python - Remove some words replace some other words from a txt file -

i have txt file (mytext.txt) containing many lines of text.

i know :

• how create list of word needs deleted (i want set words myself)
• how create list of word needs replaced

for instance if mytext.txt is:

    ancient romans influenced countries , civilizations in following centuries.   language, latin, became basis many other european languages. stayed in roma 3 month.  

• i remove "the" "and" "in" replace "ancient" "old"
• i replace "month" , "centuries" "years"

you use regex:

import re  st='''\ ancient romans influenced countries , civilizations in following centuries.   language, latin, became basis many other european languages. stayed in roma 3 month.'''  deletions=('and','in','the') repl={"ancient": "old", "month":"years", "centuries":"years"}  tgt='|'.join(r'\b{}\b'.format(e) e in deletions) st=re.sub(tgt,'',st) word in repl:     tgt=r'\b{}\b'.format(word)     st=re.sub(tgt,repl[word],st)   print st