Too many memory allocations
You can make output array at start
Cause u know amount of elements len(arr) * len(arr[0])

But very elegant

very elegant

He calls the replace(). Replace accepts something called a regex (which tells your replace method to expect a certain type of string pattern -- in this case the regex is a '.' which ensures your input is any character but a line terminator). The second parameter replace accepts is a callback function. The callback function contains a dictionary of matching DNA values. This function runs on each individual character from the original dna string and 'replaces' it with the matching DNA value from the dictionary.

haha wow, solid and suprisingly readable

i'm not french either, but it's an adapted term for admitting defeat, sure to be in the OED

ah, I'm English, not French ;p

it's French. when a fencing opponent gets you with their épée, you admit their success

touché

@Lurvetti i did a golfed version of this, just for fun
@Steffan153 can you beat it? ;)

Awsome, thanks!

Yes. 'b' * True is 'b' because the integer of True is 1.
And not 0 is True because the boolean of 0 is False, and revert that is True.

So, this means that a (variable times True) = (variable) and that (not 0) = (True)?

That's actually pretty clever.

This is great! :D