24 – Longest word in a string

The built-in max has a keyword parameter key that determines how objects are compared, allowing flexible comparisons.

For example, the idiom max(..., key=len) lets you find the longest item in a collection, namely, the longest word in a string:

s = "These are just some sensational words"
print(
    max(s.split(), key=len)
)  # sensational

The built-ins min and sorted also have this keyword parameter.