[SOLVED] How can I make multiple replacements in a string using a dictionary?

How can I make multiple replacements in a string using a dictionary?

Suppose we have:

d = {
    'Спорт':'Досуг',
    'russianA':'englishA'
}

s = 'Спорт russianA'

How can I replace each appearance within s of any of d's keys, with the corresponding value (in this case, the result would be 'Досуг englishA')?

Solution

Using re:

import re

s = 'Спорт not russianA'
d = {
'Спорт':'Досуг',
'russianA':'englishA'
}
keys = (re.escape(k) for k in d.keys())
pattern = re.compile(r'\b(' + '|'.join(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(re.escape(k) for k in 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.