Univariate words X48575

Statement

A word is said to be univariate when all its letters are the same. For instance ’xxx’ is an univariate word. Write a function @has_univariate_word(f)@ that given a list $f$ of nonempty strings of lowercase letters, returns True when $f$ contains an univariate word. The function returns False if $f$ has no univariate words.

Important condition. Solutions employing position-wise indexed access to the argument of the function (as in @f[i]@) are not accepted.

Sample session

>>> has_univariate_word(['xxyxx', 'aaaab', 'ba', 'open', 'close'])
False
>>> has_univariate_word(['car', 'd'])
True
>>> has_univariate_word(['xxx' , 'window'])
True
>>> has_univariate_word([])
False

Information

Author: ProAl
Language: English
Official solutions: Python
User solutions: Python