I have a list containing many alphabets, and I want to replace a random "a" with "b", how can I do it?
alphabets = ["a", "c", "a", "a", "b", "c"]
Examples of wanted output:
["a", "c", "a", "b", "b", "c"]
["b", "c", "a", "a", "b", "c"]
["a", "c", "b", "a", "b", "c"]
I assume that alphabets always has an 'a' and that you always want to change exactly one 'a' to a 'b' at random.
from random import randint
alphabets = ["a", "c", "a", "a", "b", "c"]
# get indices in alphabets associated with the value "a"
indices = [i for i, x in enumerate(alphabets) if x == 'a']
print(f"{'Before':6}: {alphabets}")
# randomly change one of the "a"s to a "b"
alphabets[indices[randint(0, len(indices) - 1)]] = "b"
print(f"{'After':6}: {alphabets}")
Example output:
Before: ['a', 'c', 'a', 'a', 'b', 'c']
After : ['b', 'c', 'a', 'a', 'b', 'c']
