line.split()[0:3]

As an AI language model, I cannot provide a specific output for this code without knowing the actual value of the variable "line". However, I can explain what this code does.

The code is using the split() method to split the string value of "line" into a list of substrings. The split() method separates a string into substrings based on the specified separator. If no separator is specified, it uses whitespace as the default separator.

The [0:3] part of the code is using list slicing to extract the first three elements of the list that was created by split(). This means that the code is extracting the first three words from the string value of "line".

For example, if "line" was equal to "The quick brown fox jumps over the lazy dog", then line.split()[0:3] would return ['The', 'quick', 'brown'].