Selectively replace multiple instances of a character within a string: Difference between revisions

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 "AErBcadCbFD"
 </pre>
+=={{header|Python}}==
+{{trans|Julia}}
+<lang python>from collections import defaultdict
+rep = {'a' : {1 : 'A', 2 : 'B', 4 : 'C', 5 : 'D'}, 'b' : {1 : 'E'}, 'r' : {2 : 'F'}}
+def trstring(oldstring, repdict):
+    seen, newchars = defaultdict(lambda:1, {}), []
+    for c in oldstring:
+        i = seen[c]
+        newchars.append(repdict[c][i] if c in repdict and i in repdict[c] else c)
+        seen[c] += 1
+    return ''.join(newchars)
+print('abracadabra ->', trstring('abracadabra', rep))
+</lang>
 =={{header|Raku}}==