What will be the output of the following Python code?

YTH

The string 'PYTHON' is stored in the variable str1. Python uses 0-based indexing.

Index Table:

Index	Character
0	P
1	Y
2	T
3	H
4	O
5	N

The slice str1[1:4] selects characters from index 1 to 3 (excluding 4): YTH

Hence, the output is YTH.