Parts of a string can be located based on position and returned. This is because a string is a sequence. Coordinates start at 0. You add the coordinate in square brackets after the string's name.
You can get to any part of a string with the following syntax [start : end : step].
This string 'ATTAAAGGGCCC' is made up of the following sequence of characters, and positions (starting at zero).
...
Let's return the last 3 characters.
sub_dna = dna[-3:]
print(sub_dna)
CCC
When the second argument is left blank and the first argument is negative (-X), X characters from the end of the string are returned.
Reverse a string or a list with object[::-1].
Leave the start and end empty and just use the step as -1.
srobb1
commented
6 years ago
Add this:
Parts of a string can be located based on position and returned. This is because a string is a sequence. Coordinates start at 0. You add the coordinate in square brackets after the string's name.
You can get to any part of a string with the following syntax [start : end : step].
This string 'ATTAAAGGGCCC' is made up of the following sequence of characters, and positions (starting at zero).
...
Let's return the last 3 characters.
Reverse a string or a list with object[::-1].
Leave the start and end empty and just use the step as -1.
For a string: