search for a part of strinf from list in another list !

[snippsat]

can u explain please what is this line do ( if re.search('|'.join(lst_find), item): )

>>> lst_find = ["Facebook" , "gmail" , "Yahoo"]
>>> '|'.join(lst_find)
'Facebook|gmail|Yahoo'

In regex | is or,so it will match Facebook or gmail or Yahoo.

>>> import re
>>> 
>>> s = 'hello gmail from Yahoo.This is Facebook.'
>>> re.findall(r'Facebook|gmail|Yahoo', s)
['gmail', 'Yahoo', 'Facebook']

and why i should use python 3 ?

Python 2 is end of life in a little over a year.
Python 3 is now 10-year old and it fix a lot mistakes that Python 2 had.
Python 2 support is dropped in Django,IPython...ect.
The scientific stack will start drop Python 2 in 2019,like Pandas,Numpy,Matplotlib...ect.

There is lot features that only work in Python 3

>>> s = 'cool'
>>> p = 'Python'
>>> print(f'There is lot of {s} features that only {p} {2 * 1.8}--> has,like <{f:^15}>')
There is lot of cool features that only Python 3.6--> has,like <   f-string    >