Selectively replace multiple instances of a character within a string: Difference between revisions
Selectively replace multiple instances of a character within a string (view source)
Revision as of 06:10, 20 July 2022
, 1 year agoPython: alternative
(Selectively replace multiple instances of a character within a string in FreeBASIC) |
(Python: alternative) |
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</lang>
===Alternative===
<lang python>import functools
from typing import Iterable
from typing import Tuple
@functools.cache
def find_nth(s: str, sub: str, n: int) -> int:
assert n >= 1
if n == 1:
return s.find(sub)
return s.find(sub, find_nth(s, sub, n - 1) + 1)
def selective_replace(s: str, ops: Iterable[Tuple[int, str, str]]) -> str:
chars = list(s)
for n, old, new in ops:
chars[find_nth(s, old, n)] = new
return "".join(chars)
print(
selective_replace(
"abracadabra",
[
(1, "a", "A"), # the first 'a' with 'A'
(2, "a", "B"), # the second 'a' with 'B'
(4, "a", "C"), # the fourth 'a' with 'C'
(5, "a", "D"), # the fifth 'a' with 'D'
(1, "b", "E"), # the first 'b' with 'E'
(2, "r", "F"), # the second 'r' with 'F'
],
)
)
</lang>
{{out}}
<pre>
AErBcadCbFD
</pre>
=={{header|Raku}}==
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