)]
You're supposed to let the program know which list you should slice.
Also, like @antairiya mentioned, you should use " = " othern than " == ".
= -> assingment == -> comparison