def file_line_lengths(f: TextIO) - Dict[int, int]:

def file_line_lengths(f: TextIO) -> Dict[int, int]:

"""Return a dictionary where the keys are the lengths of the lines in the

open file f, and the values are the numbers of lines in the file

that have each length.

Newline characters 'n' should not be included when counting the length of

the string.

words.txt:

hi

there

these

are

words

>>> word_file = open('words.txt')

>>> file_line_lengths(word_file)

{2: 1, 5: 3, 3: 1}

>>> word_file.close()

"""

# Add your code here