Easiest way to replace a string using a dictionary of replacements?

Question

Consider..

dict = { 'Спорт':'Досуг', 'russianA':'englishA' }  s = 'Спорт russianA' 

I'd like to replace all dict keys with their respective dict values in s.

Answer 1

Using re:

import re  s = 'Спорт not russianA' d = { 'Спорт':'Досуг', 'russianA':'englishA' }  pattern = re.compile(r'\b(' + '|'.join(d.keys()) + r')\b') result = pattern.sub(lambda x: d[x.group()], s) # Output: 'Досуг not englishA' 

This will match whole words only. If you don't need that, use the pattern:

pattern = re.compile('|'.join(d.keys())) 

Note that in this case you should sort the words descending by length if some of your dictionary entries are substrings of others.

Answer 2

You could use the reduce function:

reduce(lambda x, y: x.replace(y, dict[y]), dict, s)